Effect of excess Bi2O3 on the ferroelectric properties of SrBi2Ta2O9 ceramics
Effect of excess Bi2O3 on the ferroelectric properties of SrBi2Ta2O9 ceramics
复制标题
过量Bi2O3对SrBi2Ta2O9陶瓷铁电性能的影响
DOI：
10.1063/1.1286062
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发表时间：
2000
影响因子：
3.2
通讯作者：
K. Hong
中科院分区：
文献类型：
--
作者：
Jung‐Kun Lee;Byungwoo Park;K. Hong
在本研究中，借助er(T)、铁电磁滞回线、X射线衍射(XRD)和拉曼光谱，探讨了铋含量对锶铋钽(SBT)陶瓷的相变行为、铁电性能和晶体结构的影响。相变行为和铁电性质（例如自发极化（Ps））都显示出对 Bi 含量的依赖性。发现铁电居里温度 Tc 随着 Bi 含量的增加而降低，并且当添加 2-3 mol % 过量 Bi2O3 时，Ps 达到最大。研究发现拉曼光谱和 XRD 可以解释 SBT 陶瓷的 Bi 含量依赖性。拉曼光谱中低于 60 cm−1 的模式频率和宽度表明发生了 Sr2+ 和 Bi3+ 离子的位点交换。通过 XRD 图案中 I(008)/I(105) 强度比的变化证实了反位缺陷的形成。结构因子的计算表明它也与反位缺陷（SrBi、B...
In this study, the effect of bismuth content on phase-transition behavior, ferroelectric property, and crystal structure of strontium–bismuth–tantalate (SBT) ceramics was explored with the aid of er(T), ferroelectric hysteresis loop, x-ray diffraction (XRD), and Raman spectroscopy. Both the phase-transition behavior and ferroelectric properties such as spontaneous polarization (Ps) showed a dependence on Bi content. The ferroelectric Curie temperature Tc, was found to decrease with increasing the Bi content and Ps was maximized when 2–3 mol % excess Bi2O3 was added. It was found that Raman spectroscopy and XRD can explain the Bi-content dependence of SBT ceramics. The frequency and the width of the mode below 60 cm−1 in Raman spectra revealed that a site exchange of Sr2+ and Bi3+ ions occurred. The formation of antisite defects was confirmed by the change in the intensity ratio of I(008)/I(105) in the XRD patterns. The calculation of structure factors showed it was also related to antisite defects (SrBi,B...