Article
Chemistry, Multidisciplinary
Yuji Noguchi, Hiroki Matsuo
Summary: The superlattice consisting of Mn(5%)-doped BiFeO3 and BaTiO3 layers grown on SrTiO3 substrates shows different behaviors based on the number of unit cells in the layers. Superlattices with fewer than 5 unit cells behave as a unified ferroelectric, while those with more than 25 unit cells behave as a simple series connection of individual capacitors. Density functional theory calculations explain the spontaneous polarization behavior in these thin superlattices and suggest the potential for novel ferroelectrics with different crystal symmetries.
Article
Materials Science, Ceramics
Hidetoshi Miyazaki, Yosuke Yamashita, Takeshi Tsuji, Wenchang Yeh, Shinya Tsukada
Summary: SiO2-coated BaTiO3 (BT) powder was used to prepare BT films on Au/stainless steel substrates by pulsed electrophoretic deposition. The BT films were sintered with a semiconductor laser and showed improved dielectric and ferroelectric properties. Laser irradiation promoted the sintering of the BT film and reduced its thickness, resulting in increased remanent polarization and coercive field.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Meenal Chauhan, Ekta Arya, Anand Kumari, Sujata Sanghi, Ashish Agarwal
Summary: Multiferroics with composition yNiFe2O4 -(1-y) BaTiO3(y = 0.10, 0.30, and 0.50) were prepared through solid-state reaction. The crystal structure and phase purity of the samples were investigated using X-ray diffraction (XRD) analysis. Rietveld refinement confirmed the presence of cubic (Fd3m) and tetragonal (P4mm) symmetries in all samples. The effect of ferrite (NFO) concentration on magnetic, dielectric, ME coefficient, and ferroelectric properties was further studied. The highest magnetoelectric response was observed in the sample 0.10NiFe2O4-0.90BaTiO3. The coercive field and remnant polarization increased with an increment in ferrite content at room temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Branimir Bajac, Jelena Vukmirovic, Natasa Samardzic, Juras Banys, Goran Stojanovic, Jelena Bobic, Vladimir V. Srdic
Summary: In this study, lead-free multilayer structures composed of perovskite BaTiO3 and spinel NiFe2O4 thin layers were obtained using a solution deposition method. The results showed well-defined layered structure, nanometer-scale grains, and crystalline nature of the thin films. The dielectric properties of the multilayer BaTiO3/NiFe2O4 thin films were influenced by temperature and frequency, and the introduction of the ferrite layer reduced dielectric response and increased low frequency permittivity dispersion.
CERAMICS INTERNATIONAL
(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
Materials Science, Ceramics
V. A. Lukacs, G. Caruntu, O. Condurache, C. E. Ciomaga, L. P. Curecheriu, L. Padurariu, M. Ignat, M. Airimioaei, G. Stoian, A. Rotaru, L. Mitoseriu
Summary: This study presents the preparation and properties of BaTiO3 nanostructured ceramics with porosity levels close to the percolation limit. The ceramics exhibited nanosized grains and multiscale porosity, leading to unique dielectric properties and a potential for gas sensing applications. Preliminary qualitative tests with acetone vapours showed promising responses from the ceramics, indicating potential for gas sensing mechanisms at the interface.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Zhiyu Ma, Weijia Guo, Zhenxing Yue
Summary: TiO2 addition in BSNTA ceramics improves the dielectric constant and temperature coefficient of resonant frequency. Sintering in oxygen enhances the density, dielectric constant, and Q x f value due to the reduction in defect concentration. The research provides new insight into the impact of sintering atmosphere on the Q x f value of titanate ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Hyeon-Min Yu, Su-Hwan Go, Seok-June Chae, Yeon-Gyeong Chae, Eun-Ji Kim, Jae-Min Eum, Hyun Ryu, Sahn Nahm
Summary: A ceramic with a large dielectric constant for X8R MLCC was fabricated by sintering 0.96BT-0.04BMT + y wt.% Nb2O5 ceramics at 1275℃, forming a core-shell structure. The addition of Nb2O5 resulted in a broad shell-region phase-transition peak and a decreased Er of the core-region phase-transition peak, leading to a large Er of 2285 and good temperature stability for the sample with y = 1.25. By using 0.1 wt% BaO-CaO-SiO2 to reduce the sintering temperature, a 9-layered MLCC produced with BCS-doped 0.96BT-0.04BMT + 1.25 wt% Nb2O5 ceramic at 1200℃ showed a large capacitance of 67 nF and complied with EIA-X8R regulations.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Chunyan Zhang, Jin Miao, Zhenhua Wang, Gengtao Yang, Xinhui Liu, Rongli Gao, Xiang Lei
