Article
Materials Science, Multidisciplinary
S. R. Dhanya, Jyotirmayee Satapathy, N. Pavan Kumar
Summary: Neodymium and Chromium codoped bismuth ferrite samples [Bi0.8Nd0.2Fe1-xCrxO3 (x = 0.2,0.4,0.6 and 0.8)] were prepared using solid state reaction method. Structural and morphological characterizations were carried out using XRD, FESEM and Raman techniques. Dielectric studies revealed that lower concentration of dopant exhibited stable results. The correlation between electrical properties, structural and morphological understanding, and the nature and concentration of dopant elements was discussed.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Materials Science, Ceramics
J. N. B. Sales, R. T. da Silva, L. R. S. Lara, S. L. L. M. Ramos, J. S. Soares, T. A. S. Soares, G. Machado, S. M. Manhabosco, A. B. de Oliveira, H. B. de Carvalho, R. J. C. Batista, H. O. Stumpf, T. M. Manhabosco
Summary: Co-, Ni-, and Mn-doped BiFeO3 (BFO) ceramics were synthesized through a solid-state reaction, showing visible-light response. Co- and Ni-doped BFO samples exhibited enhanced ferromagnetic order at room temperature with secondary phases present in minor quantities. Optical spectra revealed two absorption bands and M - H hysteresis loops suggested enhanced ferromagnetism in the Co- and Ni-doped BFO samples.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Adil Alshoaibi, Ikhtiar Hussain Bhellar, Fayaz Hussain, Hareem Zubairi, Sajida Shaikh, Sinan Faouri
Summary: Sr1-xGdxTiO3 (0.00 <= x <= 0.11) ceramics were processed and fabricated by adding Gd3+ on A-sites, and the sintering temperature was optimized at 1390℃-1470℃ for 2 hours. The ceramics exhibited a cubic structure, and the lattice parameters and grain size were affected by the Gd3+ content. Compared to pure SrTiO3 (STO) compounds, the addition of Gd3+ reduced mass loss, increased conductivity and permittivity, and decreased dielectric losses at lower frequencies. The x = 0.03 and 0.01 compositions showed the maximum Seebeck coefficient, confirming higher carrier concentration. The magnetic properties gradually improved with the Gd3+ doping concentration, reaching maximum saturation at the highest concentration of x.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Jae-Young Choi, Youn-Kyung Baek, Jung-Goo Lee, Young-Kuk Kim
Summary: The magnetic properties of aluminum-substituted M-type strontium hexaferrite were improved by NaOH-assisted processing, which promoted phase formation, suppressed formation of non-magnetic phases, developed uniform fine grains, and partially relieved the residual strain caused by aluminum doping.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Ceramics
Anand Kumari, Sujata Sanghi, Ashish Agarwal, Ompal Singh
Summary: Composites of (1-x)BaTiO3- (x)Ba0.9Ca0.1Fe12O19 (x = 0.10, 0.20, 0.30) were synthesized using solid-state reaction technique, showing dual phase symmetry of hexagonal and tetragonal phases. The dielectric constant and magnetic properties increased with an increase in Ca-doped barium ferrite content. The conduction mechanism was found to be best explained by the overlapping large polaron tunneling (OLPT) model.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Wenhao Zhang, Jie Li, Jiawei Li, Jing Guo, Yonglun Wang, Peng Zu, Pengwei Li
Summary: M-type Sr0.7La0.3Zn0.3Fe11.7-xAlxO19 hexaferrites were prepared using the conventional solid state reaction method, showing single magnetoplumbite phase with Al3+ entering the lattice. Different doping levels affected the magnetic, electrical, and structural properties of the hexaferrites.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Muhammad Zahid, Hasan M. Khan, Muhammad Zeewaqar Manzoor, Hafiz Ejaz Ahmed, Tahira Akhter, Thamraa Alshahrani, Muhammad Imran, Mohammed A. Assiri
Summary: Copper-substituted spinel ferrites with nominal composition Ca0.5Ba0.5-xCuxFe2O4 (x = 0.00, 0.125, 0.250, 0.350, 0.500) were successfully prepared by the sol-gel auto combustion route. The structural and electrical behavior of Ca0.5Ba0.5-xCuxFe2O4 nanoparticles were examined through X-ray diffraction (XRD) analysis and dielectric measurements. The addition of Cu2+ cation improved the lattice parameter, dielectric characteristics, and magnetic parameters.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Chemistry, Physical
Shangqing Qu, Jinhao Chen, Jikun Chen, Guohong Cai, Yonggang Wang, Zhongnan Guo, Jing Zhao, Quanlin Liu
