Re-entrant relaxor behavior in BaTiO₃-Bi(Zn_2/3Nb_1/3)O₃ ceramics

详细信息    查看全文

• 作者：Longwen Wu ; Xiaohui Wang ; Zhengbo Shen ; Bingcheng Luo and Longtu Li
• 刊名：Journal of the American Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：100
• 期：2
• 页码：511-514
• 全文大小：675K
• ISSN：1551-2916

文摘

The (1−x)BaTiO₃−xBi(Zn_2/3Nb_1/3)O₃ (x=0.10-0.25) ceramics were fabricated via solid-state reactions. Temperature-dependent polarization measurement reveals that with the temperature lowering, the remnant polarization increases till a maximum value before it decreases, showing a reentrant phenomenon. Absence of apparent switching current peaks in the current density as a function of electric field should indicate the lack of a ferroelectric transition, which is further verified by the consistent macroscopic phase structure from the Raman spectra. An anomalous peak in the full width at half maximum of a deconvoluted mode at ~515 cm⁻¹ suggests the entering of a more disordered state of dipolar dynamics, which may be originated from the competition between the freezing of polar nanoregions and the random interacting fields.