Abstract
CaTi1−x(In0.5Nb0.5)xO3 (0.1 ≤ x ≤ 0.7) ceramics were prepared by a solid-state reaction method. Analysis of XRD data revealed the formation of single orthorhombic phase for all the compositions (0.1 ≤ x ≤ 0.7) and the unit cell volume increases linearly with x. SEM results also showed no evidence of secondary phase. The relative permittivity (er) and temperature coefficient of resonance frequency (τf) decreased and quality factor (Q × ƒ) increased with an increase in x from 0.1 to 0.7 except for x = 0.6. The er decreased with the increase of x, which was depended on the value of αD/Vm and cation “rattling effect”. The change of τf with x was related to the variation of the tolerance factor, which influenced the tilting of oxygen octahedral in perovskite structure. Optimum microwave dielectric properties (er ~43.72, Q × ƒ ~12453.48 GHz, τƒ ~3.07 ppm/°C) were achieved at x = 0.65, suitable for use in satellite broadcast systems due to high frequency selectivity.
Published Version
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