Article
Materials Science, Ceramics
Yang Lou, Yang Chen, Zhimu Gu, Qiang Qiu, Chanjuan Shi, Le He, Yingbin Xing, Jinggang Peng, Haiqing Li, Yingbo Chu, Jinyan Li, Nengli Dai
Summary: This study demonstrates the highly efficient and stable photoluminescence properties of Er3+/Yb3+/Zr4+ co-doped BaTiO3 ceramic. The emission intensity of Er3+ in the green region was significantly increased under the optimized Zr4+ concentration, and thermal enhancement of emission at different wavebands was achieved with different Zr4+ concentrations. Additionally, thermal quenching behavior was suppressed by energy transfer and ligand distortion induced by Zr4+.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Ruhul Amin, Koyalsuman Samantaray, Saniya Ayaz, Sachindra N. Sarangi, Indranil Bhaumik, Somaditya Sen
Summary: Polycrystalline Ba0.75Pb0.25Ti1-xFexO3 (0 <= x <= 0.148) (BPTF) ceramics were synthesized using the sol-gel auto combustion method. The structural, vibrational, electrical, and magnetic properties were investigated. The presence of both tetragonal and hexagonal phases was observed, with an increase in the hexagonal phase in higher Fe-doped samples. A relaxor-type phase transition was observed in the high Fe-doped samples. The samples exhibited ferroelectric properties at room temperature, as confirmed by the presence of room-temperature P-E hysteresis loops. Additionally, higher Fe-doped samples showed increased ferromagnetic ordering at room temperature. Therefore, the Fe-doped Ba0.75Pb0.25TiO3 system exhibited multiferroic properties at room temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Qiaoli Liu, Junwei Liu, Yongfu Lian, Meijing Wang, Weihao Wang, Dayong Lu
Summary: The tetragonality and phase-transition temperature of BaTiO3 ceramics doped with rare-earth Sm decreased with increasing doping content. Colossal dielectric constant and dielectric relaxations were observed, attributed to the inhomogeneous structure and interface-polarization effect. The multi-relaxation phenomenon depended on doping content and reflected the complex inhomogeneity of the samples, with relaxation processes closely related to the electrical resistances of the grain and activation energies dependent on the crystal structures.
CERAMICS INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Andreja Bencan, Emad Oveisi, Sina Hashemizadeh, Vignaswaran K. Veerapandiyan, Takuya Hoshina, Tadej Rojac, Marco Deluca, Goran Drazic, Dragan Damjanovic
Summary: Through aberration-corrected scanning transmission electron microscopy and Raman spectroscopy, the authors have identified static polar nanoclusters in the nominally non-polar cubic phases of (Ba,Sr)TiO3 and BaTiO3, shedding light on the understanding of atomic-scale structures of disordered materials and the origin of precursor states in ferroelectrics. These findings have implications for clarifying the dynamic-versus-static nature of nano-sized clusters and addressing long-standing questions in the physics of ferroelectrics.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Marwa M. Hussein, Samia A. Saafan, H. F. Abosheiasha, Anwer S. Abd El-Hameed, Di Zhou, M. M. Salem, Moustafa A. Darwish
Summary: This research comprehensively analyzes the characteristics of Ba0.7Sr0.3TiO3 nanoparticles synthesized using a sol-gel approach, including their structure, electrical properties, and electrodynamic behavior. The study confirms the formation of a tetragonal perovskite phase and nano-crystalline nature through X-ray diffraction analysis. The electrical properties of the nanoparticles have been investigated, revealing a soft electric hysteresis loop with a small coercive field value, making them suitable for photovoltaic applications. Additionally, a compact dielectric resonator antenna based on the nanoparticles has been designed and characterized, showing good impedance matching and high antenna gain and efficiency in the sub-6 GHz frequency band, making it suitable for 5G applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Wan Zhang, Feng Qiu, Yong Li, Rui Zhang, Huan Liu, Lun Li, Jiyang Xie, Wanbiao Hu
Summary: In this study, lattice defects were deliberately introduced in high-dielectric-constant paraelectric cubic BaTiO3 to fabricate MoS2 photodetectors with ultrahigh detection ability and outstanding field-effect traits. An organic-metal-based spincoating cum annealing method was used for material synthesis, with optimized thickness, high dielectric constant, and low dielectric loss, resulting in enhanced visible-light absorption. The synergistically enhanced mobility and photoabsorption in the MoS2/BTO FET demonstrate promising merits for high-performance photodetectors with excellent responsivity and detectivity.
