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Published in:
04-05-2016
Low temperature sintering and microwave dielectric properties of 0.7(Sr0.01Ca0.99)TiO3–0.3(Sm0.75Nd0.25)AlO3 ceramics with LiF additive
Published in: Journal of Materials Science: Materials in Electronics | Issue 9/2016
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Abstract
The effect of LiF on phase composition, microstructures, sintering behavior, and microwave dielectric properties of 0.7(Sr0.01Ca0.99)TiO3–0.3(Sm0.75Nd0.25)AlO3 (7SCT–3SNA) ceramics prepared by conventional solid-state route were investigated. LiF as additives showed no obvious influence on the phase of the 7SCT–3SNA ceramics and all the samples exhibited pure perovskite structure. The presence of LiF effectively reduced the sintering temperature of 7SCT–3SNA ceramics due to the formation of a liquid phase at a relatively low temperature during sintering progress. The 7SCT–3SNA sample with 5 wt% of LiF, sintered at 1250 °C for 4 h, was measured to show excellent microwave dielectric properties, with an ε
r
of 38.6, a Q × f value of 38,230 and τ
f
value of +5.1 ppm/°C, which showed dense and uniform microstructure as well as well-developed grain growth.