Structure and microwave dielectric properties of Ba3Ti4−x (Fe1/2Nb1/2) x Nb4O21 solid solutions
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Ba3Ti4−x (Fe1/2Nb1/2) x Nb4O21 (0 ≤ x ≤ 4) ceramics with the substitution of (Fe1/2Nb1/2) for Ti were investigated. The modified Ba3Ti4Nb4O21 dielectric ceramics prepared via the solid state reaction route exhibited single hexagonal structure. The dielectric constant and the quality factor of Ba3Ti4−x (Fe1/2Nb1/2) x Nb4O21 (0 ≤ x ≤ 4) ceramics decreased with an increase of x. Improved temperature coefficient of the resonant frequency of samples was obtained by the substitution of (Fe1/2Nb1/2) for Ti. Optimal microwave dielectric properties of ε r = 50, Q × f = 5200 GHz, and τ f = 10 ppm/°C in Ba3Ti2(Fe1/2Nb1/2)2Nb4O21 were obtained, which indicated its potential for microwave application.