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Y2O3-doped Zn1-xNixO (x = 0, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.9) powders were prepared by a wet chemical synthesis method, and the related ceramics were obtained by the traditional ceramic sintering technology. The phases and related electrical properties of the ceramics were investigated. The analysis of X-ray diffraction (XRD) indicates that the prepared ceramics with Ni substitution have a cubic crystalline structure. The resistance–temperature feature indicates that all the ceramics show a typical effect of negative temperature coefficient (NTC) of resistivity with the thermal constants between 3998 and 5464 K, and have high cyclical stability in a temperature range from 25 to 300 ℃. The impedance analysis reveals that both grain effect and grain boundary effect contribute collectively to the NTC effect. The electron hopping and band conduction models are proposed for the grain (bulk) conduction, and the thermally activated charge carrier transport overcoming the energy barrier is suggested for the grain boundary conduction.


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Characterization of new negative temperature coefficient thermistors based on Zn–Ni–O system

Show Author's information Xiang SUNaHong ZHANGa,bYa LIUaJia GUOaZhicheng LIa,b( )
School of Materials Science and Engineering, Central South University, Changsha 410083, China
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract

Y2O3-doped Zn1-xNixO (x = 0, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.9) powders were prepared by a wet chemical synthesis method, and the related ceramics were obtained by the traditional ceramic sintering technology. The phases and related electrical properties of the ceramics were investigated. The analysis of X-ray diffraction (XRD) indicates that the prepared ceramics with Ni substitution have a cubic crystalline structure. The resistance–temperature feature indicates that all the ceramics show a typical effect of negative temperature coefficient (NTC) of resistivity with the thermal constants between 3998 and 5464 K, and have high cyclical stability in a temperature range from 25 to 300 ℃. The impedance analysis reveals that both grain effect and grain boundary effect contribute collectively to the NTC effect. The electron hopping and band conduction models are proposed for the grain (bulk) conduction, and the thermally activated charge carrier transport overcoming the energy barrier is suggested for the grain boundary conduction.

Keywords:

Zn1-xNixO, thermistors, microstructure, electrical properties, conduction mechanism
Received: 07 July 2016 Revised: 02 August 2016 Accepted: 25 August 2016 Published: 23 December 2016 Issue date: December 2016
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Publication history

Received: 07 July 2016
Revised: 02 August 2016
Accepted: 25 August 2016
Published: 23 December 2016
Issue date: December 2016

Copyright

© The author(s) 2016

Acknowledgements

The authors acknowledge the financial support provided by the National Natural Science Foundation of China (No. 51172287) and the Laboratory Research Fund by the State Key Laboratory of Powder Metallurgy, Central South University, China.

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