Article
Materials Science, Ceramics
Xuefei Wang, Yuxin Fan, Guoqiang Luo, Rong Tu, Qiang Shen, Lianmeng Zhang
Summary: With the increasing application rate of multilayer ceramic capacitors (MLCCs) in small electronic devices, there is a need for the use of barium titanate (BaTiO3) raw material with small particle size and excellent dielectric properties. In this study, small cubic phase Y-doped BaTiO3 (BYT) nanoparticles were prepared using a hydrothermal method, and highly dielectric tetragonal phase BYT ceramics were prepared based on this method. The results demonstrate that the 50 nm cubic phase BaTiO3 powder can meet the needs of next-generation high-capacity MLCCs, providing a reference for small cubic phase BaTiO3 as a dielectric material for high-capacity MLCCs.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Ke Meng, Wenhua Li, Yansong Zhang, Siyuan Zhang, Xingui Tang, Xiaobin Guo, Yanping Jiang
Summary: Ba0.955La0.03TiO3-doped Zr ferroelectric ceramics were prepared by solid-state reaction method, and the experimental results confirmed the adjustable thermal stability of these ceramics. Various characterization methods demonstrated the good crystallization and electrical properties of the ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Ceramics
S. A. N. Franca Junior, W. Acchar, S. L. A. Dantas, P. H. Chiberio, H. P. A. Alves, M. R. D. Bomio, F. V. Motta, F. Bohn, A. Ferreira, F. Vaz, M. A. Correa
Summary: We conducted a comprehensive investigation on the high-frequency dielectric properties of (ZrO2)100-x(BaTiO3)x heterostructures. By adjusting the content of BaTiO3, we could modify the dielectric constant of the resulting ceramic sheets. Our results demonstrated successful fabrication of heterostructured ceramic sheets and the ability to tailor the electric, structural, and dielectric properties of both ZrO2 and BaTiO3 materials. Furthermore, the evolution of the dielectric constant could be manipulated according to specific technological applications.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Jing Shi, Rizhuang Dong, Jiayi He, Daowei Wu, Wenchao Tian, Xiao Liu
Summary: This study investigated the structural, dielectric, and ferroelectric properties of lead-free ceramics based on the ternary system of BaTiO3 (BT). It was observed that the dopant concentration influenced the structural evolution from tetragonal to pseudocubic phase. The dielectric response showed diffusive peaks and relaxor behavior, indicating a transition from ferroelectric to relaxor state. The ceramics exhibited slim polarization hysteresis loops and electrical inhomogeneities caused by excessive dopant addition, leading to degraded electric breakdown strength. The oxygen vacancy hopping mechanism was proposed to explain the diffuse dielectric response at high dopant concentrations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
C. Molin, T. Richter, S. E. Gebhardt
Summary: This study optimized the electrocaloric properties of a lead-free material system based on barium titanate by introducing strontium and tin, leading to the preparation of solid solutions with high EC effect at room temperature and a wide temperature range. The influence of different Sn:Sr ratios on dielectric and ferroelectric properties was investigated, with the most promising results achieved for the BSSnT-18-6.5 composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Kanyapak Silakaew, Ekaphan Swatsitang, Prasit Thongbai
Summary: The dielectric properties of a novel polymer dielectric material were investigated by incorporating conductive RuO2 and high-permittivity nBT into PVDF. The interfacial polarization between RuO2-nBT and RuO2-PVDF interfaces played a critical role in improving the dielectric properties of the composites.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Tsang-Tse Fang, Yu-Chi Lu, Hsing- Hsiang
Summary: In this study, the calculation of space charge potential, the difference of the activation energy of grain boundary and grain, and the ratio of conductivity of grain boundary and grain at different temperatures of polycrystalline ceramics were reevaluated. The model takes into account charge carriers hopping through bulk and grain boundary barriers with different mobility. It was found that the present model is more accurate and precise than previous models, indicating that the assumption of the same mobility of charge carriers hopping through bulk and grain boundary barriers made in previous studies is unsuitable.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Polymer Science
Shang Ke Yang, Zhao Xin Zhang, Ai Ping Zhang, Hai Lan Lin, Xun Tao Zhang, Liu Xin Xiao, Jun Bian, Dai Qiang Chen
Summary: This study employed PVP@BT nanoparticles as functional nanofillers to fill PI matrix and fabricated PI nanocomposite films. The results showed that the addition of PVP@BT nanoparticles enhanced the molecular weight, viscosity, and dispersion of the nanocomposite films, leading to improved dielectric properties. The nanocomposite films with 10 wt% PVP@BT nanoparticles exhibited a higher dielectric constant and lower dielectric loss compared to pure PI. Additionally, both pure PI and PI nanocomposite films showed excellent thermal stability.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Ceramics
N. A. Zhuk, N. A. Sekushin, D. V. Sivkov, A. V. Popov
