Article
Materials Science, Ceramics
Gopal Prasad Khanal, Ichiro Fujii, Sangwook Kim, Shintaro Ueno, Satoshi Wada
Summary: Lead-free piezoelectric ceramics were prepared with the addition of (Bi0.5K0.5)TiO3 and BiFeO3 components via solid-state reaction method. The study found that increasing the concentration of (Bi0.5K0.5)TiO3 can enhance the piezoelectric performance of the material while reducing the dielectric maximum temperature.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Seok-Mo Kang, Tae Wan Kim, Nam-Hoon Kim, Sung-Jin Kim, Jung-Hyuk Koh
Summary: The composition of lead-free piezoelectric ceramics (1 - x)(Bi0.5Na0.5)TiO3-x(Ba0.5Sr0.5)TiO3 with excellent piezoelectric properties was investigated in this study. Crystal analysis, electrical and piezoelectric properties were analyzed based on the content of BST composition. It was found that the optimal composition was 0.12 BST, which exhibited a phase change from rhombohedral to tetragonal structure, the highest permittivity, and the highest values of P-r, d(33), k(p), and Curie temperature (T-m). These results confirm that 0.12 BST is the optimal composition for (1 - x)BNT-xBST piezoelectric ceramics.
Article
Engineering, Electrical & Electronic
P. Parjansri, M. Kamnoy, S. Eitssayeam
Summary: (Bi0.5Na0.5)TiO3 (BNT) ceramics were successfully synthesized using nanometric BNT particles as seeds by a seed-induced method. The effect of BNT seeds on phase formation, microstructure, and electrical properties was investigated. The results indicate that BNT seeds can enhance the electrical properties of BNT ceramics, including perovskite phase formation, density, dielectric constant, piezoelectric properties, and energy storage density.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yunting Cheng, Wenchou Fan, Hao Chen, Lixu Xie, Jie Xing, Zhi Tan, Jianguo Zhu
Summary: Potassium sodium niobate (KNN) ceramics are the most promising lead-free piezoelectric ceramics to replace lead zirconate titanate (PZT) ceramics. They have been widely studied for their application prospects in various electronic devices. The aim is to increase Qm while maintaining high piezoelectric activity in ultrasonic devices. The study shows that a KNN-based ceramic with high d33 and Qm can be prepared using a conventional solid-state technique. The formation of defect dipoles helps stabilize the ferroelectric order and hinder polarization rotation.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Jianzhou Du, Long Qiu, Cong Yang, Hongjuan Zheng, Kongjun Zhu, Luming Wang
Summary: BCZT-xCu lead-free piezoelectric ceramics were synthesized using a solid-state reaction method with CuO doping, which formed ABO(3) perovskite solid solution. X-ray diffraction and Raman spectra analysis revealed a phase transition caused by the introduction of CuO. Optimal electrical properties were achieved in the ceramic sintered at 1250℃ with 1 wt% CuO.
JOURNAL OF ELECTROCERAMICS
(2022)
Article
Materials Science, Ceramics
Senlin Leng, Hao Cheng, Renhui Zhang, Caiyun Gao, Zhicheng Li
Summary: The study prepared La-Mn codoped ceramics for lead-free positive temperature coefficient of resistivity (PTCR) thermistors, with experimental results showing that doping different concentrations of La and Mn can affect the performance of the thermistors. The XRD analysis revealed that the ceramics were composed of pure tetragonal perovskite phase, and the resistivity jump increased significantly with the doping of Mn. The role of grain boundary effect in PTCR performance was also highlighted in the study.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Yuting Wang, Junning Li, Ruihao Yuan, Hongcheng Gao, Jing Lv, Dezhen Xue, Xihong Hao, Yaodong Yang, Turab Lookman, Brahim Dkhil, Xiaojie Lou
Summary: In this study, CuO additive was introduced to lead-free BaSn0.11Ti0.89O3 (BST) ferroelectric ceramic, resulting in a significantly large adiabatic temperature change under a relatively low electric field. This work demonstrates the potential for enhancing the electrocaloric effect by tuning the intrinsic properties of EC materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Huajie Luo, He Qi, Shengdong Sun, Lu Wang, Yang Ren, Hui Liu, Shiqing Deng, Jun Chen
Summary: Achieving high piezoelectric performance in the (1-x)(Na0.5Bi0.5)TiO3-x(0.9BaTiO(3)-0.1BiAlO(3)) ternary system through crystal structure design, with the incorporation of BiAlO3 suppressing structural distortion and enabling extensive and reversible phase transformation under electric field. In-situ electric field synchrotron X-ray diffraction reveals that the crystal lattice of the R3c phase responds more flexibly to the electric field than that of the P4bm phase. Enhanced piezoelectric response is attributed to activated domain switching and lattice strain enhancement from subtle phase structure.
