Low‐firing and temperature stable microwave dielectric ceramics: Ba ₂ LnV ₃ O ₁₁ (Ln = Nd, Sm)

Abstract

Abstract Low‐firing and temperature stable microwave dielectric ceramics of Ba 2 LnV 3 O 11 (Ln = Nd, Sm) were prepared by solid‐state reaction. X‐ray diffraction ( XRD ) and scanning electron microscopy ( SEM ) were used to investigate the phase purity, crystal structure, sintering behavior, and microstructure. The XRD patterns indicated that Ba 2 LnV 3 O 11 (Ln = Nd, Sm) ceramics belong to monoclinic crystal system with P2 1 / c space group in the whole sintering temperature range (800°C ‐900°C). Both ceramics could be well densified at 880°C for 4 hours with relative densities higher than 96%. The Ba 2 LnV 3 O 11 (Ln = Nd, Sm) samples sintered at 880°C for 4 hours exhibited excellent microwave dielectric properties: ε r = 12.05, Q × f = 23 010 GH z, τ f = −7.7 ppm/ °C , and ε r = 12.19, Q × f = 27 120 GH z, τ f = −16.2 ppm/ °C , respectively. Besides, Ba 2 LnV 3 O 11 (Ln = Nd, Sm) ceramics could be well co‐fired with the silver electrode at 880°C.