Jia Zhu
Tsinghua University
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Publication
Featured researches published by Jia Zhu.
Journal of Materials Science: Materials in Electronics | 2014
Jia Zhu; Yong Zhang; Qian Zhang; Xiaozhen Song; I. S. Baturin
A system of barium strontium titanate glass ceramics with different fluoride concentrations were prepared by melt-annealing technique. The effect of fluoride doping on impedance spectra of the barium strontium titanate glass ceramics were investigated. According to the impedance spectroscopy studies, three (low, middle, and high frequency) electrical responses, which corresponds to glass phase, crystal–glass interface and crystal interior were identified. It is shown that with the increase of fluoride concentration, the resistivity of the glass phase passed through a minimum and then increased. In addition, the capacitance of the crystal–glass interface increased and the capacitance of the crystal phase decreased with the increase of the fluoride concentration. Moreover, as a result of ac conductivity calculation and analysis, it is believed that the dc conduction was affected by the glass and crystal–glass interface regions and ac regime was attributed to the crystal phase. Based on the results, a change of the compensation mechanism from electronic to ionic one with variation in fluoride concentration was proposed.
Journal of Materials Science: Materials in Electronics | 2016
Wenle Ma; Xiaozhen Song; Yong Zhang; Qian Zhang; Jia Zhu; Dongliang Yang; Y. B. Chen; I. S. Baturin
The effect of lanthanum concentration on dielectric relaxation behavior in lead zirconate stannate titanate antiferroelectric ceramics was investigated by X-ray diffraction technique, dielectric spectroscopy, Sawyer–Tower polarization methods, and thermally stimulated depolarization current (TSDC) measurements. The tetragonal phase was found to be stabilized from the rhombohedral phase by lanthanum substitution. As the lanthanum content was increased, the dielectric constant decreased gradually over the measuring temperature range. As a result of polarization–electric field hysteresis loops, the maximum polarization decreased and the switching field increased with the increase of lanthanum content. Investigations of TSDC measurements revealed that the peak is due to space-charge polarization. It is suggested to be associated with the relaxation of oxygen vacancies.
Key Engineering Materials | 2014
Jia Zhu; Yong Zhang; Wei Tian; Xiao Zhen Song; Qian Zhang
Barium strontium titanate glass-ceramics with different La2O3 concentrations have been prepared by a melting-annealing technique. The effect of La2O3 concentration on phase evolution, microstructure and electrical properties of (Ba,Sr)TiO3-Al2O3-SiO2 glass-ceramics has been investigated. The X-ray diffraction results showed the volume fraction of the major perovskite (Ba,Sr)TiO3 crystalline phase increased with increasing La2O3 concentration. In addition, the scanning electron microscopy observations revealed that small amounts of La2O3 could accelerate the growth of crystals. When the La2O3 concentration was increased to 1.5 mol%, the microstructure of these samples displayed nonuniform distribution of the crystals. The dc conductivity measurements showed an increasing temperature dependence of conductivity with La2O3 doping at high temperature range above 400 °C. Impedance spectroscopy analysis indicated that the additive of La2O3 changed the major polarization mechanism to the relaxation polarization and the relaxation time for the La2O3 doped samples was much shorter than the undoped ones. The frequency dependence of dissipation factor curve displayed a peak at the range of 1 to 10 kHz due to the La2O3 addition. And the peak value decreased with increasing La2O3 concentration.
Ceramics International | 2015
Qian Zhang; Xiaolin Liu; Yong Zhang; Xiaozhen Song; Jia Zhu; I. S. Baturin; Jian-Feng Chen
Journal of the American Ceramic Society | 2015
Jia Zhu; Yong Zhang; Xiaozhen Song; Qian Zhang; Dongliang Yang; Y. B. Chen
Ceramics International | 2014
Xiangrong Wang; Yong Zhang; Jia Zhu; Xiaozhen Song; Ruifang Lv; Jianan Liu; Meimei Zhang
Physica Status Solidi (a) | 2015
Jia Zhu; Yong Zhang; Xiaozhen Song; Qian Zhang; Dongliang Yang; Y. B. Chen
Journal of Electronic Materials | 2015
Xiaozhen Song; Yong Zhang; Y. B. Chen; Qian Zhang; Jia Zhu; Dongliang Yang
Journal of Electronic Materials | 2016
Qian Zhang; Yong Zhang; Xiaolin Liu; Xiaozhen Song; Jia Zhu; I. S. Baturin
Journal of Sol-Gel Science and Technology | 2014
Qingyu Pang; Yong Zhang; Jia Zhu; Xiaozhen Song; Xiangrong Wang; Qian Zhang