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Effect of Al2O3 Content on Dielectric Properties of Al2O3/LiTaO3 Composite Ceramics

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Author(s): ZHANG You-Feng,ZHOU Yu,JIA De-Chang,MENG Qing-Chang

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 24;
Issue: 6;
Start page: 1189;
Date: 2009;
Original page

Keywords: LiTaO3 | Al2O3 | dielectric property | composite ceramics

ABSTRACT
The effect of Al2O3 addition (5vol%, 10vol%, 15vol% and 20 vol%) on the dielectric properties of Al2O3/LiTaO3(ALT) composite ceramics prepared by hot-press sintering were investigated. The results show that the dielectric constant and dielectric loss of ALT composite ceramics decrease with the increasing frequency. Comparing with pure LiTaO3 ceramics, adding 5vol% Al2O3 can increase its dielectric constant and decrease its dielectric loss, while the dielectric constant and dielectric loss of ALT composite ceramics increase consequently with more Al2O3 adding. With Al2O3 contents increasing, the Curie temperature initiately increases and then decreases, reaching the maximum at 5vol% Al2O3. Thus, Al2O3/LiTaO3(ALT) composite ceramics is a good composite system because the addition of the second phase Al2O3 promotes sintering of LiTaO3, and slightly improves its dielectric properties.

Tango Jona
Tangokurs Rapperswil-Jona

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