Summary: We report the synthesis of a quaternary selenide, In0.5Mn2Bi3.5Se8, which shows good thermal stability and has potential for thermoelectric applications. It exhibits semiconductor properties with electrical conductivity and Seebeck coefficient exceeding 3 S/cm and 300 μV/K at 810 K. This finding enriches our understanding of the pavonite homologous series and provides valuable insights for future exploration in related fields.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Inorganic & Nuclear
V. Ludhiya, N. Hari Kumar, D. Ravinder, Avula Edukondalu
Summary: The cubic spinel ferrites Ni0.3Mg0.5Cu0.2NdxFe2-xO4 (where x = 0.00, 0.02, 0.04, 0.06, 0.08 and 0.1) were synthesized using citric acid assisted auto-combustion technique. X-ray diffraction analysis confirmed the formation of cubic spinel ferrites with decreasing crystallite size. FTIR and FE-SEM analysis supported the results. UV-vis study showed a violet shift and determined direct band gap energy values between 2.59 and 2.44 eV. Dielectric constant, dielectric loss, and impedance studies provided insights into conduction mechanism. The magnetic properties of the prepared samples showed soft ferromagnetic behavior with weakened super exchange interactions upon Nd3+ ion substitution. The materials have potential applications in electronics and electronic devices.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Seung Hyun Jin, Hae Won Lee, Na Won Kim, Byung-Woo Lee, Gil-Geun Lee, Youn-Woo Hong, Woo Hyun Nam, Young Soo Lim
Summary: This study demonstrates the sonochemically activated solid-state synthesis of BaTiO3 powders, which accelerates the phase conversion process and can replace traditional ball-mill mixing methods.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Vidushi Karol, Chandra Prakash, Anshu Sharma
Summary: In this study, the influence of magnesium substitution on Ba0.95-xSr0.05MgxTiO3 was investigated, leading to an improvement in the dielectric loss which is significant for potential applications.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Ceramics
Seong Hyeok Choi, Yoon-Seok Lee, Hun Kwak, Hyeon Jin Jung, Minkee Kim, Seungchan Cho, Jun Hyeon Yoon, Ji Woo Choi, Min Seong Kim, Ji Hyeon Kim, Ilguk Jo, Yangdo Kim, Moonhee Choi
Summary: In this study, solid-state BaTiO3 was successfully synthesized and the factors affecting its properties were identified. Changes in the dielectric constants of sintered specimens were studied to determine the relationship between disintegration conditions, synthetic powders, and sintered specimens. Optimal conditions for uniform solid-state synthesis of BaTiO3 powder were derived for multilayer ceramic capacitor production.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2022)
Article
Chemistry, Multidisciplinary
Tim Fricke, Stefan G. Ebbinghaus
Summary: Single crystals of Ba1-xSrxFe12O19 with different Sr doping levels were successfully grown using a Na2CO3 flux. The crystals had a hexagonal plate-like structure and exhibited pronounced (thermo)mechanical anisotropy and magnetic anisotropy.
Article
Materials Science, Multidisciplinary
A. Rajeshwari, I. Kartharinal Punithavathy, S. Johnson Jeyakumar, M. Jothibas
Summary: Gadolinium-doped manganese nano ferrites were synthesized using a sol-gel method for microwave absorbers and storage devices. XRD analysis showed a well crystalline cubic phase with smaller crystallite size in Gd-doped nanoferrites. The morphology was spherical with less agglomeration, and the bandgap was influenced by the dopant-driven synergistic effect. The magnetic hysteresis curves demonstrated a soft ferromagnetic nature with increasing coercivity and decreasing saturation. Gd co-doping altered the resistance of grain and grain boundaries, and better dielectric characteristics were observed with increasing Gd3+ concentration at higher AC frequencies (voltages). The lowest dielectric loss of 1.8542 and the highest dielectric constant of about 1574426.14 were observed for manganese nano ferrites influenced by Gd3+ ion.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Xiubin Zhao, Shuang Zhang, Jinsong Li, Ailin Xia, Yujie Yang
Summary: M-type Sr0.1Ca0.4La0.5Fe12O19 powder specimens doped with different precursors RFe2O4 (R = Co, Ni, Cu, Zn, and Mg) were prepared via a traditional solid-state reaction method. The structural and magnetic properties of the specimens were studied. The single magnetoplumbite phase was observed in all specimens, with uniformly distributed particles. The specimen with Zn-type precursor exhibited the highest saturation (M-s), while the specimen with Co-type precursor showed the highest remanent magnetism (M-r), coercivity (H-c), and overall magnetic properties.