Summary: Co-doped CaCu3Ti4O12 samples were synthesized by solid-phase reaction. Electrical properties of the samples were studied in wide temperature and frequency ranges. The presence of the copper oxide interlayer reduced the dielectric constant. The amount of impurity copper increased with the cobalt content. The samples had a granular microstructure and exhibited low- and high-frequency polarization. The best values of dielectric permittivity and dielectric loss tangent were observed in the CaCu3Ti3.94Co0.06O12- delta sample.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Chen Zhang, Zixin Zhou, Zhuming Tang, Didier Ballo, Chun Wang, Gang Jian
Summary: The Sc2O3 doped Ba(Zr0.1Ti0.9)O-3 ferroelectric ceramics were investigated for their microstructure, domain structure, dielectric and ferroelectric properties. It was found that Sc2O3 doping decreased the grain size, while both 90 degrees and 180 degrees ferroelectric domains coexisted in the ceramics. The phase transition temperature and dielectric permittivity maximum decreased with increasing Sc2O3 content, but the relative dielectric constant temperature stability was improved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Neha, Preeti Sharma, Vinod Kumar, Manoj Bhatnagar, Parveen Kumar, Chandra Prakash
Summary: Polycrystalline ferroelectric ceramics with compositional formula Ba0.70-xCa0.30SmxTi1-xFexO3 (BCSTF) were prepared by solid state reaction route and their properties were investigated. The results suggest that these ceramics have potential applications in areas such as capacitors, dielectric bolometers, and electrocaloric applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Thomas Schulz, Andrea Knauer, Peter Schaaf, Joerg Toepfer
Summary: The study focused on optimizing alloy composition to improve high-temperature dielectric properties, and investigated the effects of excess bismuth and manganese doping on performance. The results showed that the addition of small amounts of manganese extended the low-loss temperature range, while excess bismuth limited the application temperature range.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Rajdip Roy, Abhigyan Dutta
Summary: This study investigated the effect of vanadium doping on the conductivity and relaxation dynamics of charge carriers in Sodium Bismuth Titanate perovskite material. The sample with 15% doping exhibited the highest conductivity and dielectric strength. Analysis of the conductivity mechanism using complex impedance method revealed comparable activation energies for conduction, relaxation, and migration of charge carriers.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Marin Cernea, Mihail Secu, Roxana Radu, Paul Ganea, Vasile Adrian Surdu, Roxana Trusca, Eugenia Tanasa Vasile, Elisabeta Corina Secu
Summary: The study synthesized polycrystalline Ba1-xTbxTiO3 materials and analyzed their photoluminescence and dielectric properties, revealing that increasing terbium content reduces Curie temperature and increases phase transition diffuseness. UV-vis reflectance spectra showed a decrease in band gap energy with higher Tb content, while photoluminescence spectra demonstrated terbium enhances photoluminescence accompanied by self-trapped exciton emission.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Alireza Ramezani, Hossein Abdizadeh, Mohammad Reza Golobostanfard
Summary: BaTiO3 and SrTiO3 thin films and BaTiO3/SrTiO3 lamellar composites were successfully synthesized using the sol-gel spin-coating method in this study. The morphology and band gap of the composite samples could be altered by changing the periodicity of the samples. The optical properties of the multi-stacked composites, including dielectric constant, dielectric loss, impedance, Urbach tail, extinction coefficient, and electric modulus, were also investigated.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Kendra S. Belthle, Ute N. Gries, Michael P. Mueller, Dennis Kemp, Abhinav Prakash, Marc-Andre Rose, Jacqueline M. Boergers, Bharat Jalan, Felix Gunkel, Roger A. De Souza
Summary: The properties and concentrations of native point defects in the perovskite oxide BaSnO3 were studied using a combination of experiments and simulations. The results provide insights into the material's characteristics and stability.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Fan Yang, Yidong Hu, Qiaodan Hu, Sebastian Steiner, Till Froemling, Linhao Li, Patrick Wu, Emilio Pradal-Velazquez, Derek C. Sinclair
Summary: The research found that the polymorphic form of TiO2 reagent has a significant impact on the electrical conductivity and conduction mechanism of NBT ceramics. NBT prepared with rutile TiO2 is ionically conductive, while NBT prepared with anatase TiO2 is insulating. This highlights the importance of selecting the appropriate TiO2 reagent for different applications of NBT-based ceramics.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Multidisciplinary
Leonie Koch, Sebastian Steiner, An-Phuc Hoang, Arne J. Klomp, Karsten Albe, Till Froemling
Summary: Solid solutions of sodium bismuth titanate (NBT) are the most performant lead-free dielectric ceramics for energy storage. The defect chemistry of NBT is complex, and acceptor doping can result in unexpected and extraordinarily high oxygen ionic conductivity. This study elucidates the interaction between acceptors and oxygen vacancies and rationalizes the observed differences in conductivity through experiments and calculations.