Article
Chemistry, Physical
Nahida Hassan, Mudasir Rashid, Rubiya Samad, Saima Jahan, Basharat Want, Muntazir Gull, Khalid Sultan
Summary: In this study, we synthesized a CoYb0.1Fe1.9O4-BaTiO3 core-shell multiferroic nano-composite using the co-precipitation and sol-gel method. The composite exhibited strong interfacial coupling and reduced leakage current, leading to enhanced energy storage efficiency (60%) and magneto-capacitance (5.853%). The composite also showed moderate values of saturation magnetization (3.379 emu/g) and polarization (5.146 mu C/cm2) along with low remnant polarization (1.777 mu C/cm2) at room temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Inorganic & Nuclear
Fatima Sayed, Deep Chandra Joshi, Ganesh Kotnana, Davide Peddis, Tapati Sarkar, Roland Mathieu
Summary: This study successfully synthesized ferroelectric-ferrimagnetic BaTiO3-CoFe2O4 nanocomposites using low-cost and scalable sol-gel chemistry. The nanocomposites exhibited average crystallite sizes of around 20 nm for the BaTiO3 phase and demonstrated excellent magnetic and dielectric properties.
INORGANICA CHIMICA ACTA
(2021)
Article
Materials Science, Ceramics
Yan Wang, Liangliang Liu, Weixing Zhao, Rong Ma, Jiaojiao Pang, Dengwei Hu, Zhen Dou, Meng Song, Tong Li, Kangkang Miao
Summary: Ferroelectric BaTiO3/ZnO heterojunction catalysts synthesized via the sol-gel method show enhanced Fenton-like catalytic activity, with the optimal BaTiO3:ZnO molar ratio of 1:1 for the degradation of methylene blue dye. The enhancements can be attributed to the formation of semiconductor heterojunctions, improving spontaneous polarization strength and accelerating PMS activation for the degradation of organic pollutants.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
J. Los, A. Drozd-Rzoska, S. J. Rzoska
Summary: The report presents pressure-related broadband dielectric spectroscopy (BDS) studies in liquid crystalline octyloxycyanobiphenyl (8OCB) and its nanocolloid with BaTiO3 paraelectric nanoparticles. It is focused on the low-frequency (LF) domain, and the impact of pretransitional fluctuations. Studies were carried out in isotropic liquid, nematic, Smectic A, and solid crystal phases. In each case, the critical-type behav-ior for the LF contribution to the real part of dielectric permittivity and DC electric conductivity is evidenced. Studies of dielectric constant, related to the static frequency domain, revealed in SmA mesophase the shift from the XY-type to the mean-field type criticality when adding nanoparticles. The 'giant' premelting effect, with the critical-like portrayal, in the solid crystal phase, is also evidenced. Studies are supplemented by the polarizing microscopy insight into all tested phases appearing on com-pressing in 8OCB, and the nanocolloid. Photos show prenematic fluctuations in the isotropic liquid phase, phase transitions, changes within nematic and smectic mesophases on compressing, and the impact of nanoparticles. (c) 2023 Elsevier B.V. All rights reserved.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Multidisciplinary Sciences
Yeseul Yun, Lutz Muehlenbein, David S. Knoche, Andriy Lotnyk, Akash Bhatnagar
Summary: This study presents a strategy to enhance photocurrent by sandwiching ferroelectric BaTiO3 between paraelectric SrTiO3 and CaTiO3 in a superlattice structure, achieving a significant enhancement that can be tuned by the periodicity of the superlattice, attributed to the large dielectric permittivity and lowered bandgap of the materials involved.
