High-temperature electronic transport properties of (YCa) BaCo4O7 compounds

被引：6

作者：

Hao, Haoshan ^{[1
]}

He, Qinglin ^{[2
]}

Cheng, Yongguang ^{[1
]}

Zhao, Limin ^{[1
]}

机构：

[1] Sch Sci, Henan Inst Engn, Zhengzhou 451191, Peoples R China

[2] Jiaozuo Teachers Coll, Sch Sci, Jiaozuo 454001, Peoples R China

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2014年 / 75卷 / 04期

关键词：

A; Oxides; D; Diffusion; D. Electrical properties; OXYGEN-ADSORPTION PROPERTIES; MAGNETIC-PROPERTIES; YBACO4O7+DELTA; STABILITY; COBALTITE; SUBSTITUTION; FERRIMAGNET; TRANSITION; CAPABILITY; CATHODE;

D O I：

10.1016/j.jpcs.2013.11.009

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Y1-xCaxBaCo4O7 (0.0 <= x <= 1.0) samples were prepared by the solid-state reaction method and their high-temperature electronic transport properties were investigated in nitrogen and oxygen respectively. Phase structure of Y1-xCaxBaCo4O7 transforms from hexagonal symmetry for x <= 0.6 samples to orthorhombic symmetry for x >= 0.8 samples. In nitrogen, Y1-xCaxBaCo4O7 samples evolve three kinds of electronic transport behaviors with the increase of Ca content: thermal activation conduction, small polaron hopping conduction, and a possible mixed conduction. Ca doping increases the hole concentration and thus decreases Seebeck coefficients. In oxygen, the temperature dependence of electrical resistivity and Seebeck coefficients of Y1-xCaxBaCo4O7 samples displays similar change to their respective thermogravimetric curve, showing their electronic transport behavior under the control of their oxygen adsoption/desorption process. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：495 / 499

页数：5

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