Book Review
Materials Science, Multidisciplinary
David P. Cann
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Joe Kler, Roger A. De Souza
Summary: This study demonstrates an indirect method to probe the thermodynamics of water incorporation, using perovskite oxide samples subjected to H218O/H216O exchange annealing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Energy & Fuels
Francesco M. Chiabrera, Federico Baiutti, Jacqueline M. Boergers, George F. Harrington, Lluis Yedra, Maciej O. Liedke, Joe Kler, Pranjal Nandi, Juan de Dios Sirvent, Jose Santiso, Miguel Lopez-Haro, Jose J. Calvino, Sonia Estrade, Maik Butterling, Andreas Wagner, Francesca Peiro, Roger A. De Souza, Albert Tarancon
Summary: This study investigates the impact of Mn deficiency on oxygen mass transport properties in perovskite oxides, and highlights the importance of antisite defects in mitigating the effects of nonstoichiometry on oxygen transport.
JOURNAL OF PHYSICS-ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Joe Kler, Jacqueline M. Borgers, Roger A. De Souza
Summary: The effect of surface orientation on oxygen surface exchange coefficient and surface space-charge potential in single-crystal SrTiO3 is studied. The results show that surface orientation has a significant influence on these properties.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Sylvia Koerfer, Alexander Bonkowski, Joe Kler, Peter Hatton, Blas Pedro Uberuaga, Roger A. De Souza
Summary: In this study, cation diffusion in fluorite-structured CeO2 is investigated using classical molecular dynamics and metadynamics simulations. It is found that cation diffusion primarily occurs through cation divacancies, rather than isolated vacancies or cation vacancy-oxygen vacancy associates.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Adrian L. Usler, Dennis Kemp, Alexander Bonkowski, Roger A. De Souza
Summary: Analysis of the mean squared displacement of species k as a function of simulation time allows the extraction of tracer diffusion coefficient from a molecular dynamics simulation. The statistical error in the diffusion coefficient is often underestimated. In this study, we examined the statistics of displacement curves generated by solid-state diffusion and derived a closed-form expression for the relative uncertainty in the diffusion coefficient.
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2023)
Article
Materials Science, Ceramics
Qaisar Khushi Muhammad, Marcela Valderrama, Mengkun Yue, Alexander Karl Opitz, Stefanie Taibl, Matthaus Siebenhofer, Enrico Bruder, Juergen Fleig, Xufei Fang, Till Froemling
Summary: Tailoring the electrical conductivity of functional ceramics through introducing dislocations has recently been a focus of research, and its merits have been demonstrated through mechanical means. However, controlling the generation and annihilation of dislocations remains difficult. In this study, a micromechanical approach was used to demonstrate control over these aspects on yttria-stabilized zirconia (YSZ). The results showed a significant enhancement in conductivity in dislocation-rich regions compared to pristine ones, mainly attributed to oxygen ionic conductivity. This study illustrates the possibility of increasing conductivity and provides a prospect for transferring the merits of dislocation-tuned electrical conductivity to solid oxygen electrolytes.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Maximilian Gehringer, An-Phuc Hoang, Lovro Fulanovic, Kostja Makarovic, Barbara Malic, Till Fromling
Summary: Currently, research on capacitor materials for high-temperature and power electronics focuses on achieving new record-breaking limits for dielectric properties or energy storage densities, with little regard for the stability of key parameters during operation or component reliability. Multilayer ceramic capacitors based on lead-free sodium bismuth titanate with AgPd inner electrodes have exhibited exceptional stability of properties and capacitance at high temperatures and voltages during operation, which can help to open up the field of high-temperature and power electronics. Despite the lack of precise requirements and limits specified by manufacturers and industry, their extensive stability of dielectric properties allows for a rather universal application.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Roger De Souza, George Harrington
Summary: The study of point defects in non-metallic crystals is important for various materials applications. Consistent definitions and terminology are necessary for progress in this field. This Comment clarifies the definitions of point defects, advocates for the correct use of relative charge in their description, and emphasizes their recognition as quasiparticles.
