Article
Chemistry, Multidisciplinary
Nateeporn Thongyong, Prasit Thongbai, Pornjuk Srepusharawoot
Summary: The origins and mechanisms of dielectric responses in co-doped TiO2 materials with Ni2+ and Nb5+ were explored through theoretical and experimental investigations. The introduction of oxygen vacancies by Ni2+ doping and the generation of free electrons by Nb5+ doping resulted in the formation of complex defect dipoles that contributed to the dielectric responses. Experimental results showed a significant dielectric response at room temperature due to the presence of defect dipoles and grain boundary/surface barrier layer capacitor effects, which increased with higher doping levels. However, in a temperature range where the grain boundary/surface barrier layer effects were suppressed, the dielectric response decreased with increased doping.
Article
Chemistry, Physical
Jiangtao Fan, Gang He, Zhenzhu Cao, Yongfan Cao, Zhen Long, Zhanggui Hu
Summary: Through the synthesis of a system of acceptor Gd3+ and donor Ta5+ co-doped (Gd0.5Ta0.5)xTi1-xO2 (GTTOx, x = 0, 0.01, 0.02, 0.04, 0.06) ceramics, dielectric response is enhanced. A colossal permittivity (CP, 2.65 x 104@1 kHz, 2.37 x 104@1 MHz), a very low dielectric loss (tano, 0.007@1 kHz, 0.03@1 MHz), good stability of frequency (20-106 Hz) and temperature (RT-250 degrees C, D epsilon 0 (T)/epsilon 030 < +/- 15%, at 1 kHz) were achieved simultaneously in GTTO0.01 ceramic. The main reasons for the improved dielectric properties are the synergistic effect of the electron pinning defect-dipole (EPDD) model, the internal blocking layer capacitance (IBLC) mechanism, and electrode response. This work provides a promising approach for the design of defect-related high-performance giant dielectric ceramics.
JOURNAL OF MATERIOMICS
(2023)
Article
Biochemistry & Molecular Biology
Nateeporn Thongyong, Narong Chanlek, Pornjuk Srepusharawoot, Prasit Thongbai
Summary: The Mg2+/Ta5+ codoped rutile TiO2 ceramic exhibited high dielectric permittivity and low loss tangent, with the properties being recoverable to the initial values through annealing. The giant dielectric properties were attributed to insulating grain boundaries and insulative surface layer effects.
Article
Materials Science, Ceramics
Jinqiu Liu, Yuechan Song, Wenwen Wu, Xingang Wang, Quan Zhou, Gaoyun Niu, Peng Liu
Summary: A series of textured ceramics with different compositions were sintered in a nitrogen environment after magnetic slip casting. The textured ceramics exhibited high permittivity, low dielectric loss, and suitable temperature coefficient, which make them suitable for electronic devices and high-density energy storage. The microstructure evolution of the sintered ceramics under a magnetic field led to improved dielectric properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Theeranuch Nachaithong, Narong Chanlek, Pairot Moontragoon, Pornjuk Srepusharawoot, Prasit Thongbai
Summary: Ti1-x(Co1/3Ta2/3)xO2 ceramics prepared by a mixed oxide method exhibit low dissipation factor and excellent temperature stability, with high dense sintered-ceramics having low tan delta of 0.015-0.043 and high dielectric permittivities of 7.0-9.1 x 104 at 1 kHz. The microstructure of the ceramics shows homogeneous distribution of the dopants. Impedance spectroscopy reveals the electrically heterogeneous microstructure and the contributions of intrinsic and extrinsic factors to dielectric relaxations. The high permittivity is attributed to intrinsic defect dipoles and extrinsic internal barrier layer capacitor (IBLC) effects, while the low tan delta is primarily caused by the IBLC effect associated with high resistance and defect dipoles.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Ceramics
