Article
Materials Science, Ceramics
Yiwang Chen, Yu Zeng, Wei Cao, Nan Chen, Guoping Du
Summary: Sr(Li1/4Nb3/4)xTi(1-x)O3 (0.000 < x < 0.04) (STLN) ceramics were synthesized via a solid-state reaction under a flowing nitrogen atmosphere. Co-doping with Li+ and Nb5+ considerably enhanced the dielectric properties of SrTiO3 ceramics. The STLN ceramic with x = 0.012 exhibited a colossal permittivity and low dielectric loss, which can be attributed to the formation of defect dipoles and defect-dipole clusters, as well as the high grain boundary resistance.
CERAMICS INTERNATIONAL
(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
Engineering, Electrical & Electronic
Quan Ding, Hua Hao, Fang Wang, Kangchuang Li, Zhonghua Yao, Minghe Cao, Hanxing Liu
Summary: Ba(0.5-1.5x)Sr0.5LaxTiO3(x = 0.005,0.01,0.015,0.02) ceramics were synthesized in N-2 atmosphere by solid state reaction method. All samples exhibited a cubic perovskite phase. The sample with x = 0.01 showed a relative dielectric constant of 115,648 at 1000 Hz and 25 °C, with a low dielectric loss of less than 0.04 and a relatively high dielectric temperature stability in the range of 25-250 °C. Annealing the same sample in air caused a decrease in dielectric constant and an increase in dielectric loss, accompanied by two sets of dielectric loss peaks. The relaxation behavior was attributed to the thermal motion of oxygen vacancy and its defective dipole, providing a reference for future studies on dielectric properties of modified materials.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Ceramics
Xiang Niu, Xiaodong Jian, Xianyi Chen, Haoxuan Li, Wei Liang, Yingbang Yao, Tao Tao, Bo Liang, Sheng-Guo Lu
Summary: Doping manganese ions in (BaSr)TiO3 (BST) ceramics can lead to high permittivity and low dielectric losses, improving the performance of the materials. The Ba0.6Sr0.4Mn0.001Ti0.999O3 sample exhibited a maximum electrocaloric effect of 2.75 K in temperature change at approximately 21 degrees C and 50 kV/cm, making it a promising ECE material for practical refrigeration devices operating at room temperature.
JOURNAL OF ADVANCED CERAMICS
(2021)
Article
Chemistry, Multidisciplinary
Lei Wang, Xudong Liu, Jinsheng Li, Mu Zhang, Xiaoguo Bi, Zhixin Ma, Jialin Chen, Xudong Sun
Summary: High-performance dielectric materials are crucial for electronic devices. This study prepared RE-doped SrTiO3 (RE = La, Nd, Yb) single crystals with excellent dielectric properties using the Verneuil method. The dielectric properties were found to be closely related to oxygen vacancies, with Yb-STO showing the best properties due to the partial replacement of Ti4+ by Yb3+. N-2 atmosphere treatment further enhanced the dielectric properties by promoting the production of oxygen vacancies and Ti3+ and increasing the formation of defect dipoles.
Article
Materials Science, Ceramics
Xu Guo, Jingrui Kang, Rui Gu, Honglei Hao, Yi Tang, Li Jin, Xiaoyong Wei
Summary: In this work, Ti1-x(Tm0.5Nb0.5)xO2 (TTNOx) ceramics were prepared via the solid state method, and low dielectric loss and colossal permittivity were achieved through defect regulation. This study has important implications for the application of colossal permittivity ceramic materials.
