铈镧复合氧化物对ZnVCrO陶瓷显微结构及压敏性能的影响

doi:10.11896/j.issn.1005-023X.2017.06.024

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Abstract ZnVCrO based ceramics with 0%-0.6% Ce-La oxide composite were synthesized by traditional mixing oxide procedure, sintering at 850 ℃ for 4 hours. XRD, SEM, EDS and V-I test were used to investigate the dopant effect on the microstructure and varistor properties of the obtained ceramics. The results showed Zn₃(VO₄)₂, ZnCr₂O₄ were the secondary crystalline phases within the ceramics in addition to ZnO primary phase. Ce(La)VO₄ solid solution was an additional secondary crystalline phase in the ceramics with Ce-La oxide composite and the amount of additional secondary phase increased with the further addition of the dopant. Composite dopant of more than 0.4wt% could greatly improve the microstructural homogeneity of ZnVCrO based ceramics, and the variation of its content showed no major influence on sintering. The ceramic with 0.4wt% Ce-La composite has the optimum varistor properties: nonlinear coefficient was 24.7, breakdown field was 1 029 V/mm, leak current density was 92 μA/cm².

Key words： Ce-La oxide composite ZnVCrO varistor ceramic microstructure

Published: 02 May 2018

CLC number:	TN304.93
	TN379

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	ZHAO Ming
	LI Tianyu
	SHI Yu

Cite this article:

ZHAO Ming,LI Tianyu,SHI Yu. Effect of Ce-La Oxide Composite on the Microstructure and Varistor
Properties of ZnVCrO Based Ceramics[J]. Materials Reports, 2017, 31(6): 120-124.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.06.024 OR http://www.mater-rep.com/EN/Y2017/V31/I6/120

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