Summary: A new method of preparing magnetoelectric composite ceramics was used, and the structure and properties were studied. The results showed that with increasing ferromagnetic phase content, the compactness of the ceramics improved, but the dielectric and ferroelectric properties decreased.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Review
Materials Science, Ceramics
Zechao Li, Jiacheng Yu, Shenglan Hao, Pierre-Eymeric Janolin
Summary: The substitution of aliovalent elements at either the A- or B-site of ferroelectric perovskites has a significant impact on their properties. Donor doping leads to softening of ferroelectrics, while acceptor doping results in hardening. This review focuses on doped-BaTiO3, a lead-free ferroelectric model, and examines the effects of aliovalent doping on its dielectric, ferroelectric, and piezoelectric properties, using Cu (acceptor) doping as an example.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Xiaobing Yan, Hongwei Yan, Gongjie Liu, Jianhui Zhao, Zhen Zhao, Hong Wang, Haidong He, Mengmeng Hao, Zhaohua Li, Lei Wang, Wei Wang, Zixuan Jian, Jiaxin Li, Jingsheng Chen
Summary: This study presents a silicon-based epitaxial ferroelectric memristor with high temperature stability and good durability, which can simulate artificial synaptic behavior and achieve digital recognition.
Article
Materials Science, Multidisciplinary
Anju Kumari, Kavita Kumari, Faheem Ahmed, Adil Alshoaibi, P. A. Alvi, Saurabh Dalela, Mohamad M. Ahmad, Rezq Naji Aljawfi, Piyush Dua, Ankush Vij, Shalendra Kumar
Summary: In this study, the properties of Sm-doped BaTiO3 ceramics were investigated, revealing enhanced spontaneous polarization, high dielectric constant, and semiconductor nature for the Sm-BTO samples, which can be utilized in visible range photon harvesting devices. The magnetic measurements also suggested ferromagnetic ordering at room temperature. Overall, the findings indicate that the properties of BTO ferroelectric ceramic can be modulated through Sm doping.
Article
Chemistry, Physical
Manisha Kumari, Nitish Baraik, P. M. Sarun
Summary: The study investigates the effects of Nd doping on the microstructural, optical, and dielectric properties of BaTi0.95Sn0.05O3, showing that minor Nd doping can enhance dielectric response, reduce dielectric loss, and lead to a transition from normal ferroelectrics to relaxor-like ferroelectrics.
JOURNAL OF ALLOYS AND COMPOUNDS
(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
Engineering, Electrical & Electronic
Qi Liu, Haipeng Feng, Tianyu Li, Guangao Liu, Yao Feng, Cong Zhou
Summary: In this study, lead-free ceramics (1-x)BaTiO3-xBi(Mg3/4W1/4)O-3 [(1-x)BT-xBMW] were prepared via solid-state reaction method. X-ray patterns showed that the ceramics had perovskite structure without a second phase, and the tetragonal phase of BT transformed into a pseudo-cubic phase with the introduction of BMW. The average grain size of the ceramics decreased from 3.75 μm to 2.54 μm with the increase of BMW content, but increased to 2.83 μm at x = 20. Modification with appropriate amount of BMW improved the relaxation behavior and energy-storage performance of BT ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Ceramics
Nadejda Horchidan, Leontin Padurariu, Cristina E. Ciomaga, Lavinia Curecheriu, Mirela Airimioaei, Florica Doroftei, Florin Tufescu, Liliana Mitoseriu
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Chemistry, Physical
Mirela Airimioaei, Vlad A. Lukacs, Isabelle Lisiecki, Patricia Beaunier, Juliette Blanchard, Doina Lutic, Sorin Tascu, Petronel Postolache, Cristina E. Ciomaga, Marius Olariu, Liliana Mitoseriu
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Chemistry, Physical
Lavinia Curecheriu, Vlad Alexandru Lukacs, Leontin Padurariu, George Stoian, Cristina Elena Ciomaga
Article
Polymer Science
Elisabetta Brunengo, Lucia Conzatti, Ilaria Schizzi, Maria Teresa Buscaglia, Giovanna Canu, Lavinia Curecheriu, Chiara Costa, Maila Castellano, Liliana Mitoseriu, Paola Stagnaro, Vincenzo Buscaglia