Tiantian Li, Wenjun Cao, Jinsong Wang, Yingtang Zhang, Chunchang Wang
Summary: (In + Nb)-doped Cex(In0.5+Nb0.5)1-xO2 (with x = 0, 0.005, 0.05, and 0.1) ceramics were prepared using a conventional solid-state method. The dielectric properties of the ceramics were studied at temperatures ranging from 3 to 475 K and frequencies ranging from 102 to 106 Hz. All doped samples exhibited a colossal permittivity behavior, with the sample at x = 0.005 showing the best frequency stability. Two thermally activated relaxations contributed to the colossal permittivity behavior: a low-temperature polaron relaxation (R1) caused by electron hopping between Ce3+ and Ce4+ ions, and a high-temperature dipole relaxation (R2) caused by the oxygen-vacancy-dopant defect pair.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Xiaohua Zhou, Peng Ni, Hongyu Yang, Hua Wang, Bin Tang, Shuren Zhang
Summary: In this study, single-phase MgZr1-x(Mg1/3Ta2/3)(x)Nb2O8 ceramics with monoclinic wolframite structure were synthesized by the traditional solid-state method. The effects of (Mg1/3Ta2/3)(4+) substitution for Zr4+ on phase composition, microstructure, packing fractions, bond valences, and microwave dielectric properties were investigated comprehensively. The results showed that the introduction of (Mg1/3Ta2/3)(4+) ions led to improvements in Q x f values due to increased packing fractions, but excessive substitution resulted in increased porosity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
Lei Wang, Xudong Liu, Mu Zhang, Xiaoguo Bi, Zhixin Ma, Jinsheng Li, Jialin Chen, Xudong Sun
Summary: (Nb0.5Ga0.5)(x)Ti1-xO2 single crystals with different doping amounts were prepared by Verneuil method. The crystals showed varying dielectric performance, with the best dielectric properties achieved at a doping amount of 0.5%. The colossal permittivity properties were attributed to EPDD polarization, and higher doping concentrations led to slight increases in dielectric loss. The results highlight the significance of TiO2 crystal materials with lower dielectric loss for the development of dielectric materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Yasumin Mingmuang, Narong Chanlek, Viyada Harnchana, Prasit Thongbai
Summary: This study investigates the effects of Sn4+ doping concentration on the crystal structure, microstructure, dielectric behavior, and electrical properties of SnxTa(0.025)Ti(0.975-x)O(2) ceramics. It is found that adjusting the Sn4+ doping concentration can improve the dielectric properties of co-doped TiO2.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Xiao-gang Zhao, Lin Chen, Xiang-yu Zhang, Peng Liu, Chun-Long Xu, Zhao-Yang Hou, Zhen Wang, Feng-Long Wang, Jin-Guo Wang, Gang Shi
Summary: Al3+ and Nb5+ co-doped rutile TiO2 ceramic samples were prepared by solid state reaction, showing colossal permittivity with abnormal multiple dielectric relaxation properties. The high dielectric constant is attributed to thermal activation of electrons, polaron hopping polarization, and interfacial polarization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Zhi Wu, Yifei Liu, Jing Zhou, Hong Zhao, Zhihui Qin
Summary: This paper investigates the effects of heterogeneous interfaces on the dielectric behavior and temperature stability of Ba(Mg1/3Ta2/3)O-3/PbZr0.52Ti0.48O3 (BMT/PZT) thin films, and finds that the presence of heterogeneous interfaces can improve the film's performance and expand its applications.
