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Effects of Mg substitution on microstructure and electrical properties of NiMn2−xMgxO4 NTC ceramics

Published online by Cambridge University Press:  10 February 2012

Jiangying Wang  and
Jingji Zhang
Jiangying Wang*
Affiliation:
Department of Materials Science and Engineering, China Jiliang University, 310018 Hangzhou, People’s Republic of China
Jingji Zhang
Affiliation:
Department of Materials Science and Engineering, China Jiliang University, 310018 Hangzhou, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: wjyliu@163.com
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Abstract

NiMn2−xMgxO4 (0 ≤ x ≤ 0.4) ceramics have been studied by powder x-ray diffraction (XRD), infrared (IR) spectroscopy, and thermogravimetric analysis. NiMn2−xMgxO4 ceramics are all single-phase with spinel structure. XRD and IR spectroscopy results indicate that Mg2+ ions occupy A- and B-site of spinel lattice, which inhibits the formation of cation vacancies. Moreover, Mg2+ substitution enhances the tolerance of the oxidation in air. As a result, Mg substitution leads to a significant increase in ρ25, temperature coefficient of resistivity B25/85, and activation energy, which improves the aging property of NiMn2−xMgxO4 negative temperature coefficient thermistors.

Keywords

Electrical propertiesInfrared spectroscopyThermogravimetric analysis

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Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 6 , 28 March 2012 , pp. 928 - 931
Copyright
Copyright © Materials Research Society 2012

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