Article
Chemistry, Analytical
Darja Lisjak, Masa Vozlic, Uliana Kostiv, Daniel Horak, Boris Majaron, Slavko Kralj, Irena Zajc, Lovro Ziberna, Maja Ponikvar-Svet
Summary: The increasing interest in upconverting nanoparticles (UCNPs) in biodiagnostics and therapy has led to the development of biocompatible UCNPs platforms. This study investigated the effect of different phosphonate coatings on the chemical stability and cytotoxicity of Yb3+, Er3+-codoped NaYF4 UCNPs. The results showed that phosphonate coatings prepared at 80 degrees C significantly improved the chemical stability of UCNPs and reduced their cytotoxicity.
METHODS AND APPLICATIONS IN FLUORESCENCE
(2022)
Article
Physics, Applied
S. Bahamida, A. Fnidiki, M. Coisson, E. S. Olivetti, G. Barrera, F. Celegato, P. Tiberto, M. Boudissa
Summary: The kinetics of the transformation from the disordered to the ordered phase in Fe56Pd44 thin films were studied. It was found that the transformation reached completion after 20 minutes of annealing time, with the grain size growing exponentially. The resulting film had a high density of defects, which were linearly related to the average order parameter of the alloy. The evolution of the transformed phase followed Avrami's law with an exponent of 0.4, indicating nucleation-controlled transformation without grain growth.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Patrizio Ansalone, E. S. Olivetti, A. Magni, A. Sola, V. Basso
Summary: This paper uses a non-abelian gauge theory to establish the connection between a chiral crystal structure and the bulk magnetic DMI energy term, focusing on the B20 chiral compounds and deriving the corresponding isotropic Lifshitz invariant within this framework.
Article
Chemistry, Multidisciplinary
Jelena Papan Djanis, Grisa Grigorij Princic, Andraz Mavric, Alenka Mertelj, Jernej Iskra, Darja Lisjak
Summary: This study aimed to amino-functionalize the surfaces of barium hexaferrite nanoplatelets (NPLs) in order to achieve new materials and applications. Two different amine ligands were selected, and the effect of anchoring group, backbone structure, and processing conditions on the formation of surface coatings was studied. The results demonstrated that efficient amino-functionalization can be achieved by using two different methods.
Article
Chemistry, Physical
Ziga Gregorin, Nerea Sebastian, Natan Osterman, Patricija Hribar Bostjancic, Darja Lisjak, Alenka Mertelj
Summary: Ferrofluids are colloidal suspensions of magnetic nanoparticles that exhibit ferromagnetic ordering at specific concentrations. By optimizing fundamental interactions, the threshold concentration for nematic ordering can be reduced, allowing reproducible and controllable analysis of magnetic domain structures. The effect of an external magnetic field on the fluctuations of the nematic director inside a domain has also been studied.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Optics
Vedran Budinski, Simon Pevec, Stanislav Campelj, Alenka Mertelj, Darja Lisjak, Denis Donlagic
Summary: This Letter describes a miniature Fabry-Perot, contactless, magneto-optic sensor for angular position measurement, which utilizes a magneto-optic fluid and a compact fiber-optic sensor system. An efficient temperature compensation system is provided. Experimental results demonstrate an unambiguous measurement range of 90 degrees and a resolution better than 0.05 degrees.
