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Microwave Dielectric Properties of Ca4La2Ti5−x(Mg1/3Nb2/3)xO17 Ceramics

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Using the solid‐state ceramic route, Ca4La2Ti5−x (Mg1/3Nb2/3) x O17 (0 ≤  4) ceramics were prepared, and the phase purity, microstructure, and microwave dielectric properties were investigated. The XRD results suggest the formation of solid solutions for all studied compositions (0 ≤  4) and the unit cell volume increases linearly with x. The SEM results also show no evidence of secondary phase and doping (Mg1/3Nb2/3) at Ti site promotes the grain growth. The εr of sintered ceramics decreases from 71.86 to 35.23, the Q × f value increases from 15 070 to 21 277 GHz and the τ f value varies from 125.2 to −16.7 ppm/°C with x increasing from 0 to 4. A near‐zero τ f (~1.62 ppm/°C) is achieved at = 3 with εr ~ 40.45 and × ~ 19 123 GHz.
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Document Type: Research Article

Publication date: April 1, 2012

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