Article
Instruments & Instrumentation
Michael S. Bowen, David P. Cann, C. Rigel Woodside
Summary: High-quality data on the high temperature electrical properties of ceramics, such as oxides, are valuable for material selection, design, and modeling in various emerging applications. This study presents a purely mechanical method using the mismatch in the coefficient of thermal expansion between two materials to establish electrical contact in the van der Pauw geometry for measuring the bulk resistivity of ceramic disks at high temperatures.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Chemistry, Physical
Alexander Bonkowski, Caitlin Perkampus, Roger A. De Souza
Summary: By molecular dynamics simulations, we predict that substituting Ba with Ca yields a material, Ca0.5Sr0.5Co0.8Fe0.2O3-delta, that exhibits similarly high oxygen-vacancy diffusivity in its cubic form.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Michael S. Bowen, Kyei-Sing Kwong, Peter Hsieh, David P. Cann, C. Rigel Woodside
Summary: Corrosion by alkali metals and their compounds is a significant challenge for metal alloys and ceramics at high temperatures. Evaluating several refractory ceramics, this study found that magnesia and ceria exhibited resistance to corrosion by potassium vapor, making them potential long-lived components in MHD generators.
MATERIALS PERFORMANCE AND CHARACTERIZATION
(2022)
Article
Materials Science, Ceramics
Zilong Xiong, Wenzhuo Xue, Mujun Li, Feihu Tan, Yupeng Chen, Hongyu Yu
Summary: In this study, CBS glass/Al2O3 composites were developed for LTCC applications based on a CaO-B2O3-SiO2 (CBS) glass system with a high boron content. The study revealed that the softening of glass and interfacial reaction between the glass and Al2O3 were the two most important factors affecting LTCC's densification process. Real-time shrinkage rate of LTCC during sintering was successfully simulated, and it was proven that the formation of the CaAl2(BO3)O phase played a significant role in reducing glass viscosity and promoting dense structure formation. The resulting LTCC composite exhibited excellent performance for high-frequency applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Saurabh Kumar Sharma, Vinita Grover, Rakesh Shukla, Abid Hussain, Ambuj Mishra, Pawan Kumar Kulriya
Summary: In this study, the disordering caused by swift heavy ion irradiation in two different compositions of pyrochlore structures was investigated. X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy were used to analyze the samples before and after irradiation. It was found that both compositions underwent amorphization due to irradiation, with a slower rate observed in Nd1.8Zr2.2O7.1. The irradiation-induced modified track region in Nd1.8Zr2.2O7.1 consisted of defect-rich pyrochlore structure, anion-deficient fluorite structure, and amorphous domains.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiabei He, Mengshan Song, Ming Yang, Miaomiao Zhu
Summary: This study investigates the influence of ion irradiation on high-entropy ceramics and finds that irradiation-induced lattice rearrangement can improve the radiation resistance of these ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yajie Yu, Shi He, Zhengang Zhang, Haihua Chen, Peipeng Jin, Binnian Zhong, Linhui Zhang, Liping Wang, Cheng Lu
Summary: Silicide ceramics, including tantalum disilicide (TaSi2), are known for their exceptional physical properties but are limited in practical applications due to their inherent brittleness at room temperature. In this study, we successfully improved the mechanical properties of TaSi2 ceramics and increased their electrical conductivity by modifying the preparation methods and sintering conditions. These findings provide valuable insights for future applications of TaSi2 and the design of advanced ceramic materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jian Li, Jia Liu, Yongcui Zhang, Wei Sun, Yang Wang, Haitao Wu, Ling Li, Chuanbing Cheng, Yingying Wang, Ke Tan, Futian Liu
Summary: Microstructure design plays a crucial role in regulating the microwave dielectric properties of materials, however, the understanding of frequency temperature stability and related micromechanism remains limited. In this study, a combination of first-principles calculations and experimental observation was used to investigate the correlation among sintering behavior, crystal structure, bonding nature, and microwave dielectric properties of LnPO(4) (Ln = Eu, Pr) ceramics. The research findings systematically clarify the optimized effect and micromechanism of lanthanides on the dielectric properties of monazite ceramics, providing insights into the design and enhancement of microwave dielectric materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Wenqian Pan, Xizhen Xia, Wei Zhou, Yang Li
