Preparation, characterization and microwave dielectric properties of Ba(B′1/2Nb1/2)O3 [B′ = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Yb and In] ceramics

Microwave dielectric resonators (DRs) based on Ba(B'Nb-1/2(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, E,; quality factor, Q; and resonant frequency, pi(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)). (C) 2003 Elsevier B.V. All rights reserved.