Article
Materials Science, Multidisciplinary
Yixuan Shen, Hang Xie, Yabin Sun, Jiwen Xu, Ling Yang, Xiaoyi Pan, Changrong Zhou, Hua Wang
Summary: Doping Mn can significantly reduce the grain size of ceramics and change their phase structure and electrical properties, transforming them from a ferroelectric phase to a relaxor phase. Moreover, with the increase of Mn content, the piezoelectric response gradually increases.
BULLETIN OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Zehuan Wang, Denghao Ma, Yunhan Wang, Yan Xie, Zhonghui Yu, Jin Cheng, Li Li, Liang Sun, Shuxiang Dong, Hong Wang
Summary: A design strategy inspired by Kirigami/Origami was proposed for the preparation of curved and porous piezoelectric ceramics with specific shapes. The ceramics produced using this strategy exhibit a high piezoelectric constant and are well-suited for use in the human body to detect pulse signals. This strategy provides a new approach for the large-scale and low-cost production of complex-shaped ceramics.
Article
Chemistry, Multidisciplinary
Liang Chen, Feixiang Long, He Qi, Hui Liu, Shiqing Deng, Jun Chen
Summary: Lead-free dielectric ceramics with ultrahigh energy storage performance have been successfully demonstrated in BKT-based ceramics by synergistically designing the domain and microstructure at multiscale levels. These ceramics exhibit excellent energy storage temperature and frequency stability, along with impressive charge/discharge performance, making them competitive candidates for energy storage capacitors in pulsed power devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Abd El-razek Mahmoud, M. Fangary, M. Nassary, O. Hemeda
Summary: A series of Pb-free ceramics were synthesized with varying compositions of ST addition, leading to changes in crystal structure and properties observed at different temperatures, indicating different domain structures and phase transitions.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
S. Y. Zhao, J. J. Bian
Summary: The effects of the CuOLi2CO3 additive on the sintering behavior, microstructure, and properties of a commercial soft lead zirconate titanate ceramic were studied. The addition of 0.1 wt% CuOLi2CO3 successfully reduced the sintering temperature to 1050 degrees C. Cu/Li ions incorporated into the lattice and formed secondary phases. The addition of CuOLi2CO3 resulted in changes in the concentration of phases and improved the dielectric and piezoelectric properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Zheng Wu, Jiaqian Yang, Xianyao Jiang, Xucheng Ke, Yu Cai, Tao Wang, Zhihua Duan, Zhongchen Gao, Feifei Wang
Summary: The piezoelectric and electromechanical properties of NBT-6BT lead-free piezoelectric ceramic were studied using AC polarization and DC polarization methods. The results showed that the thickness-mode electromechanical coupling coefficient (k(t)) of NBT-6BT near the MPB was significantly improved by AC polarization, with a 28.6% enhancement ratio. The enhancement was mainly due to the higher domain wall density boosted by AC polarization, as observed through piezoresponse force microscopy and X-ray diffraction.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Jianjia Zhang, Yue Wen, Mengmeng Hao, Fangfang Zeng, Huitao Guo, Guifen Fan, Wenzhong Lv
