Article
Chemistry, Multidisciplinary
Mingguang Yao, Fangren Shen, Dezhou Guo, Hua Zhang, Chunguang Zhai, Yuchen Shang, Jiajun Dong, Yuanlong Zhao, Zhaodong Liu, Zhipeng Li, Haixin Li, Hongdong Li, Qi An, Bingbing Liu
Summary: Introducing nanostructures into diamonds can synthesize superhard materials, but grain boundary effects become crucial yet complicated in nanopolycrystalline diamond (NPD), making it challenging to tailor nanostructures. This study demonstrates a strengthening strategy for sintered NPD by introducing thin amorphous grain boundary (AGB) using atomistic simulations and experiments. The sintered NPD with thin AGB shows significant hardness and fracture toughness enhancement, exceeding that of single crystal diamonds. This study suggests that grain boundary modulation provides a promising approach for designing high-performance superhard materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Mechanical
Jinliang Du, Jie Li, Yunli Feng, Ying Li, Fucheng Zhang
Summary: In order to improve the strength and plasticity of structural materials, various strengthening mechanisms are introduced. In this study, a deep learning network structure based on the residual algorithm was optimized using transfer learning data to establish a yield strength prediction model for polycrystalline metallic materials. A medium carbon steel heterostructure design strategy was proposed and successfully applied to prepare medium-carbon heterostructure materials with mixed strengthening mechanisms. The MHSM showed excellent comprehensive mechanical properties.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Mechanics
Steven Xu, Malcolm Griffiths, Douglas A. Scarth, Dave Graham
Summary: The aging of Inconel X-750 spacers in CANDU reactors is managed through various methods, including inspection, material testing, research, and evaluation. Crush tests and simulations have shown that the load carrying capacity of the spacers decreases with operating time and can result in inter-granular failure. The presence of helium bubbles perforating material interfaces is a key factor in this degradation.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Physics, Fluids & Plasmas
Tatu Pinomaa, Nana Ofori-Opoku, Anssi Laukkanen, Nikolas Provatas
Summary: The vector order parameter phase field model is proposed for modeling polycrystalline solidification of alloys, showing quantitative behavior in binary alloys and consistent results with earlier theoretical work on grain boundary energy and solute back-diffusion. This model serves as a practical computational tool for simulating polycrystalline materials and can be extended to model multiple solid phases in higher dimensions.
Article
Engineering, Manufacturing
Jie Ren, Min Lai, Fengzhou Fang
Summary: Molecular dynamics simulation is used to investigate the effects of different grain orientations on the surface morphology of polycrystalline cerium-lanthanum alloy during nanometric cutting. The causes of elastic deformation on the workpiece surface are clarified through the analysis of atomic motion trajectories, and grain boundary migration is observed during the simulation. The results indicate that slip deformation is the main factor influencing plastic deformation in the processing, and the number of slip lines affects the surface step height of polycrystals.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Chemistry, Physical
Alexey Rodin, Ainur Khairullin
Summary: The peculiarities of Ni and Fe diffusion in polycrystalline Cu and Cu-Fe alloys at a temperature range of 650-750 degrees C were studied. The obtained values of the Ni GB diffusion triple product were an order of magnitude less than the values obtained by the radiotracer method. The significant supersaturation of the Cu-based solid solution near the Fe/Cu interface was confirmed as a peculiarity of Fe diffusion.
Article
Materials Science, Multidisciplinary
Pulkit Garg, Zhiliang Pan, Vladyslav Turlo, Timothy J. Rupert
Summary: Interfacial segregation and subsequent complexion transitions in polycrystalline Cu-Zr alloys were studied using hybrid Monte Carlo/molecular dynamics simulations. It was found that at moderate temperature, grain boundary segregation is the dominant behavior, with heterogeneous segregation within the boundary network. Changes in physical parameters correlated with dopant concentration. At higher temperature, a significant fraction of originally ordered boundaries transitioned to amorphous complexions, demonstrating the coexistence of different complexion types.
Article
Materials Science, Multidisciplinary
Kazuki Shibanuma, Taiga Fukada, Hideo Yasumoto, Kenji Tokuda, Byung-Nam Kim, Kamran Nikbin
Summary: In order to evaluate creep in materials under actual-use conditions, it is necessary to consider the polycrystalline morphology. A model has been proposed in this study to quantitatively predict the influence of 3D poly-crystalline morphology on Coble creep deformation. The model was validated and found to accurately reproduce the influences of grain size, applied stress, and temperature. Additionally, it provided quantitative predictions of materials performance under any loading or temperature condition.
