Article
Materials Science, Ceramics
Zhang Haoming, Song Yan, Sang Weiwei, Guo Yihao, Zhao Yukun, Zhao Yuzhu, Song Shen, Li Chunmeng, Li Runtao, Li Zhengzhuo, Zhang Hongsong, Zhang Xiaoli, Chen Xiaoge
Summary: Two novel high-entropy ceramics, (La0.25Nd0.25Yb0.25Y0.25)(2)Ce2O7 and (La0.25Dy0.25Yb0.25Y0.25)(2)Ce2O7, were synthesized via a sol-gel technique and sintering at high temperatures. The obtained samples exhibit single fluorite lattice, dense microstructure, and uniform element distribution. Due to the high-entropy influence, the ceramics have lower thermal conductivities and higher thermal expansion coefficients compared to 7YSZ, while maintaining outstanding lattice stability at high temperatures.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Wenhui Ye, Bo Yan, Jinxu Ma, Qiang He, Linan An, Kepi Chen
Summary: Recently, high-entropy perovskite oxides (HEPOs) have gained attention for energy storage applications due to their unique structure, wide composition range, and promising properties. However, enhancing the energy storage performance of HEPOs is still a challenge. In this study, HEPOs were designed by partially substituting Zr4+ for Ti4+ in (Bi0.4Ba0.2K0.2Na0.2)TiO3 medium-entropy ferroelectric ceramics. The resulting ceramics exhibited a pseudo-cubic structure and showed improved energy storage performance with increasing Zr4+ content. The sample with 20 mol% Zr4+ demonstrated the best energy storage performance, with a maximum reversible energy density of 2.47 J/cm(3) and an energy storage efficiency of 82.3% at a low applied electric field (224 kV/cm). This study provides a promising material for the development of next-generation dielectric energy storage capacitors and introduces a novel method for enhancing energy storage performance.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Feng Li Lin, Bing Liu, Qing Wei Zhou, Yu Hua Cheng, Kai Xin Song
Summary: Novel non-equimolar high-entropy ceramics with a layered perovskite structure, SLAZMTG, were prepared via solid-state reaction method. The ceramics exhibited excellent microwave dielectric properties, high compressive strength, and significantly lower thermal conductivities compared to pure SrLaAlO4 and other perovskite ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Zhihao Lou, Xin Xu, Ping Zhang, Lingyun Gong, Qian Chen, Jie Xu, Artur Rydosz, Feng Gao
Summary: Entropy engineering has been applied to synthesize a series of high-entropy dielectric ceramics, and the influence of mixing entropy on phase stability and dielectric properties has been investigated. The introduction of tetravalent cations can induce distortion of oxygen octahedron and antiparallel cation displacement, leading to excellent dielectric performance and stability. This research provides valuable insights for entropy engineering to control dielectric properties and phase stability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Wenju Xu, Mengde Liao, Xiaohong Liu, Li Ji, Pengfei Ju, Hongxuan Li, Huidi Zhou, Jianmin Chen
Summary: High entropy ceramics films were deposited on Inconel 718 alloys using multi-arc ion plating equipment with different nitrogen flow ratios, affecting the microstructure, mechanical properties, and tribological properties of the films. The films exhibited varying structures and characteristics depending on the nitrogen flow ratio, with higher ratios resulting in improved wear resistance and lower wear rates.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Chenhe Zhou, Xiaoyan Zhang, Shuning Li, Jinhua Yan, Xiwei Qi
Summary: A series of high-entropy perovskite ceramics with excellent dielectric properties and energy storage efficiency were successfully synthesized, suggesting entropy engineering as a viable strategy for tailoring material properties.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Christian Pithan, Ho-Yun Lee, Ming-Yuan Yeh, Ying-Chieh Lee, Detlev F. Hennings
Summary: Ba0.45Mg0.05Sr0.5-xCaxTiO3 (BMSCT) high entropy ceramics were prepared by a solid-state reaction process sintered at temperatures ranging from 1250 degrees C to 1400 degrees C. The Ca content significantly affected the crystalline phase and dielectric properties of the BMSCT ceramics. High resolution TEM observations showed a large number of intragranular disorder and disturbance on the nanoscale. Mg doping shifted the Curie point to-50 degrees C, while Ca-substitution (up to 10 at.%) led to a broad phase transition and a Curie point of-30 degrees C. Comparing the dielectric constant at 1 MHz and 1 GHz, the permittivity of BMSCT-9182 was slightly lower than that at low frequency (-6%), while for BST it was drastically decreased (-70%) at microwave frequencies.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Ming Xia, Yongxiong Chen, Baolong Shen, Xiubing Liang