Summary: The KNLN-0.06BZ lead-free ceramics prepared by TSS exhibited higher density and better electrical properties compared to those prepared by CS, possibly due to fewer oxygen vacancies facilitating domain switching. Multiple phases may coexist in all ceramic samples, with lower energy barrier at the phase boundary allowing for effective domain switching and resulting in high piezoelectric properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Kengo Sakamoto, Manabu Hagiwara, Hiroki Taniguchi, Shinobu Fujihara
Summary: In this study, Bismuth silicate (BSO) ceramics were successfully fabricated for the first time using a sol-gel technique, achieving a high relative density and preventing thermal decomposition at low temperature. The BSO ceramic exhibited superior temperature stability and high energy storage efficiency, attributed to a sharp phase transition and unique polarization hysteresis loops.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Taro Yamauchi, Manabu Hagiwara, Shinobu Fujihara
Summary: Two types of trivalent lanthanide ions were doped into cubic perovskite-type BaSnO3, with La3+ as the electron donor and luminescent Ln(3+) ions as the second dopant. Sm3+ exhibited strong photoluminescence and the effects on optical and electrical properties were studied by varying La3+ and Sm3+ contents. Changes in PL intensity and electrical resistivity were observed based on the concentrations of La3+ and Sm3+.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Mako Tsuchiya, Shinobu Fujihara, Manabu Hagiwara
Summary: The influence of grain size on the dielectric properties of Sr0.6Ba0.4Nb2O6 (SBN60) ceramics with a tetragonal tungsten bronze structure was examined. The results showed that the maximum dielectric permittivity and dielectric maximum temperature of the SBN ceramics were less dependent on the grain size.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Manabu Hagiwara, Masahiko Tato, Daishi Shiojiri, Tsutomu Iida, Shinobu Fujihara
Summary: The combined effect of chemical doping and grain orientation on the thermoelectric properties of CuFeO2 ceramics was investigated. Ni doping was found to effectively enhance the electrical conductivity and reduce the thermal conductivity while maintaining a high Seebeck coefficient. CuFeO2 ceramics with a preferred c-axis orientation and doped with 1 and 3 mol% Ni exhibited an improved dimensionless figure of merit.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Hideaki Takahashi, Manabu Hagiwara, Shinobu Fujihara
Summary: Red-emitting CaTiO3:Pr3+ phosphor nanoparticles were successfully synthesized by a sol-gel method, exhibiting excellent optical properties. In comparison, CaTiO3:Pr3+ phosphor synthesized by a conventional solid-state reaction method demonstrated more defects and poorer optical properties. The study revealed a reversible dual luminescence/absorption switching in CaTiO3:Pr3+ sample, which can be achieved through oxidation and reduction treatments.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Yuta Shinjo, Masae Mori, Shinobu Fujihara, Manabu Hagiwara
Summary: Nanoparticles of Ti-doped ferroelectric BiFeO3 were synthesized and densified via a low-temperature sintering process, resulting in dense ceramics with a relative density over 90%. Ti doping effectively decreased the concentration of Fe4+ in the ceramics, leading to suppression of the extrinsic dielectric responses.