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
Jiangtao Fan, Zhen Long, Haitao Zhou, Gang He, Zhanggui Hu
Summary: (Tm+Nb) co-doped TiO2 ceramics were prepared and their phase, microstructure, and dielectric properties were investigated. The ceramics with a co-doping concentration of 0.01 exhibited ultralow dielectric loss and colossal permittivity, showing excellent temperature and frequency stability in a certain range. The dielectric properties of the ceramics were influenced by several factors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Tiantian Yang, Jiyan Liang
Summary: A novel (Ta1-xPrx)0.03Ti0.97O2 ceramic was fabricated using an efficient defect engineering strategy and solid-state reaction method. The ceramic displayed excellent electrical properties, including temperature stability and giant dielectric properties, making it a potential candidate for capacitors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Yingzhi Meng, Kang Liu, Xiuyun Zhang, Xiuyun Lei, Jun Chen, Zhao Yang, Biaolin Peng, Changbai Long, Laijun Liu, Chunchun Li
Summary: This study investigated the colossal-permittivity behavior in rare-earth doped BaTiO3 ceramics and identified the coupling of point defects as well as the effects of internal barrier layer capacitance and surface barrier layer capacitor. The study highlights the potential applications of these materials in the miniaturization of electronic components and high-energy storage.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Jinghan Gao, Wenfeng Liu, Lei Zhang, Fanyi Kong, Yi Zhao, Shengtao Li
Summary: In this study, a semi-solution method was used to enhance the dielectric and ferroelectric properties of acceptor-donor co-doped BaTiO3 ceramics, achieving higher peak dielectric constant and maximum polarization with less apparent aging phenomena. Microscopic analysis revealed that the property enhancement was attributed to the control of compositional homogeneity and oxygen vacancies.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Qianwei Huang, Zibin Chen, Matthew J. Cabral, Haosu Luo, Hongwei Liu, Shujun Zhang, Yulan Li, Yiu-Wing Mai, Simon P. Ringer, Xiaozhou Liao
Summary: The study investigates the impact of introducing dislocation loops via electron beam on the motion of ferroelectric domain walls in ferroelectric nanoplates. It was found that defects caused by localized strain fields suppress the motion of domain walls, and the pinning effect can be enhanced by multiple domain walls embedded with defect arrays. This suggests the potential for manipulating domain switching in ferroelectric nanoplates using electron beams.
Article
Materials Science, Multidisciplinary
Noppakorn Thanamoon, Narong Chanlek, Pairot Moontragoon, Pornjuk Srepusharawoot, Prasit Thongbai
Summary: The study investigates the colossal permittivity (CP) properties of (Tb3+/4++Sb5+) co-doped TiO2 (TSTO) ceramics. The findings reveal the extremely high dielectric constant, low loss tangent, and temperature stability of the TSTO ceramics. The presence of grains, grain boundaries, and microwave dielectric phases in the TSTO ceramic determines its dielectric behavior. The study also explains the appearance of semiconducting grains induced by Ti3+ via X-ray photoelectron spectroscopy.
RESULTS IN PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Longhai Yang, Wenjie Gao, Jiaxing Wang, Chunxiang He, Gaili Yue, Tao Zhang
Summary: Li-doped Bi2/3Cu3Ti4O12 ceramics were successfully prepared, and the effect of Li doping on the crystal structure and dielectric properties was investigated. Li doping improved the dielectric constant and reduced the dielectric loss in the mid-frequency range. The dielectric response at different frequencies was found to originate from different regions within the ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Lin Zhou, Guoyan Yang, Dong Yang, Jinhua Xu, Zhanhui Peng, Di Wu, Lingling Wei, Pengfei Liang, Xiaolian Chao, Zupei Yang
Summary: Dense (Zn0.5W0.5)(x)Ti1-xO2 (ZWTO(x)) ceramics were prepared under nitrogen and oxygen atmospheres, displaying colossal permittivity and low loss in ZWTO(x)-N-2 ceramics due to interface polarization and disassociation between oxygen vacancies and trivalent titanium ions. Impedance analyses confirmed the electrical heterostructure nature of ZWTO(x)-N-2 ceramics. On the other hand, abnormal dielectric behaviors were observed in ZWTO(x)-O-2 ceramics due to the formation of Zn2+-W6+ ion pairs that disrupt the local lattice. This work provides a new defect engineering strategy for TiO2 and other CP materials.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Jianzhou Du, Xin Xiao, Duomei Ai, Jingjin Liu, Long Qiu, Yuansheng Chen, Kongjun Zhu, Luming Wang
Summary: Al2O3-based porous ceramic membrane tubes were prepared using extrusion molding and solid-phase sintering method, investigating the effects of grain size and sintering temperature. The study found relationships between porosity, density, and pore size, and analyzed the impact of porosity on pressure distribution and flow velocity.