Summary: High-entropy ceramics (HECs) are refractory materials with unique microstructures and superior properties. This study successfully fabricated two HECs using vacuum arc melting technique and analyzed their phase evolution and microstructure. The experimental results showed that these HECs exhibited excellent hardness and toughness, expanding their potential applications in protective coatings, high temperature structure parts, and machining tools. The study provides a new approach for preparing bulk HECs and guidance for further development.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Ceramics
Yongsen Luo, Hua Hao, Dongxu Li, Qinghu Guo, Minghe Cap, Zhonghua Yao, Hanxing Liu
Summary: Y2O3-doped ST-LA microwave dielectric ceramics were prepared using a conventional solid-state reaction. The addition of Y2O3 did not significantly affect the phases, resulting in dense and uniform microstructures. The doping amount of Y2O3 had a substantial impact on the dielectric properties. The 0.3 wt%Y2O3-doped ceramics exhibited excellent microwave dielectric properties, indicating potential applications in fifth-generation communication.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Chengyang Zuo, Shilin Yang, Zhiqin Cao, Wenjing Jie, Xianhua Wei
Summary: High-entropy dielectric ceramics show promising potential for energy storage applications. Conventional solid-state reaction (SSR) synthesis method often leads to unsatisfactory performance of high-entropy dielectrics. In this study, high-entropy (Sr0.6Bi0.2Na0.2)(Ti1-xZrx/2Alx/4Nbx/4)O3 ceramics were synthesized using a solution combustion synthesis (SCS) method. The SCS fabricated ceramics (x = 0.25) exhibited superior energy storage properties compared to SSR-prepared samples, attributed to the absence of impurity phases and the refined submicrometer grain size in the SCS fabricated high-entropy ceramics. This research provides a facile approach for high-performance high-entropy dielectric ceramics fabrication, highlighting the advantages of the SCS technique.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Wuyou Sun, Fan Zhang, Xue Zhang, Tong Shi, Jinrui Li, Yu Bai, Chao Wang, Zhanjie Wang
Summary: In this study, (Bi0.2Na0.2Ba0.2Ca0.2Sr0.2)TiO3 (BNBCST) high-entropy ceramics (HECs) were prepared using hydrothermal-synthesized powders. It was found that BNBCST exhibited great chemical homogeneity and a single tetragonal phase due to the chemical element disorder at the A site, leading to lattice distortion and enhanced dielectric relaxation and energy storage performance. The study highlights the potential of hydrothermal powder preparation in fabricating high-entropy ferroelectric ceramics, with BNBCST being a viable alternative for electrical energy storage applications.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Hongsong Zhang, Liming Zhao, Weiwei Sang, Xiaoge Chen, An Tang, Haoming Zhang
Summary: A novel high-entropy oxide of (La1/6Nd1/6Yb1/6Y1/6Sm1/6Lu1/6)(2)Ce2O7 was prepared with a typical fluorite-type lattice structure and particle sizes in the range of 30-100 nm; due to its low lattice order, it exhibits a higher thermal expansion coefficient and excellent lattice stability at high temperature; influenced by lattice distortion, it has a lower thermal conductivity compared to other oxides.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Mingjun Xie, Xiao Li, Yuanming Lai, Cong Qi, Jun Yin, Weiping Gong, Yuanxun Li, Qian Liu, Chongsheng Wu
Summary: “In this study, high-entropy spinel-type ceramics were synthesized and their microwave dielectric properties were investigated. The high-entropy ceramics exhibited good dielectric performance, which was influenced by factors such as sintering temperature, lattice distortion, and grain size.”
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Haowen Liu, Ateer Bao, Jun Zhang, Yaohang Gu, Xiaoyan Zhang, Xiwei Qi
Summary: A new kind of high-entropy rare earth garnet ceramics was successfully synthesized by solid state reaction. The increase of Al content leads to the decrease of relative dielectric constant and the increase of dielectric loss. The activation energies of grain boundary and grain electrical conductivities indicate that the difference between them enhances the dielectric properties. These findings provide important insights for the study of colossal dielectric materials.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Jia Liu, Cuiying Ma, Xing Zhao, Ke Ren, Ruiying Zhang, Furong Shang, Huiling Du, Yiguang Wang
Summary: High-entropy (1-x) BNKBCT-xBT ceramics with various doping concentrations of BT were successfully prepared and showed promising energy storage properties. The XRD and Raman analyses revealed a pseudo-cubic phase structure for all samples. The as-prepared ceramics exhibited a relaxor ferroelectric behavior due to the increase in lattice disorder and the thermal evolution of polarization units. The increase in ΔP and the high Wrec values indicated the potential of these ceramics for energy storage applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
