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Microwave Dielectric Properties of Ba <sub>2</sub> Ca <sub> 1− <i>x</i> </sub> Sr <sub> <i>x</i> </sub> WO <sub>6</sub> Double Perovskites

Yuanyuan ZhouState Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaSiqin MengState Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaHongchao WuSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100084, ChinaZhenxing YueState Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2011en
ABI

Annotatsiya

Ba 2 Ca 1− x Sr x WO 6 ( x =0–1) microwave dielectric ceramics have been prepared using the two‐step solid‐state reaction method. The substitution of Sr 2+ for Sr 2+ can effectively lower the densification temperature of the ceramics from 1500° to 1200°C. Single‐phase ceramics with double perovskite structures were obtained, and structural transitions occurred in Ba 2 Ca 1− x Sr x WO 6 via the phase sequence: cubic→rhombohedral→monoclinic with an increase of x . The microwave dielectric properties of the Ba 2 Ca 1− x Sr x WO 6 ceramics can be effectively tuned by tailoring x . The dielectric constant (ɛ r ) remains almost unvaried, the quality factor ( Q × f ) decreases monotonically, and the temperature coefficient of resonant frequency (τ f ) changes in sign with the increase of x . A good combination of the microwave dielectric properties was obtained for Ba 2 Ca 0.975 Sr 0.025 WO 6 sintered at 1250°C: ɛ r =23.9, Q × f =80 200 GHz, and τ f =+18 ppm/°C.

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DOI
10.1111/j.1551-2916.2011.04450.x

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