Microstructure and microwave dielectric properties of xSm(Mg0.5Ti0.5)O3–(1 − x)Ca0.8Sr0.2TiO3 ceramics
xSm(Mg0.5Ti0.5)O3–(1 − x)Ca0.8Sr0.2TiO3 (x = 0.50–0.95) ceramics are prepared by a conventional solid-state ceramic route. The microstructure and microwave dielectric properties are investigated as a function of the x-value and sintering temperature. The single phase solid solutions were obtained throughout the studied compositional range. The variation of bulk density and dielectric properties are related with the x-value. Increasing sintering temperature can effectively promote the densification and dielectric properties of xSm(Mg0.5Ti0.5)O3–(1 − x)Ca0.8Sr0.2TiO3 ceramic system. With the content of Sm(Mg0.5Ti0.5)O3 increasing, the temperature coefficient of resonant frequency τ f value decreased, and a near-zero τ f could be obtained for the samples with x = 0.80. The optimal microwave dielectric properties with a dielectric constant ε r of 30.1, Q × f of 115,000 GHz (at 8.0 GHz), and τ f of 8.9 ppm/°C were obtained for 0.80Sm(Mg0.5Ti0.5)O3–0.20Ca0.8Sr0.2TiO3 sintered at 1,550 °C for 3 h, which showed high density and well-developed grain growth.
KeywordsBulk Density Resonant Frequency Sinter Temperature Microwave Dielectric Property Increase Sinter Temperature
This work was supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT), IRT1146.
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