MATERIALS & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
Alice Chlupova, Ivo Sulak, Tomas Babinsky, Jaroslav Polak
Summary: In this study, the fatigue behavior and initiation mechanism of intergranular cracks in polycrystalline copper specimens were investigated. Scanning electron microscopy was used to observe the crack formation on the electrolytically polished specimen surfaces, and a correlation was found between the occurrence of extrusions and intrusions on the grain boundaries and the formation of corrugated surface near the intergranular cracks. These findings contribute to a better understanding of the fatigue behavior and initiation mechanism of intergranular cracks in polycrystalline copper.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Charles Otieno Ogolla, Yannik Loth, Tobias Haeger, Cedric Kreusel, Manuel Runkel, Thomas Riedl, Benjamin Butz, Anna Katharina Wigger, Stephan Schaeffer, Peter Haring Bolivar
Summary: In this study, THz-sSNOM was used for nanoscale imaging of CsPbBr3 thin films, and the local THz nanoscale conductivity was derived using a scattering model. The analysis of the obtained signals confirmed the presence of halide vacancies (VBr) and Pb-Pb bonds at the CsPbBr3 grain boundaries, which resulted in charge carrier trapping and nonradiative recombination. This study establishes THz-sSNOM as a powerful analysis platform for thin-film semiconductors like LHPs.
Article
Engineering, Chemical
Zemin Li, Jingxian Hua, Rujing Hou, Yichang Pan
Summary: Polycrystalline metal-organic framework membranes (PMOFMs) have emerged as a new opportunity for gas separation membranes due to their well-defined molecular transport pore channels, high porosity, and tailorable frameworks. PMOFMs have shown potential to compete with existing separation technologies for important gas separation pairs, such as C3H6/C3H8, under attractive economic criteria. However, the development of advanced fabrication techniques to achieve defect-free PMOFMs in large-area constructions remains a key challenge.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Instruments & Instrumentation
Liyun Qin, Shiteng Wu, Jeffrey Gan Wang, Qinliang Li, Cailei Yuan, Zhendong Wang, Jianyu Wang, Zhengguang Hu, Li Wang, Qisheng Wang
Summary: In this study, highly-oriented and highly-crystalline centimeter-scale PbS polycrystalline thin films were successfully prepared using low-pressure chemical vapor deposition technology. The crystallinity of the PbS thin film was significantly improved by modulating the substrate temperature. It was found that PbS thin film detectors with high crystallinity exhibited fast response to short-wave infrared.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Elida I. de Obaldia, Jesus J. Alcantar-Pena, Frederick P. Wittel, Jean Francois Veyan, Salvador Gallardo-Hernadez, Yury Koudriavtsev, Dainet Berman-Mendoza, Orlando Auciello
Summary: This paper investigates the effect of hydrogen atom insertion into the grain boundaries of polycrystalline diamond films, focusing on the H atom concentration and its impact on the properties. The study suggests a simple model where two dangling bonds per unit cell of C atoms serve as the site of hydrogen incorporation. The experiment results show that the concentration of H atoms at the grain boundaries is consistent regardless of grain size. Conductive atomic force microscopy and ultraviolet photoelectron spectroscopy techniques were used to observe the electrical behavior and metallic properties of the films.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Donglin Luan, Yabin Wang, Muchao Li, Jun Chen
Summary: This study explores the shock-induced spallation mechanism of polycrystalline uranium using molecular dynamics and analyzes the role of grain boundaries in it. The study reveals that the growth and fusion of voids are the main mechanisms of uranium spallation, and grain boundaries significantly affect the nucleation and growth of voids. The study also verifies a mutual promotion relationship between the growth of voids and local thermal dissipation, which greatly promotes spallation development. Furthermore, the study finds that the grain boundary effect on spallation is influenced by the shock intensity.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Nikolai Zolotorevsky, Valery Rybin, Elina Ushanova, Natalia Ermakova, Vladimir Perevezentsev
Summary: The large-scale banding in metallic materials during cold deformation is studied in iron using EBSD, revealing three types of transition zones between differently oriented in-grain domains. The study discusses the underlying heterogeneities of plastic flow leading to the formation of deformation-induced high-angle boundaries in terms of polycrystal micromechanics.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Physics, Applied
T. A. Oloye, M. Matras, J. Jiang, S. Hossain, Y. Su, U. P. Trociewitz, E. E. Hellstrom, D. C. Larbalestier, F. Kametani