Article
Optics
Shenglong Zhang, Tianhao Fei, Tao Cheng, Jia -Yue Yang, Linhua Liu
Summary: This study combines spectroscopic ellipsometry measurements with first-principles calculations to obtain the UV-Vis dielectric functions of perovskite BaTiO3 at temperatures ranging from 300 to 873 K. The main absorption peak in the dielectric function of BaTiO3 decreases in magnitude and redshifts with increasing temperature. The research sheds light on the temperature-dependent optical properties of BaTiO3 and supports its advancement in ferroelectric photovoltaic applications.
Article
Materials Science, Multidisciplinary
Mehjabeen Khan, Jyoti Shukla, Pallavi Saxena, Ashutosh Mishra, Pradeep Sharma
Summary: In this study, multi-phase ceramic composites consisting of barium titanate and rare-earth-doped magnetic spinel ferrite were synthesized and their structure, magnetic properties, and dielectric properties were investigated. The results showed that the rare-earth-doped magnetic spinel ferrite affected the magnetic and dielectric response of barium titanate.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Ahmed Ali, Mansour M. Hassan, G. Goda Mohammed, Hossam Youssef Abdel El-Hamid, Hilmy Awad
Summary: Nano-composites ceramic of (Al2O3/BaTiO3) were successfully fabricated by Sol. Gel. technique. The addition of Al2O3 changed the structure and particle size of BaTiO3, resulting in uniform distribution of nano-sized particles. The infrared, Raman, and UV/Vis spectroscopy revealed distinct peaks and splits for Al2O3/BaTiO3. Moreover, Al2O3 exhibited a significant effect on the dielectric properties of the composites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Physics, Condensed Matter
G. Hassnain Jaffari, Adeel Zafar, Awais Ali
Summary: Intrinsic dielectric relaxations associated with domains in dense single-phase Barium Titanate have been investigated across the entire ferroelectric regime and various polymorphs. Frequency dispersion in dielectric loss has been observed and analyzed in phases exhibiting low symmetry, and relaxation dynamics between consecutive phase transitions have been attributed to the formation and reorientation of ferroelectric sub-domains/domain boundaries. The sensitivity of the system's intrinsic response to ceramic processing and intentional defects incorporation through ionic substitution has also been noted.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Thomas Schulz, Vignaswaran Veerapandiyan, Marco Deluca, Joerg Toepfer
Summary: Bulk ceramic samples of the perovskite series were prepared using the conventional solid-state route, with careful characterization of Bi2O3 raw materials being essential. X-ray diffraction analysis revealed the formation of perovskite main phase, and samples with higher CaZrO3 fraction showed a flattening of permittivity-temperature curves along with low dielectric losses.Samples with x = 0.2 exhibited a temperature stable permittivity of epsilon(r) approximate to 600 with small dielectric losses, qualifying them as suitable high temperature capacitor dielectric materials.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Pharmacology & Pharmacy
Simona Ionita, Daniel Lincu, Raul-Augustin Mitran, Laila Ziko, Nada K. Sedky, Mihaela Deaconu, Ana-Maria Brezoiu, Cristian Matei, Daniela Berger
Summary: Resveratrol, a naturally occurring polyphenol with antioxidant, cardioprotective and anticancer potential, has low aqueous solubility that limits its application. Encapsulation in mesoporous silica matrices and functional modification can increase its dissolution rate. The functionalized mesoporous carriers showed high anticancer activity, highlighting their potential use in cancer treatment.