Article
Materials Science, Ceramics
Wei Zhou, Minghe Cao, Hongye Wang, Hua Hao, Zhonghua Yao, Hanxing Liu
Summary: In this study, TiO2 ceramics doped with titanium powder were prepared using a solid-state reaction in an Ar atmosphere, exhibiting colossal permittivity and low dielectric loss over a wide frequency and temperature range. The addition of titanium metal powder successfully reduced Ti4+ to Ti3+, while the high-temperature inert atmosphere created oxygen vacancies and promoted the formation of defect clusters with Ti3+- V-o - Ti3+ as the core. The polarization and local confinement of the defect clusters resulted in the colossal permittivity and low dielectric loss. This work provides important insights and new ideas for the design of correlated defects in colossal permittivity materials.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Porntip Siriya, Narong Chanlek, Pornjuk Srepusharawoot, Viyada Harnchana, Prasit Thongbai
Summary: A triple-doped (Ga1/2Nb1/2)(0.1)Ti0.9O2 ceramic with acceptor-donor co-doping of Al3+ exhibits improved giant dielectric properties. The ceramic shows homogeneous dispersion of all dopants inside the grains and partially segregated dispersion of Ga3+ along the grain boundaries. The improved dielectric properties are attributed to internal and surface barrier-layer capacitor effects produced by the Ga3+ and Al3+ dopants, respectively, and semiconducting grains resulting from Nb5+ doping ions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Physics, Condensed Matter
G. Hassnain Jaffari, M. Akram, Layiq Zia, Awais Ali, Qadeer ul Hassan
Summary: Colossal permittivity with low loss tangent has been achieved by co-substitution of Zn and Nb in TiO2. The incorporation of divalent and pentavalent ions has been confirmed by structural and Raman spectroscopic analysis. Specific ratio of acceptor-donor pairs has led to observation of colossal permittivity with a low loss tangent. Evidence of localized donor electrons in the dielectric response shows the generation of electron pinned defect dipoles.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Materials Science, Coatings & Films
Yupeng Cao, Xianjin Ning, Quansheng Wang
Summary: The thermal shock performance of BMT-YSZ coatings was superior to that of single-layer BMT coatings, and the addition of YSZ in the BMT layer effectively increased the fracture toughness of the coatings in the BMT/20 wt% YSZ-YSZ composite double-ceramic-layer structure.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Hongchen Sun, Ran Xu, Xiaozhi Wang, Qingshan Zhu, Yu Lan, Mengjiao Wang, Xiaoyong Wei, Yujun Feng, Zhuo Xu, Xi Yao
Summary: By adding the BASK glass phase into PLSZST ceramics, the sintering temperature was reduced, and high recoverable energy density and efficiency were achieved, making it suitable for pulsed power electronic devices.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Qingyuan Hu, Huimin Liao, Xin Liu, Li Jin, Kexin Song, Yongyong Zhuang, Zhuo Xu, Vladimir Ya Shur, Xiaoyong Wei
Summary: In this study, a thermal annealing and high temperature poling approach is proposed to enhance the piezoelectricity of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 crystals. The manipulation of defects and defect polarization orientation results in a more polarized crystal. The improved piezoelectric property achieved under a maintained Curie temperature indicates the feasibility of the approach.
JOURNAL OF MATERIOMICS
(2023)
Article
Materials Science, Ceramics
Fangbin Wei, Yule Yang, Leiyang Zhang, Denis Alikin, Vladimir Shur, Amei Zhang, Hongliang Du, Xiaoyong Wei, Li Jin
Summary: High recoverable energy storage density (W-rec) and high energy storage efficiency (eta) are urgently needed for their potential application in pulse capacitor devices. However, low eta and breakdown strength (BDS) have hindered the achievement of high W-rec at high electric field. In this study, Bi(Mg0.5Ti0.5)O-3 (BMT) was introduced into Ba(Ti0.92Sn0.08)O-3 (BTS) matrix to enhance the relaxor character and reduce electrostrictive strain. The results showed significantly improved BDS and a high W-rec of 4.34 J/cm(3) with excellent temperature stability.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Wen-Jing Shi, Lei-Yang Zhang, Yu-Le Yang, D. O. Alikin, V. Ya. Shur, Xiao-Yong Wei, Hong-Liang Du, Li Jin
Summary: Lead-free dielectric ceramics with improved energy storage performance (ESP) were developed using a combinatorial optimization strategy. By introducing Bi-containing complex ions and employing a viscous polymer process, the ceramics exhibited enhanced diffuse phase transition, increased bond coupling, and reduced hysteresis. The optimized composition achieved high recoverable energy storage density (W-rec), high efficiency, and remarkable temperature stability for pulsed power capacitors.