Summary: The study reveals that the quality of quasi-biaxial texture in Bi-2212 round wires is closely related to the critical current density (J(c)), with variations primarily influenced by filament and intergrain connectivity. Optimization of J(c) in Bi-2212 RWs requires enhancing biaxial texture quality and grain boundary cleanliness.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Applied
Sang-il Kim, David C. Larbalestier
Summary: In this study, the transport characteristics of low-angle grain boundaries in YBCO-coated conductors were improved by using strain-driven segregation, specifically by substituting Nd3+ for Y3+. It was found that this substitution can enhance the critical current density J(c) across the grain boundaries without significant reduction in the superconducting critical temperature T-c.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
A. Molodyk, S. Samoilenkov, A. Markelov, P. Degtyarenko, S. Lee, V. Petrykin, M. Gaifullin, A. Mankevich, A. Vavilov, B. Sorbom, J. Cheng, S. Garberg, L. Kesler, Z. Hartwig, S. Gavrilkin, A. Tsvetkov, T. Okada, S. Awaji, D. Abraimov, A. Francis, G. Bradford, D. Larbalestier, C. Senatore, M. Bonura, A. E. Pantoja, S. C. Wimbush, N. M. Strickland, A. Vasiliev
Summary: Researchers have reported a new type of high-temperature superconductor wire with high and reproducible engineering current density, achieved through a simple formulation with nanoparticles. This wire demonstrates robustness and scalability in production, enabling a reduction in HTS wire prices and advancing progress in fusion and other applications.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Chiara Tarantini, Chongin Pak, Yi-Feng Su, Eric E. Hellstrom, David C. Larbalestier, Fumitake Kametani
Summary: Fe-based superconductors, especially K-doped BaFe2As2 (K-Ba122), are promising materials for high-field applications, but the critical current density (J(c)) is still limited by connectivity issues. By analyzing the specific heat properties and T-c-distributions of K-Ba122 samples, this study identified factors affecting J(c) performance and suggested optimizing the heat treatment temperatures to improve connectivity and vortex pinning properties.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Shaon Barua, Daniel S. Davis, Yavuz Oz, Jianyi Jiang, Eric E. Hellstrom, Ulf P. Trociewitz, David C. Larbalestier
Summary: In summary, Bi2Sr2CaCu2O8+x (Bi-2212) is currently the only high-temperature superconductor capable of achieving a high critical current density under high magnetic fields. Recent improvements in Bi-2212 round wires have been attributed to optimization of the heat treatment process and a transition to a finer and more uniform powder. The distribution of critical current in Bi-2212 wires is compared to other materials like Nb-Ti, showing that the spread of critical current in Bi-2212 wires is about twice the relative standard of high-J(c) Nb-Ti well below H-irr. There is no obvious contribution of Bi-2212 anisotropy to the critical current distribution.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Engineering, Electrical & Electronic
Jianyi Jiang, S. Imam Hossain, T. Abiola Oloye, Yavuz Oz, Shaon Barua, Jonathan Cooper, Evan Miller, Yibing Huang, Jeff A. Parrell, Fumitake Kametani, Ulf P. Trociewitz, Eric E. Hellstrom, David C. Larbalestier
Summary: High engineering critical current density in Bi-2212 round wire has been achieved through a partial melt, overpressure heat treatment process, which varies strongly with processing conditions. A wide processing window with nearly constant results is desired for processing large coils, and this can be achieved by controlling the Bi-2212 powder melting or wire architecture design.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Materials Science, Multidisciplinary
Yavuz Oz, Jianyi Jiang, Maxime Matras, Temidayo Abiola Oloye, Fumitake Kametani, Eric E. Hellstrom, David C. Larbalestier
Summary: Bi2Sr2Ca1Cu2Ox (Bi-2212) is a high-temperature superconductor with high critical current density J(c) that is suitable for ultrahigh-field magnet applications. Its unique biaxial growth texture, high aspect ratio, large-grain morphology, and basal-plane-faced grain morphology contribute to high J(c) and a lack of weak-link signature, regardless of its oxygen doping state.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Physics, Applied
X. Hu, A. A. Polyanskii, D. Abraimov, A. Gavrilin, H. W. Weijers, F. Kametani, J. Jaroszynski, D. C. Larbalestier
Summary: The industrial production of REBa2Cu3O7-delta (REBCO) coated conductors has enabled the construction of a 32 T magnet, which is the first all-superconducting user magnet to exceed 30 T. In this study, the damage that occurred in the prototype coil during late-stage testing was analyzed. It was found that the damage was caused by fluctuations in vortex pinning density, which resulted in localized regions with low critical current (I-c) and intense heating.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Y. Oz, D. Davis, J. Jiang, E. E. Hellstrom, D. C. Larbalestier