Article
Materials Science, Multidisciplinary
Joaquin Yus, Juan Antonio Escribano, Antonio Javier Sanchez-Herencia, Carmen Galassi, Begona Ferrari
Summary: In this study, we successfully prepared TiN suspensions for inkjet printing and evaluated the ink properties and jetting process. After sintering, the hardness analysis of the coated discs showed values ranging from 4 to 7 GPa, depending on the grid design.
Article
Nanoscience & Nanotechnology
Leontin Padurariu, Nadejda Horchidan, Cristina Elena Ciomaga, Lavinia Petronela Curecheriu, Vlad Alexandru Lukacs, Radu Stefan Stirbu, George Stoian, Mihaela Botea, Mihaela Florea, Valentin Adrian Maraloiu, Lucian Pintilie, Aurelian Rotaru, Liliana Mitoseriu
Summary: This paper investigates the effect of ferroelectric filler size and clustering on the dielectric properties of 20%BaTiO3-80%PVDF and 20%(2%Ag-98%BaTiO3)-PVDF hybrid nanocomposites. Finite element calculations reveal that fillers with epsilon > 103 do not enhance the permittivity in the composites, and the effective dielectric constant saturates to specific values determined by filler size and clustering. Addition of metallic ultrafine nanoparticles (Ag) increases the permittivity, especially when they are well connected to the ferroelectric particles' surfaces. Experimental dielectric analysis confirms the trends predicted by simulations, with slightly higher permittivity values likely due to changes in polymer phase composition and local inhomogeneity caused by nanofillers and clustering.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Lavinia Curecheriu, Maria Teresa Buscaglia, Vlad Alexandru Lukacs, Leontin Padurariu, Cristina Elena Ciomaga
Summary: The dielectric and electrocaloric properties of Ba0.90Ca0.10TiO3 ceramics were investigated, and the influence of density and grain size on these properties was discussed. The ceramics exhibited good dielectric properties and significant electrocaloric effects. Ba0.90Ca0.10TiO3 ceramics with a density larger than 90% and grain sizes of a few micrometers are suitable materials for electrocaloric devices.
Article
Chemistry, Physical
Damjan Ivekovic, Sunil Kumar, Andrea Gajovic, Tihana Cizmar, Marko Karlusic
Summary: High-energy heavy ion irradiation is an effective method for nanostructuring 2D materials by introducing controlled defects. It is particularly attractive for mass production of graphene nanomembranes, as nanopore size and density can be easily adjusted through ion irradiation parameters. Understanding the mechanisms of nanopore formation due to high-energy heavy ion impact is crucial. In this study, Raman spectroscopy was used to examine the response of bilayer and trilayer graphene to irradiation. Analysis of spectra obtained from various ion beams revealed that damage production efficiency is strongly correlated with nuclear energy loss and the contribution of electronic energy loss to damage formation is minimal.
Article
Chemistry, Physical
Cristina Elena Ciomaga, Lavinia P. P. Curecheriu, Vlad Alexandru Lukacs, Nadejda Horchidan, Florica Doroftei, Renaud Valois, Megane Lheureux, Marie Helene Chambrier, Liliana Mitoseriu
Summary: Lead-free piezoelectric ceramics with nominal composition at morphotropic phase boundary Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCTZ) were prepared by different processing routes and sintered using different techniques. The study showed that the ceramics exhibited diffuse phase transition and ferroelectric switching responses, with the electrocaloric and piezoelectric effects being influenced by the density and poling efficiency.
Article
Pharmacology & Pharmacy
Mihaela Deaconu, Ana-Maria Prelipcean, Ana-Maria Brezoiu, Raul-Augustin Mitran, Gabriela Isopencu, Cristian Matei, Daniela Berger
Summary: This study aimed to design composites for topical application that can prevent and/or assist in bacterial infections and support cell regeneration using natural components. A polyphenolic extract obtained from Salvia officinalis was embedded in functionalized mesoporous silica nanoparticles and distributed into a collagen porous scaffold. The resulting composites exhibited enhanced antibacterial activity and good cytocompatibility, and improved thermal stability of the scaffold.
