Preparation, characterization and microwave dielectric properties of Ba(B′_(1/2)Nb_(1/2))O_3 [B′= La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Yb and In] ceramics

摘要

Microwave dielectric resonators (DRs) based on Ba(B′_(1/2)Nb_(1/2))O_3 [B′= La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Yb, and In] complex perovskites have been prepared by conventional solid state ceramic route. The dielectric properties (relative permittivity, ε_r; quality factor, Q; and resonant frequency, τ_f) of the ceramics have been measured in the frequency range 4-6 GHz using resonance methods. The resonators have relatively high dielectric constant in the range 36-45, high quality factor and small temperature variation of resonant frequency. The dielectric properties are found to depend on the tolerance factor (t), ionic radius (r), and lattice parameter (a_p).