CERAMICS INTERNATIONAL
(2022)
Article
Electrochemistry
Masaya Sugihara, Manabu Hagiwara, Shinobu Fujihara
Summary: Metal-organic frameworks (MOFs) were used to modify nanoparticulate ZnO electrodes in order to enhance the performance of dye-sensitized solar cells (DSSCs). It was found that the immersion of the ZnO film in a low-concentration precursor solution effectively improved the photocurrent density and charge transfer, while also improving the durability of the cell.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Materials Science, Ceramics
Soon-il Kwon, Manabu Hagiwara, Sae-hoon Kim, Shinobu Fujihara
Summary: VO2 (M) powder was synthesized using a hydrothermal method and post-annealing treatment. The particle size of the powder was reduced and uniformized by ball-milling. The resultant VO2 (M) nanoparticles were dispersed in ethanol with PVP. The dispersion was coated on a transparent heater to produce VO2 (M)/PVP composite films, which showed a promising potential for transparent thermochromic devices.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Shota Kakimoto, Yujiro Hashimoto, Taro Kuwano, Koji Kimura, Kouichi Hayashi, Manabu Hagiwara, Kazuhiko Deguchi, Hiroki Taniguchi
Summary: Co-doping of heterovalent ions to rutile-type TiO2 has been studied to design high-permittivity materials with local structure engineering. However, the role of co-dopants in permittivity enhancement is still unclear. Dielectric measurements were performed on Nb + X (X = Al, Ga, In) co-doped and Nb-doped TiO2 single crystals before and after annealing to investigate the effects of co-dopants. The results suggest that the huge permittivity observed in the as-grown samples is due to thermally excited carriers, while the post-annealed samples show recovery of the insulating property through migration of X cations into the single crystal.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Ceramics
Maho Kitamura, Shinobu Fujihara, Manabu Hagiwara
Summary: We compared the microstructure and energy-storage properties of (Bi1/2K1/ 2)0.5Sr0.5TiO3 ceramics prepared via solid-state and hydrothermal reactions. The hydrothermally derived ceramics exhibited well-dispersed cubic nanoparticles, while the solid-state reaction resulted in the aggregation of primary particles. By controlling the sintering temperature, the grain size of the hydrothermally derived ceramics could be controlled between 273±24 and 936±69 nm, maintaining a relative density of over 95%. On the other hand, ceramics prepared via the solid-state reaction did not fully densify even at the highest tested sintering temperature of 1200 degrees C. The hydrothermally derived ceramics exhibited a high recoverable energy-storage density of 2.25 J/cm^3 at 240 kV/cm, attributed to their dense and fine-grained microstructure.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
Yoji Yasumoto, Taro Kuwano, Hiroki Taniguchi, Shinobu Fujihara, Manabu Hagiwara
Summary: Doping of La3+ into ferroelectric Bi(2)SiO(5) induces disorder in its crystal structure, leading to a transition into a paraelectric phase with superior temperature stability. Bulk La-doped Bi(2)SiO(5) ceramics were fabricated through sintering for potential use in ceramic capacitors.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Ceramics
Ryusei Ogawa, Shinobu Fujihara, Manabu Hagiwara
Summary: The effects of dual doping by trivalent and monovalent cations on the thermoelectric properties of CaMnO3 ceramics were investigated. It was found that dual doping of Na and R ions effectively decreased the thermal conductivity, and smaller and heavier R ions were more effective in obtaining a high thermoelectric power factor and a low thermal conductivity.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2022)
Article
Materials Science, Multidisciplinary
Hiroki Taniguchi, Taiga Hattori, Toshihiro Isobe, Akitoshi Nakano, Ichiro Terasaki, Manabu Hagiwara
Summary: The research reveals the presence of a unique phase boundary in (CS)AM-x within a specific composition range, with piezoelectric performance surpassing that of traditional lead-free perovskite-type ferroelectric oxides, suggesting a promising direction for the development of environmentally friendly piezoelectric-active materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Materials Science, Ceramics
Mana Miyachi, Manabu Hagiwara, Shinobu Fujihara
Summary: This study elaborated NiCo2O4 hexagonal nanoplatelet films with high specific surface area and light-scattering ability, which can effectively work as photocathodes in dye-sensitized solar cells.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2021)
Article
Materials Science, Ceramics
Manabu Hagiwara
Summary: This paper reviews the fabrication process and fundamental properties of high-quality (Bi1/2K1/2)TiO3 ceramics, including crystal structure, physical/chemical stability, phase transition behavior, and compositional modifications for dielectric and piezoelectric materials. The hydrothermal synthesis method is utilized for the fabrication of (Bi1/2K1/2)TiO3 ceramics, and the electrical and electromechanical responses of the ceramic samples are discussed for potential applications in capacitors and actuators.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2021)
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)