Article
Chemistry, Multidisciplinary
Yaowei Hu, Matthieu Picher, Marlene Palluel, Nathalie Daro, Eric Freysz, Laurentiu Stoleriu, Cristian Enachescu, Guillaume Chastanet, Florian Banhart
Summary: The unusual expansion dynamics of individual spin crossover nanoparticles were investigated using ultrafast transmission electron microscopy. Upon exposure to nanosecond laser pulses, the particles exhibited significant length oscillations during and after expansion. The observed oscillation period of 50-100 ns was similar to the time required for the particles to transition between low-spin and high-spin states. Monte Carlo calculations incorporating elastic and thermal coupling between molecules within a crystalline spin crossover particle were able to explain the observed length oscillations. The system underwent repeated transitions between the two spin states until relaxation in the high-spin state occurred due to energy dissipation.
Article
Biochemistry & Molecular Biology
Ana-Maria Brezoiu, Mihaela Deaconu, Raul-Augustin Mitran, Ana-Maria Prelipcean, Cristian Matei, Daniela Berger
Summary: Polyphenolic extracts from natural sources have beneficial properties for human health and can be standardized using the design of experiments. A 2(3)-full factorial model was used to optimize the polyphenol extraction from wild bilberry leaves, and the results were validated by high-performance liquid chromatography. The optimized extract showed antimicrobial properties and a synergistic effect of its components.
Article
Materials Science, Multidisciplinary
Florian Mayer, Marco Deluca, Maxim N. Popov
Summary: By conducting large-scale molecular dynamics simulations, we discovered hidden phases in Zr- and Nb-doped barium titanate (BaTiO3). We investigated the formation and stability of these phases under different stimuli and temperatures (20 and 200 K), revealing the compositional dependence of their properties. Our findings demonstrate the potential of lead-free relaxor ferroelectrics for near-room-temperature neuromorphic computing.
Article
Materials Science, Multidisciplinary
Evgeniy Dul'kin, Michael Roth, Floriana Craciun, Carmen Galassi
Summary: 9/65/35 PLZT relaxor was investigated under a biased electric field using the acoustic emission method. It was observed that the temperature at which the dielectric constant reaches its maximum forms a V-shape and is completely within the ergodic phase. Additionally, the threshold electric field was found to be approximately the same as that in PMN-0.24PT and PFN-0.02PT relaxors. The possible explanation for these phenomena is discussed based on the properties of incorporated ions.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Anastasia Railean, Massine Kelai, Amandine Bellec, Vincent Repain, Marie-Laure Boillot, Talal Mallah, Laurentiu Stoleriu, Cristian Enachescu
Summary: In this paper, the electronic and mechanical behavior of a single layer of spin crossover molecules self-organized on a substrate is discussed within a mechanoelastic model framework. The main experimental results are reproduced, and it is shown that a simple model with fixed neighbors on the substrate can lead to unphysical situations. To improve the model, every spin crossover molecule is allowed to change its adsorption site on the substrate at any moment. Different densities of sites on the substrate are used to simulate further experimental observations.
Article
Materials Science, Multidisciplinary
Radu Stefan Stirbu, Liliana Mitoseriu
Summary: The hysteretic character of the electromechanic coupling in porous piezoeceramics was investigated using modeling and analysis to determine the relationships between polarization, strain, and porosity. The study calculated the local electrical and mechanical responses and determined effective dielectric and piezoelectric constants. The results showed a nonlinear decrease in polarization and deformation with porosity and discussed the effects of different polarization states on the effective permittivity and piezoelectric constants.