Article
Chemistry, Physical
Wen Wang, Leiyang Zhang, Yule Yang, Wenjing Shi, Yunyao Huang, D. O. Alikin, V. Ya. Shur, Zhihao Lou, Amei Zhang, Xiaoyong Wei, Dong Wang, Feng Gao, Hongliang Du, Li Jin
Summary: This study achieved comprehensive exceptional energy storage performance in Na0.5Bi0.5TiO3-Sr0.85Bi0.1TiO3 (NBT-SBT)-based ceramics through stepwise optimization by substituting Bi(Mg0.5Sn0.5)O-3 (BMS) and optimizing the formation process. The introduction of Mg2+ and Sn4+ ions at the B-site induced polar nanoregions, and the viscous polymer process (VPP) improved the polarization difference and breakdown strength. As a result, the ceramics exhibited ultrahigh energy storage density and high efficiency, along with excellent temperature adaptability.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Nanoscience & Nanotechnology
Dirui Wu, Wen Dong, Ying Yang, Long Chen, Wenrong Xiao, Chao Zhang, Kailun Zou, Wenjing Zhou, Wei Luo, Guangzu Zhang, Qiuyun Fu, Shenglin Jiang
Summary: Forming defect-dipole clusters by A-B site acceptor-donor co-doping in antiferroelectrics can comprehensively enhance the energy storage performance. La and Mn co-doping in an equal amount can significantly improve the overall energy storage performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Xiyu Ma, Wenjing Shi, Yule Yang, D. O. Alikin, Y. Ya Shur, Jinghui Gao, Xiaoyong Wei, Gang Liu, Hongliang Du, Li Jin
Summary: Electrocaloric refrigeration is an emerging solid-state technology with advantages of high efficiency, miniaturization, eco-friendliness, and low cost. This paper investigates Ba(Ti1-xSnx)O-3 ceramics and reveals their structural, dielectric, ferroelectric, electrocaloric, and electrostrictive characteristics. The results show that increasing Sn4+ concentration leads to lower dielectric peaks and a phase diagram is constructed based on dielectric characteristics. The study also demonstrates a giant adiabatic temperature change of 6.36 K in the x = 0.04 ceramic sample and temperature and composition-insensitive electrostrictive behavior.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Leiyang Zhang, Mo Zhao, Yule Yang, Yang Li, Mingyang Tang, Dong Wang, Xiaoyong Wei, Gang Liu, Yan Yan, Li Jin
Summary: This article introduces a novel method to regulate polar nanoregions (PNRs), aiming to achieve both ultra-high recovered energy density (Wrec) and ultra-high efficiency (eta) in (Na0.5Bi0.5)TiO3 (NBT)-based relaxor ferroelectric ceramics. The study provides insights for developing alternative lead-free dielectric ceramic materials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Syedul Hasnain Bakhtiar, Wen Dong, Bingxiao Xue, Long Chen, Mei Wang, Guangzu Zhang, Wei Luo, Shenglin Jiang, Qiuyun Fu
Summary: By using a modified co-precipitation route with maleic acid-assisted freeze-drying, narrowly dispersed tetragonal BaTiO3 (BTO) nanoparticles with a mean size of around 170 nm and a high c/a ratio of 1.0109 were synthesized. The ultra-fine (around 44 nm) tetragonal BTO obtained through this approach exhibits better dispersibility compared to other methods. The as-obtained BTO-Fr-Gl-pH9-1400C ceramic pellet shows a high permittivity (>12,000) and low dielectric loss (0.03), making it promising for further scaling of BTO-based multilayer chips.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Optics
Liu Yang, Yongyong Zhuang, Yifan Zhang, Yaojing Zhang, Shuangyou Zhang, Zhuo Xu, Pascal Del'Haye, Xiaoyong Wei
Summary: In this study, a method to achieve an electromagnetically induced transparency (EIT)-like effect in a whispering gallery mode resonator (WGMR) was proposed and experimentally validated in a lithium niobate (LN) device. The method utilized the electro-optic and inverse piezoelectric effects of LN to tune two modes of the LN WGMR at different rates, resulting in EIT-like resonance lineshapes. The electric field applied to the LN WGMR allowed precise control of the dynamic behavior of the EIT-like phenomenon. The proposed method and demonstrated devices offer potential applications in light storage, quantum information processing, and enhanced sensing techniques.
