Crystallographic modeling and impedance studies of gadolinium modified La1-x,GdxMnO3 (x=0.1-0.3) ceramics

被引：1

作者：

Chourasia, Rashmi ^{[1
]}

Varma, Vijay ^{[1
]}

Chaurasiya, Shivendra ^{[2
]}

Shrivastava, O. P. ^{[1
]}

机构：

[1] Dr HS Gour Cent Univ, Dept Chem, Sagar 470003, MP, India

[2] Dr HS Gour Cent Univ, Dept Microbiol, Sagar 470003, MP, India

来源：

POLYHEDRON | 2017年 / 121卷

关键词：

X-ray diffraction; Nanoceramics; Rietveld refinement; Electrical properties; Electron microscopy; OXIDE FUEL-CELLS; OXYGEN PERMEATION; COMBUSTION;

D O I：

10.1016/j.poly.2016.10.002

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The crystal chemistry of perovskite structured ceramic phases: La0.9Gd0.1MnO3 (LMGd-1); La0.8Gd0.2MnO3 (LMGd-2) and La0.7Gd0.3MnO3 (LMGd-3) have been investigated using General Structure Analysis System (GSAS) programming. The LMGd phases crystallize in the space group R-3c and Z = 6. Powder diffraction data have been subjected to Rietveld refinement to arrive at a satisfactory structural convergence of Rietveld parameters: R-p, R-wp and goodness of fit. Lattice parameters, bond lengths and bond angles have been calculated from GSAS software. Their electrical behaviour investigated by impedance spectroscopy in the frequency range 42 Hz-5 MHz at temperatures between 50 and 300 degrees C. Nyquist plots show the dominance of grain contribution and Debye-like relaxation in the materials. Conductivity data as a function of temperature and frequency suggest semiconductor behavior of the materials. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：269 / 277

页数：9

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