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Structural, morphological, Raman and ac electrical properties of the multiferroic sol-gel made Bi0.8Er0.1Ba0.1Fe0.96Cr0.02Co0.02O3 material
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2019-02-01 , DOI: 10.1016/j.jallcom.2018.10.142
A. Benali , B.M.G. Melo , P.R. Prezas , M. Bejar , E. Dhahri , M.A. Valente , M.P.F. Graça , B.A. Nogueira , B.F.O. Costa

Abstract We have investigated the effect of multi-doping in A and B site of the multiferroic prepared by the Sol-gel method Bi0.8Er0.1Ba0.1Fe0.96Co0.02Cr0.02O3 (BEBFCC) on the structural, morphological and electric properties. X-Ray diffraction and Rietveld refinement confirm that the BEBFCC compound presents a rhombohedral structure with the R3C space group. The Ac electrical properties have been measured from 331 to 735 K as a function of frequency (100 kHz - 1 MHz). Debye's theory and Arrhenius relations were used to study the relaxation phenomenon. The frequency dependence of the impedance (Z”: imaginary part) reveals the existence of one relaxation peak, while the Modulus formalism shows two peaks. The presence of two contributions, related to the dielectric relaxations visible in this compound, was confirmed by the Impedance Nyquist plots. The study of the ac conductivity based on Jonsher's power law confirms that the conduction is associated to the Non-Overlapping Small Polaron Tunneling model.

中文翻译:

多铁性溶胶-凝胶制成的 Bi0.8Er0.1Ba0.1Fe0.96Cr0.02Co0.02O3 材料的结构、形态、拉曼和交流电性能

摘要 我们研究了溶胶-凝胶法制备的多铁性材料Bi0.8Er0.1Ba0.1Fe0.96Co0.02Cr0.02O3 (BEBFCC) 的A 位和B 位多掺杂对结构、形态和电学性能的影响。X 射线衍射和 Rietveld 精修证实 BEBFCC 化合物呈现 R3C 空间群的菱形结构。作为频率 (100 kHz - 1 MHz) 的函数,已在 331 至 735 K 范围内测量了交流电特性。德拜理论和阿伦尼乌斯关系被用来研究松弛现象。阻抗的频率依赖性(Z”:虚部)显示存在一个弛豫峰,而模量形式显示两个峰。存在两种与该化合物中可见的介电弛豫有关的贡献,阻抗奈奎斯特图证实了这一点。基于 Jonsher 幂律的交流电导率研究证实,传导与非重叠小极化子隧道模型相关。
更新日期:2019-02-01
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