Effect of bismuth deficiency on structure and electrical properties of (Na0.5Bi0.5)0.93Ba0.07TiO3 ceramics
Effect of bismuth deficiency on structure and electrical properties of (Na0.5Bi0.5)0.93Ba0.07TiO3 ceramics
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DOI：
10.1016/j.jpcs.2008.02.009
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发表时间：
2008-08
影响因子：
4
通讯作者：
Qing Xu;Yu-Heng Huang;Min Chen;Wen Chen;Bok-Hee Kim;B. Ahn
中科院分区：
文献类型：
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作者：
Qing Xu;Yu-Heng Huang;Min Chen;Wen Chen;Bok-Hee Kim;B. Ahn
采用柠檬酸盐法制备了（Na0.5Bix）0.93Ba0.07TiO3（x=0.500-0.492）陶瓷，研究了Bi含量对陶瓷结构和电学性能的影响。发现Bi的缺乏对晶体结构和显微组织有相当大的影响。对介电常数ε 33 T/ε 0和介电损耗tanδ的温度依赖性以及极化-电场（P-E）磁滞回线随温度的变化进行了研究，结果表明Bi的缺乏提高了去极化温度（Td）。Bi的缺乏导致矫顽场（Ec）和机械品质因数（Qm）的增加，以及反射极化（Pr）和压电常数（d33）的降低。根据Bi缺陷样品中Bi和氧空位的形成，定性地解释了结构和电学性能随Bi缺陷量的变化。本研究表明，适当控制Bi的化学计量的（Na 0.5Bi 0.5）0.93 Ba 0.07 TiO 3陶瓷在获得所需的铁电和压电性能的重要性。
(Na0.5Bix)0.93Ba0.07TiO3(x=0.500–0.492) ceramics were prepared by a citrate method, and the structure and electrical properties of the ceramics were investigated with respect to the amount of Bi deficiency. It was detected that the Bi deficiency had a considerable impact on the crystal structure and microstructure. The inspection of both the temperature dependence of the dielectric properties (free permittivity ε33T/ε0and dielectric loss tanδ) and the evolution of the polarization–electrical field (P–E) hysteresis loops with measuring temperature suggests that the Bi deficiency served to increase the depolarization temperature (Td). The Bi deficiency led to an increase in the coercive field (Ec) and mechanical quality factor (Qm) together with a decrease in the remanent polarization (Pr) and piezoelectric constants (d33). The variation of the structure and electrical properties with Bi deficiency amount was qualitatively interpreted in terms of the formation of Bi and oxygen vacancies in the Bi-deficient specimens. This research indicates the importance of adequately controlling Bi stoichiometry of (Na0.5Bi0.5)0.93Ba0.07TiO3ceramics in obtaining the desired ferroelectric and piezoelectric properties.