Summary: Bi-2212 is the only high field, high-temperature superconductor available in a macroscopically isotropic, multifilament round wire form capable of generating high uniformity fields. However, the heat treatment that enables high J ( c ) values also produces filament bonding which enhances losses. Twisting reduces some losses but is less effective in reducing losses from bonding. Recent research shows that high J ( c ) Bi-2212 wires with reduced bonding can significantly improve transport J ( c ) and lower losses, supporting the production of high field, low loss HTS magnets made with Bi-2212 wires.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
J. Jaroszynski, A-M Constantinescu, G. Miller, A. Xu, A. Francis, T. Murphy, D. C. Larbalestier
Summary: Detailed knowledge of the full angular and wide temperature range characterization of the critical current I-c of REBCO coated conductors (CC) is crucial for the design of REBCO-based magnets. However, obtaining such data is expensive and difficult using traditional methods. This study presents J(c)(B,T,theta) results for a set of CC samples, highlighting the importance of considering the diverse properties of the samples when designing magnets.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Jeseok Bang, Seong Hyeon Park, Jeonghwan Park, Geonyoung Kim, Jung Tae Lee, Kwangmin Kim, Seungyong Hahn, David C. Larbalestier
Summary: This paper presents a system for real-time monitoring spatial and temporal electromagnetic behaviors of a high temperature superconductor (HTS) coil. The system consists of Hall sensors and voltage taps to measure spatial and temporal magnetic fields, and local voltages. The feasibility of the system is validated through simulations and experimental comparisons.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Jianyi Jiang, S. Imam Hossain, Shaon Barua, T. Abiola Oloye, Jozef Kvitkovic, Fumitake Kametani, Ulf P. P. Trociewitz, Eric E. E. Hellstrom, David C. C. Larbalestier, Daniel E. E. Bugaris, Claudia Goggin, Yibing Huang, Jeff A. A. Parrell, Tengming Shen
Summary: Bi-2212 is the only high temperature superconducting wire with a round geometry. Its performance depends on powder quality, conductor fabrication, and heat treatment. We report on the performance and microstructure variation of wires made with powders produced by Engi-Mat in recent years.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Materials Science, Multidisciplinary
Chiara Tarantini, Temidayo Abiola Oloye, S. Imam Hossain, Fumitake Kametani, Jianyi Jiang, Eric E. Hellstrom, David C. Larbalestier
Summary: Bi2Sr2CaCuOx (Bi-2212) is a high-T-c superconductor that shows promise for high-field applications. The critical current density (Jc) of Bi-2212 wires, fabricated using the powder-in-tube technique, depends on the heat treatment process. In this study, magnetic characterization techniques were used to analyze the microstructure and superconducting properties of differently processed Bi-2212 wires. The results show that the supercurrent flows at the filament bundle level, and the intergrain and intragrain superconducting properties contribute to the overall performance.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Physics, Applied
David C. Larbalestier
Summary: Alex Mueller's discovery of superconductivity in low carrier density oxides has had significant impacts on high magnetic field technology, particularly on the use of cuprate superconductors to generate stronger magnetic fields than Nb-based low temperature superconductors. Lessons from Bednorz and Mueller's discovery highlight the importance of high current density conductors for practical applications of temperature superconductors. The use of rare earth alloy magnets made with YBCO (REBCO) has become commonplace in NMR labs, and prototype magnets made with REBCO are poised to enable compact fusion reactors.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Ferran Valles, Anna Palau, Dmytro Abraimov, Jan Jaroszynski, Anca-Monia Constantinescu, Bernat Mundet, Xavier Obradors, David Larbalestier, Teresa Puig
Summary: Optimizing the microstructural of YBa2Cu3O7-x coated conductors is vital for enhancing the critical current. The magnetic flux pinning capabilities of these conductors vary with different regions of the magnetic field-temperature phase diagram and the orientation of the magnetic field. By investigating the critical current density in a wide temperature range and high magnetic fields, we have identified promising methods for artificially engineering YBCO coated conductors in any region of interest. Furthermore, we have identified the key factors that contribute to enhanced pinning performance at high magnetic fields and low temperatures.
COMMUNICATIONS MATERIALS
(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)