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CaZn1/3Nb2/3O3-based dielectric ceramics for silver co-sintering applications

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Author(s): Chaouchi A. | Saidi M. | d’Astorg S. | Marinel S.

Journal: Science of Sintering
ISSN 0350-820X

Volume: 44;
Issue: 3;
Start page: 299;
Date: 2012;
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Keywords: Ca(Zn1/3Nb2/3)O3 | perovskite | dielectric properties | capacitors

ABSTRACT
The Ca(Zn1/3Nb2/3)O3 (CZN) complex perovskite oxide has been studied for its attractive dielectric properties (εr=34, Qxf=15 890GHz, τf=-48 ppm.°C-1) for applications such as multilayer ceramics capacitors or hyperfrequency resonators. Nevertheless, high temperatures (>1250°C) are required to obtain well dense CZN ceramic, prohibiting any silver co-sintering (Tf (Ag) = 961°C). For that reason, the sintering temperature lowering of CZN by glass phase’s additions has been investigated. This material is finally sinterable at low temperature with combined glass phase -lithium salt additions, and exhibits, at 1MHz, very low dielectric losses, a relatively high dielectric constant with a good stability versus temperature. The 2%weight of ZnO-SiO2-B2O3 glass phase and 1%wt of LiF added CZN sample sintered at 920°C exhibits a relative density higher than 95% and attractive dielectric properties: a dielectric constant εr of 22, low dielectrics losses (tan (δ)< 10-3), a temperature coefficient of the permittivity τε
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