Article
Multidisciplinary Sciences
Gajanan Pradhan, Federica Celegato, Gabriele Barrera, Elena Sonia Olivetti, Marco Coisson, Jan Hajducek, Jon Ander Arregi, Ladislav Celko, Vojtech Uhlir, Paola Rizzi, Paola Tiberto
Summary: Flexible materials have ushered in a new era of application-based research in stretchable electronics and wearable devices. The tuning of magnetic properties by changing the curvature of devices has significant impact in the new generation of sensor-based technologies. In this study, magnetostrictive FeGa thin films were deposited on a flexible Kapton sheet to exploit the magneto-elastic coupling effect and modify the magnetic properties of the sample.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
Marco Coisson, Kouassi Dakmak N'Dri, Lindor Diallo, Elena S. Olivetti, Luca Martino, Carlo P. Sasso, Federica Celegato, Gabriele Barrera, Massimo Pasquale, Paola Rizzi, Mery Malandrino, Olha Nakonechna, Fabien Cuvilly, Paola Tiberto, Jean Juraszek, Saida Bahamida, Abdeslem Fnidiki
Summary: Through the synergy of multiple characterization techniques, a deep understanding of the structure-property relationships in Fe-Ga alloys before and after annealing has been achieved. It was found that the D03 phase is gradually replaced by the A2 phase during annealing, and the A2 phase is responsible for the characteristic magnetic structure and significant improvement in magnetostriction performance.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Biophysics
Jelena Papan Djanis, Jovana Perisa, Patricija Hribar Bostjancic, Katarina Mihajlovski, Vesna Lazic, Miroslav Dramicanin, Darja Lisjak
Summary: Colloidal stabilization is crucial for the preparation of magnetic nanoparticles for biomedical applications. In this study, tannic acid was used as a coating for barium hexaferrite nanoplatelets (BSHF NPLs) to achieve stability in aqueous media. The coated BSHF NPLs were characterized and their magnetic properties were measured. The stable colloids were tested in biological media, and the antimicrobial properties were examined. To enhance antimicrobial activity, tannic acid was used as a platform for the in-situ production of silver on BSHF NPLs. The hybrid material exhibited magnetic properties and excellent antimicrobial activity against Escherichia coli and Staphylococcus aureus.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2023)
Article
Nanoscience & Nanotechnology
A. Sola, E. S. Olivetti, L. Martino, V. Basso
Summary: In order to evaluate the potential of polycrystalline MnBi as a transverse thermoelectric material, we conducted experimental investigations of its anomalous Nernst effect (ANE) using the heat flux method. By employing powder metallurgy, we prepared MnBi samples that can be shaped as desired and their magnetic properties can be tailored. In the sample with the highest remanent magnetization, we measured an ANE thermopower of -1.1 mu V/K at 1 T, after compensating for the ordinary Nernst effect caused by pure bismuth present in the polycrystalline sample. This value is comparable to those reported for single crystals in the literature.
Article
Chemistry, Multidisciplinary
Stanislav Campelj, Matic Pobreznik, Tomas Landovsky, Janez Kovac, Layla Martin-Samos, Vera Hamplova, Darja Lisjak
Summary: In this study, MNPs were successfully functionalized with CAT, GAL, CAF, and NDA at different pH values. The functionalized MNPs showed higher saturation magnetizations (M-s) compared to the starting material. XPS analyses confirmed the presence of Fe(III) ions on the surface, ruling out the formation of magnetite. DFT calculations demonstrated that the adsorption of catechols did not affect the M-s. The increase in the average size of the MNPs and the decrease in the fraction of the smallest MNPs explained the observed increase in M-s values.
Article
Chemistry, Physical
Hajnalka Nadasi, Melvin Kuester, Alenka Mertelj, Nerea Sebastian, Patricija Hribar Bostjancic, Darja Lisjak, Thilo Viereck, Margaret Rosenberg, Alexey O. Ivanov, Sofia S. Kantorovich, Alexey Eremin, Frank Ludwig
Summary: The study investigates the influence of electrostatic interactions on the dynamical response in dispersions of magnetic nanoplatelets, and finds that tuning the interactions with an ionic surfactant leads to new dynamic modes in magnetic response spectra. The collective modes can be induced or suppressed by varying the concentration ratio of the nanoplatelets to the surfactant or increasing the nanoplatelet concentration, reflecting the nanoscale characteristics of this fluid magnet.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Computer Science, Information Systems
Nicoleta Banu, Enzo Ferrara, Massimo Pasquale, Fausto Fiorillo, Olivier de la Barriere, Daniel Brunt, Adam Wilson, Stuart Harmon
Summary: This study investigates the temperature dependence of energy loss in Fe-Co-V sheets. Results show that energy loss reaches a minimum value at room temperature and is most significant under quasi-static conditions. The changes in internal stress due to temperature are identified as the main factor affecting energy loss. At high frequencies, the skin effect leads to non-uniform induction and impacts AC properties.
Article
Engineering, Mechanical
Federica Amenta, Giovanni Bolelli, Stefano De Lorenzis, Alessandro Bertarini, Luca Lusvarghi
Summary: In this study, the tribological response of two polymeric materials against differently coated surfaces was tested, and the wear mechanism of each coupling was identified. The results showed that a PTFE based material, reinforced with glass fibers and a solid lubricant, offered better overall performance than unreinforced polyketone. While the behavior of the PTFE matrix composite was generally worse, it could be used without reinforcing fillers. The formation of a transfer-film on the counter-surfaces was found to be important in preventing further wear of the polymer, but had opposing effects on the friction coefficient for the two materials.
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)