COMPUTATIONAL MATERIALS SCIENCE
(2024)
Article
Materials Science, Ceramics
Jorge Sanz-Mateo, Marco Deluca, Bernhard Sartory, Federica Benes, Daniel Kiener
Summary: This study compares the conventional wedge polishing method and the FIB-based lift out preparation method for ceramic thin film sample preparation. The results show that both methods can produce samples with comparable quality, although the FIB method has limitations in selecting the visualized area. The findings of this study are important for researchers working on ferroelectric thin films, as it provides an effective and uncomplicated method for TEM sample preparation.
CERAMICS-SWITZERLAND
(2022)
Article
Materials Science, Ceramics
Dan Zhao, Yi Feng, Zhipeng Pi, Fan Zhang
Summary: Phase equilibria in the ZrO2-GdO1.5-TaO2.5 (ZGTO) system were experimentally investigated, and the differences between ZGTO and the existing ZrO2-YO1.5-TaO2.5 (ZYTO) were discussed. The study is useful for thermodynamic assessment of ZGTO and can guide the design of novel thermal barrier coatings materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yutaka Ohya, Wingki Mey Hendra, Chika Takai-Yamashita, Takayuki Ban
Summary: Diffusion couples of rutile and corundum single crystals were prepared and examined to study the solid solution and precipitation of corundum in rutile during cooling. Different precipitation forms of corundum were observed under different cooling conditions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiaming Zhan, Yunfa Guo, Hao Wang
Summary: This study systematically investigates the mechanical behaviors of calcium fluoride in humid environments. The effects of water on the deformation and plastic enhancement of CaF2 under indentation are explored through microindentation experiments, atomic simulations, and Raman spectroscopy measurement.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hangfeng Zhang, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: The relationship between low and high frequency tunabilities in tin substituted barium titanate ceramics was investigated. It was found that there are differences in tunabilities at different frequencies due to the different activities of larger ferroelectric domains and polar nanoclusters.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Kaibiao Xi, Jiacheng Liu, Beibei Song, Huarong Cheng, Yihao Li, Xiaole Yu, Mupeng Zheng, Mankang Zhu, Yudong Hou
Summary: Composite modulation in the superparaelectric state of the BTBZ-CT system is proposed as an effective strategy to achieve both NTCC and excellent energy storage performance in dielectric ceramics. The addition of BZ and CT to BT ferroelectrics can move the SPE state to the normal use temperature zone, resulting in enhanced NTCC characteristics and energy storage performance. Furthermore, intentional precipitation of CT at grain boundaries can refine the grain size, increase the bandgap, and strengthen the local electric field distribution, thereby enhancing the breakdown electric field.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hamed Salimkhani, Lovro Fulanovic, Till Froemling
Summary: The demand for robust multilayer ceramic capacitors with high-temperature and high-power capabilities is increasing rapidly. However, cost-effective production is a challenge. This study investigates the use of Na0.5Bi0.5TiO3-based materials as promising lead-free options. By adding sintering aids, the sintering temperature of Na0.5Bi0.5TiO3-BaTiO3-CaZrO3-BiAlO3 solid solutions was successfully reduced to 975 degrees C, suitable for co-sintering with Cu electrodes without adverse effects on capacitor properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Mingxing Li, Ran Mo, Zeshui Xu, Jie Zhou, Conglin Zhang, Xuefeng Cui, Fang Ye, Laifei Cheng, Ralf Riedel
Summary: Polymer infiltration and pyrolysis is an effective method for preparing ceramic matrix composites. The transformation of polymer to ceramic during the process affects the residual stress and interface behavior in the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yan Kang, Lin Chen, Chang-Jiu Li, Guan-Jun Yang
Summary: A novel abradable seal coating with low hardness and high bonding strength was successfully designed and prepared. This coating has significantly higher abradability and erosion resistance compared to metal-based coatings, and can retain excellent abradability and have a long lifetime during service.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Qingzhong Song, Xiangdong Zha, Ming Gao, Yingche Ma