Article
Materials Science, Ceramics
Jianzhou Du, Long Qiu, Xin Xiao, Xuesong Zhai, Luming Wang, Kongjun Zhu
Summary: This study systematically investigated the effect of PFN content on the microstructure and electrical properties of xPb(Fe0.5Nb0.5)O-3-(0.57-x)Pb(Ni1/3Nb2/3)O3-0.43Pb(Zr0.3Ti0.7)O-3. The results revealed that PFN diffuses into the perovskite lattice and forms a new quaternary solid solution. The proportion of the rhombohedral phase decreases gradually with the increase of PFN content, while the proportion of the tetragonal phase exhibits an opposite trend.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Guo-Qing Li, Min Yu, Hang Luo, Ze-Ya Huang, Ren-Li Fu, Francesco Gucci, Theo Saunders, Kong -Jun Zhu, Dou Zhang
Summary: To solve the problems in the production process of wood-derived C-SiC composites, such as low infiltration efficiency and poor mechanical properties, thermal modification of fir at low temperatures combined with sol-gel infiltration was used to produce biomorphic ceramics. The materials showed improved interfacial bonding and mechanical properties. The highest compressive strength and bending strength were observed in composites sintered at 1400 degrees C, while lower strengths were observed in composites sintered at 1600 degrees C due to excessive consumption of carbon. Thermal modification can promote slurry infiltration and improve the mechanical properties of the composites.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Jiatao Chen, Kongjun Zhu, Yu Rao, Penghua Liang, Jie Zhang, Hongjuan Zheng, Feng Shi, Kang Yan, Jing Wang, Jinsong Liu
Summary: Ingenious morphology design and doping engineering significantly enhance the conductivity and reduce the volume expansion of transition metal oxides as anode materials for lithium-ion batteries. In this study, S-0.15-Fe2O3@C nano-spindles with a hierarchical porous structure were synthesized through carbonization and S-doping. The S-doping increases capacitive contribution, charge transfer capability, and Li+ diffusion rate, leading to the superior lithium storage performance of the S-0.15-Fe2O3@C electrode with high specific capacity, ultrahigh rate capability, and excellent cycling stability. The strategy can be extended to other metal oxides for high-rate capability and low volume expansion anodes.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Jie Zhang, Yu Wang, Kongjun Zhu, Penghua Liang, Yu Rao, Jiatao Chen, Hongcheng Li, Hongjuan Zheng, Jinsong Liu, Jing Wang, Kang Yan
Summary: In this study, a hierarchical micro-nano hydrangea-like NiCo2O4/V2O3 composite array (NCO/VO) was prepared on a nickel foam substrate as a free-standing anode for lithium-ion batteries (LIBs) using a facile one-step hydrothermal method combined with heat treatment. The introduction of V2O3 to form a composite structure with NCO improved the electronic and ionic conductivity of the electrode. The synergistic effect of porosity, composite structure, and micro-nano architecture resulted in excellent electrochemical performance of the electrode. The as-prepared electrode exhibited a specific capacity of 1155.6 mA h g-1 after 200 cycles at a current density of 100 mA g-1, with a retention ratio of 91.02%. At a higher current density of 1000 mA g-1, it delivered a specific capacity of 750 mA h g-1, demonstrating excellent rate performance. This work highlights NCO/VO-NF as a promising candidate anode for next-generation LIBs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Penghua Liang, Kongjun Zhu, Jiatao Chen, Yu Rao, Hongjuan Zheng, Jun Guo, Zhihan Kong, Jie Zhang, Jinsong Liu, Kang Yan, Jing Wang
Summary: In this study, the researchers demonstrated the co-modification of oxygen vacancies and heterojunctions in VO2(B) (VO-VO2/MXene) as a cathode material for zinc-ion batteries (ZIBs). They found that the combination of VO-VO2 with MXene introduces an interfacial electric field, resulting in synergistic enhancement in electrochemical activity. The VO-VO2/MXene composite exhibited high specific capacity and excellent cycling lifespan for ZIBs. This work provides a reliable strategy for the co-modification of metal oxide electrodes with oxygen vacancies and heterostructures.
