Electrical transport properties of La0.845Sr0.155MnO3:Kx (0 ≤ x ≤ 0.2) composites

被引：37

作者：

Li, Hongjiang ^{[1
]}

Chu, Kaili ^{[1
]}

Pu, Xingrui ^{[1
]}

Sun, Tao ^{[1
]}

Dong, Gang ^{[1
]}

Liu, Yang ^{[1
]}

Zhang, Shuai ^{[1
]}

Liu, Xiang ^{[1
]}

机构：

[1] Kunming Univ Sci & Technol, Sch Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 810卷

基金：

中国国家自然科学基金;

关键词：

La0.845Sr0.155MnO3:K-x (LSMO:K-x) composites; Temperature coefficient of resistivity (TCR); Variable-range hopping (VRH); Phenomenological percolation model; ROOM-TEMPERATURE TCR; COLOSSAL MAGNETORESISTANCE; MAGNETIC-PROPERTIES; MAGNETOTRANSPORT PROPERTIES; POLYCRYSTALLINE; CERAMICS; SR; MR; LA0.7CA0.3MNO3; TRANSITION;

D O I：

10.1016/j.jallcom.2019.151908

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

La0.845Sr0.155MnO3:K-x composites were synthesized and characterized by X-ray-based techniques. The results show that K+ ions substitute La3+ and Sr2+. A systematic investigation of the electrical transport properties was correlated to the Jahn-Teller, the double exchange effects, the Kondo-like spin-dependent scattering, and the intergranular spin-polarized tunneling. The electrical conduction mechanisms on the metallic region have been investigated. Moreover, the electrical resistivity of the insulating region was explained via the variable-range hopping model. At the optimized doping molar content of 0.15, the peak temperature coefficient of the resistivity measures 8.30% K-1 at 288.01 K. This is the best value reported for K-doped perovskite manganites until now. These findings suggest that LSMO:K-0.15 composites can be used to prepare uncooled infrared bolometers. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：12

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