Summary: This study analyzes the influence of calcia refractory purity on the properties of calcia crucibles. Higher purity calcia results in well-developed grains and improved hydration resistance, leading to better high-temperature strength and thermal shock resistance. In contrast, lower purity calcia crucibles exhibit inferior properties. Therefore, high-purity calcia is considered a potential refractory for manufacturing oxide crucibles.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sehreish Abrar, Faisal Nazeer, Zhuang Ma, Ling Liu, Abdul Malik, Mustafa Kamal, Abdullah G. Al-Sehemi
Summary: To raise the operating temperature of Si-based ceramic matrix composites (CMCs), researchers have applied thermal/environmental barrier coating (T/EBCs) materials, typically rare earth silicates. However, the high thermal conductivity and the mismatch of thermal expansion have been major challenges in developing new materials that can offer thermal insulation and environmental protection to CMCs. In this study, entropy engineering was used to create a multicomponent equi-atomic single-phase pyro silicate with extremely low thermal conductivity and enhanced water vapor corrosion resistance. The research findings show the potential of high entropy disilicates in achieving ultra-low thermal conductivity and low weight loss in corrosive environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zi-bo Niu, Daxin Li, Dechang Jia, Zhihua Yang, Kunpeng Lin, Paolo Colombo, Ralf Riedel, Yu Zhou
Summary: In this study, SiBCN ceramics with a special structure were prepared to improve the oxidation resistance. The effect of the structure on oxidation behavior and kinetics was investigated, revealing that the special structure can effectively inhibit heterogeneous oxidation and enhance the oxide layer composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Melike Donmez, Metehan Erdogan, Cihangir Duran
Summary: The limited densification of CeO2 ceramics was improved by using an anorthite-based glass, resulting in high dielectric constant and quality factor with minimum dielectric loss. The CeO2-(anorthite-based) glass ceramic showed promising results in terms of low temperature densification and microwave properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
S. Rahmati, R. G. A. Veiga, J. Mostaghimi, T. Coyle, A. Dolatabadi
Summary: This study provides an atomic-scale description of the high-velocity impact of alpha-Al2O3 particles onto an alpha-Al2O3 substrate during Aerosol Deposition (AD). The results suggest that the crystal orientation plays a crucial role in both plasticity and damage of the nanoparticles. Impact velocity has a direct correlation with plasticity and fragmentation, but adhesion efficiency has only a marginal increase. The crucial element lies in the substrate's surface alterations caused by the fragments left on the substrate after impact.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Bo-Wen Chen, Yan-Mei Kan, De-Wei Ni, Chun-Jing Liao, Hong-Da Wang, Yu-Sheng Ding, Shao-Ming Dong
Summary: This study characterized the long-term and repeated ablation properties of modified Cf/HfC-SiC composites with YB4-Al2O3-Si3N4 under an air plasma torch. The structural stability and viscosity of the oxide layer were found to affect the ablation resistance of the composites. By forming nano c-HfO2 grains and high-viscosity Al-Si-Y-O glassy phase, the structural stability of the oxide layer was improved, resulting in enhanced ablation resistance. However, the oxidation of Si3N4 led to the formation of NO, NO2, and excessive SiO2 glassy phase, which resulted in a porous structure and reduced the viscosity of the oxide layer. Therefore, the addition of Si3N4 decreased the ablation resistance of the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yongxing Wei, Huawei Zhang, Siyuan Dong, Changqing Jin, Chenxing Bai, Junle Dai, Zengzhe Xi, Zhonghua Dai, Zengyun Jian, Li Jin
Summary: In this study, solid solutions of xBi(Ni1/2Hf1/2)O-3-(1 - x)PbTiO3 (xBNH-PT) were synthesized to investigate their phase boundary behaviors and physical properties. The presence of a tetragonal-pseudocubic phase boundary and a spontaneous ferroelectric-relaxor transition at specific compositions were confirmed. The introduction of a tetragonal-pseudocubic phase boundary improved the piezoelectric properties and suppressed the spontaneous ferroelectric-relaxor transition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
