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Start Over Author "Liu, Laijun" Journal ceramics international
42 results on '"Liu, Laijun"'

33. Frequency dependent electrocaloric effect in Nb-doped PZST relaxor thin film with the coexistence of tetragonal antiferroelectric and rhombohedral ferroelectric phases

Author

Peng, Biaolin, primary, Zhang, Miaomiao, additional, Tang, Silin, additional, Jiang, Jintao, additional, Zhao, Wenguang, additional, Zou, Bingsuo, additional, Luo, Nengneng, additional, Zhang, Qi, additional, Leighton, Glenn J.T., additional, Shaw, Christopher, additional, Liu, Laijun, additional, and Sun, Wenhong, additional

Published
2020
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40. Giant dielectric permittivity and non-linear electrical behavior in CaCu3Ti4O12 varistors from the molten-salt synthesized powder.

Author

Huang, Yanmin, Liu, Laijun, Shi, Danping, Wu, Shuangshuang, Zheng, Shaoying, Fang, Liang, Hu, Changzheng, and Elouadi, Brahim

Subjects
*TITANIUM oxides, *VARISTORS, *METAL powders, *COPPER oxide, *CRYSTAL structure, *METAL microstructure, *X-ray diffraction
Abstract

Abstract: CaCu3Ti4O12 (CCTO) powder has been prepared by a molten salt method using the NaCl–KCl mixture. Crystal structure and microstructure of the powder and the resulting ceramics have been characterized by using X-ray diffraction (XRD) and scanning electron microcopy (SEM). Impedance analyzer and current–voltage meter were employed to analyze dielectric and nonlinear (I–V) properties of the CCTO ceramics with different sintering durations and subsequent cooling rates. The values of dielectric permittivity and nonlinear coefficient of the quenched sample were found to be higher than those of the slowly cooled sample. More specifically, the cooling methods (quenching and furnace-cooling) have allowed to adjust; (і) the breakdown voltage within a rather low range of 0.3–4.4kVcm−1; (іі) the nonlinear coefficient between 2 and 6 and (ііі) the giant dielectric permittivity for the ceramics within a range from 5000 to 20000. A double Schottky barrier can be evidenced from the linear behavior between the ln J and E 1/2 in grain boundary regions. The relationship between the electrical current density and the applied electrical field indicates that the potential barrier height Φ B is holding time dependent. [Copyright &y& Elsevier]

Published
2013
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41. High-temperature dielectric and relaxation behavior of Yb-doped Bi0.5Na0.5TiO3 ceramics.

Author

Han, Feifei, Deng, Jianming, Liu, Xiaoqi, Yan, Tianxiang, Ren, Shaokai, Ma, Xing, Liu, Saisai, Peng, Biaolin, and Liu, Laijun

Subjects
*DIELECTRIC materials, *MICROSTRUCTURE, *YTTERBIUM compounds, *BISMUTH compounds, *DOPING agents (Chemistry)
Abstract

Microstructure, phase transition and dielectric properties of Yb-doped Bi 0.5 Na 0.5 TiO 3 (BNT) ceramics were investigated. It is found that ytterbium promotes the grain growth and densification of the ceramics while Ti-rich impurity appears due to the compensation of Ti-vacancy. The dielectric operational temperature range of the ceramics with a±15% tolerance was greatly broaden until 500 °C by ytterbium doping. Meanwhile, the diffuseness of the diffuse phase transition increases with the increase of doping Yb. BNT ceramics with 3 mol% Yb doping shows a near-plateau dielectric behavior in a broad temperature range from 147 to 528 °C and a low dielectric loss (<0.025) from 154 to 356 °C, indicating that it is a promising material for applications in high-temperature capacitor. [ABSTRACT FROM AUTHOR]

Published
2017
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42. Effects of Bi(Zn0.5Zr0.5)O3 addition on the structure and electric properties of BaTiO3 lead-free piezoelectric ceramics

Author

Chen, Xiuli, Wang, Yiliang, He, Fen, Zhou, Huanfu, Fang, Liang, and Liu, Laijun

Subjects
*BISMUTH compounds, *CRYSTAL structure, *ELECTRIC properties of metals, *LEAD-free ceramics, *PIEZOELECTRIC ceramics, *CHEMICAL reactions, *BARIUM titanate
Abstract

Abstract: (1−x)BaTiO3–xBi(Zn0.5Zr0.5)O3 [(1−x)BT–xBZZ, 0.01≤x≤0.09] lead-free piezoelectric ceramics were prepared by solid-state reaction method. The effects of Bi(Zn0.5Zr0.5)O3 addition on the crystal structure and electric properties of the BaTiO3 ceramics have been investigated. X-ray diffraction demonstrated that the samples exhibited a tetragonal to pseudocubic phase transition. The lattice parameters were found to increase with increasing the amount of BZZ content. Dielectric measurements revealed that the Curie temperature (T c ) shifted to higher temperature with increasing x. Furthermore, the ceramic with x=0.01 exhibited relatively good electrical properties with d 33=195pC/N, k p =17.7%, P r =14.5lC/cm2, and E c =11.13kV/cm. [Copyright &y& Elsevier]

Published
2013
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