PHOTONICS RESEARCH
(2023)
Article
Materials Science, Ceramics
Xu Guo, Jingrui Kang, Yi Tang, Rui Gu, Honglei Hao, Jiahui Wang, Li Jin, Xiaoyong Wei
Summary: In this study, single-doped donor ions are used to reduce the dielectric loss of Ni1-8O ceramic. The results show that with the doping of Ti ions, the grain size decreases and the dielectric loss decreases significantly. The presence of secondary phase and charge compensation effect are proposed to be responsible for the reduced dielectric loss. This work provides insights into the optimized dielectric properties and mechanism of Ni1-8O ceramics, and promotes the development of colossal permittivity materials.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Qingyuan Hu, Denis Alikin, Boris Slautin, Anton Turygin, Xin Liu, Pengfei Li, Yuebin Zhang, Dabin Lin, Kexin Song, Yongyong Zhuang, Zhuo Xu, Pavel Zelenovskiy, Vladimir. Ya. Shur, Xiaoyong Wei
Summary: The domain structure and surface screening charges during phase transitions in the (001) oriented 0.72PMN-0.28PT crystal were investigated at the nanoscale using piezo-response force microscopy (PFM) and Kelvin probe force microscopy (KPFM). Electric field induced phase transitions were studied locally with confocal polarized Raman spectroscopy. It was found that PFM tip bias poling can induce a rhombohedral to monoclinic phase transition in the 0.72PMN-0.28PT single crystal, and the monoclinic phase relaxes back to the rhombohedral phase at elevated temperatures. This study provides valuable insights into the electric field induced phase transition and its practical applications for PMN-PT single crystals.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Meirong Zhang, Bofeng Zhu, Xiao Zhang, Zhenxue Liu, Xiaoyong Wei, Zhicheng Zhang
Summary: Polymer-based dielectrics, such as biaxially oriented polypropylene (BOPP), have limitations in achieving high energy density due to low permittivity. To address this issue, electron-deficient vinyl quinoline (VQQ) units were copolymerized with methyl methacrylate (MMA) and blended with a PMMA matrix. This strategy successfully increased energy discharging efficiency and obtained a higher energy density. This work provides a promising approach for commercial application of high energy density and low loss polar polymer dielectrics in energy storage capacitors.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Physical
Alexander S. Krylov, Svetlana N. Krylova, Alexander N. Vtyurin, Eugene M. Roginskii, Li Jin, Ye Tian, Xiaoyong Wei
Summary: The temperature behavior of 0.955 AgNbO3-0.045 LiTaO3 and AgNbO3 ceramics was investigated using Raman spectroscopy in the temperature range from 10 to 415 K. Ab initio calculations were conducted to interpret the Raman spectra of AgNbO3 in the Pmc2(1) phase using three potentials (A-PZ, PBE, and PBEsol). The peculiarities in the Raman spectra of AgNbO3 ceramics were observed and explained. The differences in the spectra between 0.955 AgNbO3-0.045 LiTaO3 and AgNbO3 ceramics were demonstrated, and the temperature of structural changes in both ceramics were discussed.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Syed Ul Hasnain Bakhtiar, Pu Ai, Wen Dong, Qi Ma, Junlei Zhao, Guanqun Shi, Fengjun Yan, Ling Miao, Guangzu Zhang, Shenglin Jiang, Wei Luo, Mengyuan Hua, Qiuyun Fu
Summary: This article investigates the influence of defects on the magnetic properties of diluted magnetic semiconductors. The results show that the clustering effect of defects determines the magnetic order, and the distance between two defects and the position of oxygen vacancies play important roles in altering the magnetic properties.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)