Summary: Composites of PVDF and BaTiO3 nanoparticles fabricated through melt blending and compression molding exhibit improved dielectric properties, with increased permittivity and lower dielectric losses. Processing parameters play a key role in optimizing material performance.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Acoustics
Nadejda Horchidan, Lavinia Curecheriu, Cristina E. Ciomaga, Nicoleta Lupu, Liliana Mitoseriu
Summary: In the x BaGeO3-(1 - x)BaTiO3 ceramics, with Ge content below 0.10, the materials exhibit similar dielectric properties to BaTiO3 ceramics. However, increasing Ge content can enhance relative density and grain size, improving electrical properties, but may lead to loss of switching characteristics.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2021)
Article
Polymer Science
Carmen Racles, Mihai Asandulesa, Vasile Tiron, Codrin Tugui, Nicoleta Vornicu, Bianca-Iulia Ciubotaru, Matej Micusik, Maria Omastova, Ana-Lavinia Vasiliu, Cristina Ciomaga
Summary: PDMS-based soft elastic composites containing polysulfone-supported silver nanoparticles (Ag@PSF) were synthesized and investigated for their tunable mechanical properties, electrical actuation behavior, antibacterial/antifungal activity, low bioadhesion, and piezoelectricity. The composites showed a synergistic effect of the fillers' components, making them potential candidates for applications in biomedical field such as actuators, sensors, or micro/nanogenerators.
Article
Materials Science, Ceramics
Cristina Elena Ciomaga, Nadejda Horchidan, Leontin Padurariu, Radu Stefan Stirbu, Vasile Tiron, Florin Mihai Tufescu, Ionut Topala, Oana Condurache, Mihaela Botea, Ioana Pintilie, Lucian Pintilie, Aurelian Rotaru, Gabriel Caruntu, Liliana Mitoseriu
Summary: Flexible composites containing BaTiO3 nanoparticles into Gelatin bio-polymer matrix were designed and investigated. The experimental results showed that the addition of high-permittivity nanofillers significantly increased the permittivity and piezoelectric coefficient of the composites. The simulations also demonstrated that the composite with embedded BaTiO3 nanoparticles exhibited a better mechanical harvesting response.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
V. A. Lukacs, M. Airimioaei, L. Padurariu, L. P. Curecheriu, C. E. Ciomaga, A. Bencan, G. Drazic, M. Avakian, J. L. Jones, G. Stoian, M. Deluca, R. Brunner, A. Rotaru, L. Mitoseriu
Summary: The functional properties of BaTiO3 ceramics with different grain sizes (ranging from 75 nm to 2.25 μm) and polymorph coexistence around room temperature are studied. The research finds that there is a large temperature range of phase coexistence, but the extension of the coexistence domain does not show a significant size effect. However, the transition temperatures vary with grain size. The permittivity values of these ceramics are among the highest reported, with the typical maximum around 1 μm grain size.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Nadejda Horchidan, Cristina Elena Ciomaga, Lavinia Petronela Curecheriu, George Stoian, Mihaela Botea, Mihaela Florea, Valentin Adrian Maraloiu, Lucian Pintilie, Florin Mihai Tufescu, Vasile Tiron, Aurelian Rotaru, Liliana Mitoseriu
Summary: The role of Ag addition in the structural, dielectric, and mechanical harvesting response of flexible composites is investigated. The presence of filler enhances the permittivity, and the addition of Ag further increases the permittivity. The metallic addition is also beneficial for the mechanical harvesting ability of the composites.
Article
Chemistry, Physical
Radu Stefan Stirbu, Leontin Padurariu, Fereshteh Falah Chamasemani, Roland Brunner, Liliana Mitoseriu
Summary: This paper investigates the microstructure features of soft additives used for producing porous ceramics and the formation mechanism of their anisotropic properties. It is found that equiaxed soft polymeric additives can result in anisotropic porosity in ceramics due to the deformation during the pressing step. Analytical and numerical calculations show that uniaxial pressing of solid particles with contrasting mechanical properties generates modifications in the shape of the soft phase, leading to anisotropic shape distribution of the soft inclusions in the green ceramic body and elongated porosity in the final ceramic product.
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
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
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
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)
