NDLI: Preparation and characterization of negative temperature coefficient (Ni,Mn)$_{3}$O$_{4}$–La(Mn,Ni)O$

Content Provider	Springer Nature Link
Author	Zhao, Chunhua Wang, Zhongbing Wang, Shouming Yang, Pinghua Chen, Chusheng
Copyright Year	2007
Abstract	The composites made of spinel-structured (Ni,Mn)$_{3}$O$_{4}$ and perovskite-structured La(Mn,Ni)O$_{3}$ were investigated for potential application as negative temperature coefficient (NTC) thermistor. The composites were prepared using the standard ceramic route. The electrical resistivity of the composite at 25°C was found to decrease by one to two orders of magnitude depending the amount of the low-resistivity perovskite phase, while the thermal constant determining the temperature sensitivity of the NTC thermistor was still reasonably large in the range of 4,000 to 3,000 K, and the resistivity drift after annealing at 150°C for 1,000 h in air was relatively small (∼1.2%). The general effective media model was adopted to fit the electrical resistivity data of the composites, giving a value of 0.37 for the percolation volume fraction of the perovskite phase. This work demonstrates that it is possible to tune the electrical resistivity and thermal constant of the spinel-structured oxide through making composite with low-resistivity perovskite-structured oxide.
Starting Page	113
Ending Page	117
Page Count	5
File Format	PDF
ISSN	13853449
Journal	Journal of Electroceramics
Volume Number	20
Issue Number	2
e-ISSN	15738663
Language	English
Publisher	Springer US
Publisher Date	2007-12-11
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	NTC thermistors Composite Electrical properties Percolation Crystallography Electrochemistry Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Optical and Electronic Materials
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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