Summary: The study investigates the frictional and wear behaviors of carbon fiber-reinforced SiC ceramic matrix composites with different fiber orientations mating with ceramic balls. The results show that fiber orientation significantly affects the friction and wear properties of the composites. Pads with randomly arranged fibers demonstrate better friction stability and lower wear volume, potentially suitable for bearing material applications. The research also explores the factors influencing the formation of continuous tribo-film and identifies abrasive wear and oxidation wear as the dominant wear mechanisms for the friction pairs.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sergey Nikolaevich Perevislov, Ilya Evgenievich Arlashkin, Valentina Leonidovna Stolyarova
Summary: This paper describes the synthesis and sintering of MAX phases in the Zr-Al-C system. Different mixtures of initial Zr/Al/C and Zr/Al/ZrC powders were used to synthesize Zr2AlC and Zr3AlC2 MAX phases. The highest content of Zr3AlC2 MAX phase was obtained using a component ratio of 1:1.5:2-51.1 vol.% of Zr/Al/ZrC powders.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Weijia Luo, Xubin Wang, Baiheng Bai, Jianli Qiao, Xingcong Chen, Yongzheng Wen, Jingbo Sun, Lingxia Li, Ji Zhou
Summary: This study successfully establishes the relationship between internal strain and dielectric loss by synthesizing and designing specific structure of tungsten bronze ceramics, and concludes that controlling internal strain can effectively reduce dielectric loss. This research is of great significance for the development of future all-ceramic non-Hermitian devices.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Santanu Mondal, Juan Diego Shiraishi Lombard, Sreenivasulu Gollapudi, Carolina Tallon, Jie-Fang Li, Dwight Viehland
Summary: Ultrafast high-temperature sintering (UHS) is an effective method for rapidly densifying ZrB2 powders. The final grain size increases with longer sintering duration. X-ray diffraction and energy-dispersive spectroscopy show crystalline phase and compositional uniformity in ZrB2 after UHS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
JiaNan Wang, ZhiQiang Li, YongZheng Zhu, Yao Liang, Yan Cui, HuaLong Tao, Bo Song, Alexander Nikiforov, ZhiHua Zhang
Summary: First-principles calculations were performed to investigate the crystal structure, electronic structure, and ion diffusion of sulfur-doped Li2FeSiO4. The results showed that sulfur doping can improve the electronic conductivity and reduce the energy barrier for ion diffusion.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Xiaodi Dai, Serdar Aydin, Mert Yuecel Yardimci, Gunter Reekmans, Peter Adriaensens, Geert De Schutter
Summary: This study investigates the rheological behavior, solidification process, and nanostructure changes of sodium hydroxide-activated slag (NH-AAS) and sodium silicate-activated slag (SS-AAS) pastes over time. The results show that NH-AAS and SS-AAS release similar heat and reach a similar reaction degree at their initial setting times, but have different gel structures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yanliang Ji, Simon Becker, Zichen Lu, Alexander Mezhov, Regine von Klitzing, Schmidt Wolfram, Dietmar Stephan
Summary: This study reveals the significant influence of resting time on the rheological properties of cement suspensions, which is closely related to non-absorbed polycarboxylate superplasticizers (PCEs) size variation. Adsorbed PCE during resting tends to bridge particles instead of dispersing them, leading to an increased yield stress.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu
Summary: This study investigates the effect of K/Na ratio on the phase structure, ferroelectric domains, and piezoelectric properties of potassium sodium niobate (KNN)-based ceramics. It reveals that high Na+ content leads to large ferroelectric domains, while high K+ content results in local polarity heterogeneity and distinct dielectric relaxational behavior. The balanced local polarity and stress heterogeneities contribute to improved piezoelectricity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zun Xia, Yedong Rong, Hao Li, Ye Dong, Hongbo Yu, Jie Xu, Xiuhui Wang, Jinlong Yang
Summary: This study presents the synthesis of hollow MgAl2O4 particles in situ within porous ceramics, resulting in volume expansion and the formation of a hierarchical pore structure, leading to a significant improvement in compressive strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Honglong Wang, Zhiguo Sun, Faming Xia, Chenguang Yang, Xiaoguang Wang, Jintang Li, Linxu Jiang
Summary: In this study, the micro-geometry morphology variation and microstructural transformation mechanism of muscovite crystals under electron beam irradiation were explored. The results revealed the instability of the muscovite lattice under irradiation, as well as the expansion and shrinkage of the lattice with increasing dose. The study also identified changes in chemical structure and other mechanisms involved. These findings are significant for the design of radiation-resistant silicate materials and the manufacturing of electronic components used in the aerospace industry.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)