Study of the properties of SBT ceramics doped with different concentrations of Ca
Study of the properties of SBT ceramics doped with different concentrations of Ca
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DOI：
10.1016/j.ceramint.2018.08.303
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发表时间：
2018-12
影响因子：
5.2
通讯作者：
Fengqing Zhang;Xuefeng Zhao;Huiying Liu;Wang Lingxu-;Peng Shen;Qingbo Tian;Huajun Sun;S. Fan
中科院分区：
文献类型：
--
作者：
Fengqing Zhang;Xuefeng Zhao;Huiying Liu;Wang Lingxu-;Peng Shen;Qingbo Tian;Huajun Sun;S. Fan
研究了Ca掺杂对Sr 2Bi 4 Ti 5 O 18（SBT）陶瓷电性能的影响。在所测试的样品中，取代度为0.15的样品显示出最高的轴取向和最大的晶格畸变。通过XPS分析，发现Ca的替代抑制了SBT中氧空位的形成。Ca0.15Sr1.85Bi4Ti5O18（CSBT-0.15）陶瓷具有17.7 μC/cm 2的大剩余极化率和91 kV/cm的小矫顽场，表明该样品具有最好的铁电性能。随着掺杂量的增加，漏电流密度的变化先减小后增大，掺杂量为0.15的样品在~80 kV/cm时的漏电流密度最小，为J = 1.1 × 10−6A/cm 2。对于所研究的CaxSr 2-xBi 4 Ti 5 O 18（CSBT）陶瓷样品，空间电荷限制导电（SCLC）被确定为主要的导电机制。
This study investigated how Ca doping affects the electrical properties of Sr2Bi4Ti5O18(SBT) ceramics. Among the samples tested, a sample with a substitution level of 0.15 showed the highesta-axis orientation and the largest lattice distortion. Through XPS analysis, it was found that the formation of oxygen vacancies is suppressed by Ca substitution in SBT. A large remnant polarization (2Pr) of 17.7 μC/cm2and small coercive field (2Ec) of 91 kV/cm was observed for the Ca0.15Sr1.85Bi4Ti5O18(CSBT-0.15) ceramic, which indicated that this sample possessed the best ferroelectric properties. As the substitution level increased, the variation of the leakage current density first decreased and then increased, and the sample with the substitution level of 0.15 showed the smallest leakage current density ofJ= 1.1 × 10−6A/cm2at ~80 kV/cm. For the investigated CaxSr2-xBi4Ti5O18(CSBT) ceramic samples, space-charge-limited conduction (SCLC) was determined to be the main conduction mechanism.