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Published in: Journal of Materials Science: Materials in Electronics 23/2017

28-08-2017

Effects of La3+ doping on the crystal structures, densities, microstructures and thermosensitive characteristics of the LaxBa1−xCoO3−δ (0 ≤ x ≤ 0.1) ceramics for low temperature NTC resistances

Authors: Zhenhua Hu, Junhua Wang, Xianxian Xie, Xu Liu, Jincheng Yao, Aimin Chang

Published in: Journal of Materials Science: Materials in Electronics | Issue 23/2017

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Abstract

In this work, polycrystalline LaxBa1−xCoO3−δ (0 ≤ x ≤ 0.1) ceramic samples were prepared by conventional solid-state reaction process. La3+ doping effects on the crystal structures, densities, microstructures and thermosensitive characteristics of the LaxBa1−xCoO3−δ ceramics were investigated. The major phase presented in the sintered samples is a hexagonal perovskite BaCoO2.6 phase. The doping of La3+ reduces the quantity of voids and improves the densities of the LaxBa1−xCoO3−δ ceramics compared with La-free ceramic. The resistivities of the LaxBa1−xCoO3−δ ceramics decrease exponentially with increasing temperature in each of the range of 10–26 K and 26–100 K. The resistivities and B constants increase as the contents of La3+ increase in the LaxBa1−xCoO3−δ ceramics.

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Metadata
Title
Effects of La3+ doping on the crystal structures, densities, microstructures and thermosensitive characteristics of the LaxBa1−xCoO3−δ (0 ≤ x ≤ 0.1) ceramics for low temperature NTC resistances
Authors
Zhenhua Hu
Junhua Wang
Xianxian Xie
Xu Liu
Jincheng Yao
Aimin Chang
Publication date
28-08-2017
Publisher
Springer US
Published in
Journal of Materials Science: Materials in Electronics / Issue 23/2017
Print ISSN: 0957-4522
Electronic ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-017-7698-4

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