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Structures and Microwave Dielectric Properties of Ba[Ti1−x(Co0.5W0.5)x]O3 (x = 0.40–0.90) Perovskite Ceramics

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Perovskite ceramics of Ba[Ti1−x (Co0.5W0.5)x]O3 (x = 0.40–0.90) were synthesized by a conventional solid‐state reaction method. Crystal phase, microstructure, and microwave dielectric property of the ceramics were investigated. A phase transition from simple cubic (x = 0.40–0.55) to hexagonal and then to cubic double pervoskite (x = 0.75–0.90) was detected. A single hexagonal perovskite structure (P6 3 /mmc) was obtained at 1425°C and stabilized at room temperature only at x = 0.61. For ceramics x = 0.55–0.60 and x = 0.62–0.75, they are mixtures that consisted of cubic and hexagonal perovskites. With increasing x, Qxf increased from 2800 to 20 700 GHz, whereas dielectric constant (εr) decreased from 65 to 18, and temperature coefficient of resonant frequency (τƒ) decreased from 44 to −17 ppm/°C. Hexagonal perovskite (εr = 18, Qxf = 7700 GHz, τƒ = −14 ppm/°C) had decreased εr, τƒ and increased Qxf values, compared with the cubic perovskite phases. The phase formation and the relationship between structures and microwave dielectric properties were discussed.
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Document Type: Research Article

Publication date: 2012-05-01

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