Modification of Relaxor and Impedance Spectroscopy Properties of Lead Magnesium Niobate by Bismuth Ferrite

详细信息    查看全文

• 作者：S. N. Das ; S. Pradhan ; S. Bhuyan ; R. N. P. Choudhary…
• 关键词：PMN ; BFO multiferroic ; relaxor ; impedance characteristics ; dielectric behavior
• 刊名：Journal of Electronic Materials
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：46
• 期：3
• 页码：1637-1649
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics;
• 出版者：Springer US
• ISSN：1543-186X
• 卷排序：46

文摘

The relaxor and impedance characteristics of classic or traditional lead magnesium niobate (PbMg_1/3Nb_2/3O₃; PMN) ferroelectric relaxor material have been modified by chemically synthesizing with multiferroic bismuth ferrite (BiFeO₃; BFO). Detailed studies of structural, morphological and electrical properties of PMN-BFO-prepared solid solutions [((Pb_1−xBi_x) (Mg_0.33(1−x)Nb_0.66(1−x)Fe_x) O₃) with x = 0.1, 0.2, 0.3 and 0.4] reveal some interesting findings on structure–properties relationships. The formation of single phase material of each compound in orthorhombic crystal system is identified from x-ray diffraction. The microstructure analyses reveal that the grain size of PMN-BFO increases for increasing BFO weight percent with PMN. The increase of BFO concentration not only improves the dielectric response of PMN-BFO but also modifies the nature of attained phase transition from a typical relaxor to a normal ferroelectric. The impedance spectroscopy studies exhibit the presence of grain and grain boundary effects, and the existence of a positive temperature coefficient of resistance (PTCR) in the material. The ac conductivity increases with the increase in frequency in the low-temperature region for larger content of BFO in the solid solutions. It is observed that the prepared electronic materials obey the non-Debye-type of conductivity relaxation behavior.