JOURNAL OF POWER SOURCES
(2023)
Correction
Multidisciplinary Sciences
Jie Lv, Shu Meng, Qilin Gu, Rongbin Zheng, Xinlei Gao, Jun-dae Kim, Min Chen, Bo Xia, Yihan Zuo, Sen Zhu, Dongyu Zhao, Yanqiang Li, Guangyu Wang, Xin Wang, Qingshu Meng, Qi Cao, John P. Cooke, Longhou Fang, Kaifu Chen, Lili Zhang
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Jie Lv, Shu Meng, Qilin Gu, Rongbin Zheng, Xinlei Gao, Jun-dae Kim, Min Chen, Bo Xia, Yihan Zuo, Sen Zhu, Dongyu Zhao, Yanqiang Li, Guangyu Wang, Xin Wang, Qingshu Meng, Qi Cao, John P. Cooke, Longhou Fang, Kaifu Chen, Lili Zhang
Summary: A comprehensive understanding of the lineage specification of endothelial cells is crucial for cardiovascular regenerative medicine. Recent studies have revealed the preferential regulation of cell identity genes by unique epigenetic signatures. In this study, we investigated the epigenetic landscape of endothelial cell lineage and identified MECOM as a key regulator.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Xijuan Li, Hongjuan Zheng, Yulong Wang, Xia Li, Jinsong Liu, Kang Yan, Jing Wang, Kongjun Zhu
Summary: Pure TiO2 and 3% Y-doped TiO2 were prepared through hydrothermal method, and then reduced TiO2 and 3% Y-TiO2 were obtained by thermal conversion treatment. The synergistic effect of Y doping and TiO2 reduction was observed, leading to enhanced photocatalytic performance. The improvement was attributed to expanded light absorption range and reduced charge recombination rates caused by Y doping, as well as the disordered shells filled with oxygen vacancies and Ti3+ resulting from reduction treatment. This discovery provides a new perspective for modifying photocatalytic materials and improving their performance.
Article
Chemistry, Multidisciplinary
Xia Li, Hongjuan Zheng, Jingjin Liu, Hongcheng Li, Jing Wang, Kang Yan, Jingsong Liu, Feng Dang, Kongjun Zhu
Summary: BaTiO3/CeO2 nanoparticles with heterogeneous structure were successfully synthesized using a gel-assisted hydrothermal method. The particle sizes decreased and the surface became rough when the molar ratio of Ti/Ce was adjusted. The main body and surface of the nanoparticles were speculated to be BaTiO3 and CeO2 protrusions, respectively. The BaTiO3/CeO2 nanoparticles with a Ti/Ce molar ratio of 0.875:0.125 exhibited the strongest catalytic ability when light irradiation and ultrasonication were applied simultaneously.
Article
Chemistry, Analytical
Penghua Liang, Kongjun Zhu, Yu Rao, Hongjuan Zheng, Zhihan Kong, Jiatao Chen, Jinsong Liu, Kang Yan, Jing Wang
Summary: Freestanding H2V3O8/MXene film with good electrical conductivity and flexibility was synthesized using high temperature mixing hydrothermal method and coating method. The film exhibited excellent electrochemical properties when used as cathode material for aqueous zinc ion batteries and solid-state zinc ion batteries.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Yu Rao, Kongjun Zhu, Guoliang Zhang, Feng Dang, Jiatao Chen, Penghua Liang, Zhihan Kong, Jun Guo, Hongjuan Zheng, Jie Zhang, Kang Yan, Jinsong Liu, Jing Wang
Summary: A hybrid structure of MoS2/V2O3@C-rGO was synthesized using a high-temperature mixing method, leading to superior Li+/Na+ storage performance due to the interface construction and carbon materials introduction.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zhihan Kong, Kongjun Zhu, Yu Rao, Penghua Liang, Jiatao Chen, Wei Wang, Chuanxiang Zhang, Jingsong Liu, Kang Yan, Jing Wang
Summary: Graphene and its derivatives, with their unique electroactive properties, have great potential in energy storage applications. In this study, nitrogen-doped reduced graphene oxide (N-rGO) nanoparticles were synthesized using a one-pot solvothermal method for supercapacitor applications. The N-rGO-based electrode exhibited excellent specific capacitance and stability.
Article
Chemistry, Physical
Jiatao Chen, Kongjun Zhu, Penghua Liang, Yu Rao, Xia Li, Hongjuan Zheng, Kang Yan, Jing Wang, Jinsong Liu
Summary: The carbon-coated anatase TiO2 doped with S (S-TiO2 @C) electrode, with high porosity and substantial carbon content, exhibits superior rate capability and long cycle life, providing a new strategy for optimizing the sodium storage capability of sodium-ion battery electrodes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jing Wang, Xuhui Fan, Zhen Liu, Kongjun Zhu, Hao Yuan, Zehan Zheng, Lei Zhao, Ji Zhang, Qibin Yuan, Jing-Feng Li
Summary: This study achieves high recoverable energy storage density and energy efficiency in lead-free AgNbO3-based ceramics through phase engineering and Bi-doping, making them promising for applications in advanced high-power electric and electronic devices.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
