Microwave dielectric resonators based on Ba[(Bi0.2D0.33+)Nb-0.5]O-3 (D3+=Y,Pr,Sm,Gd,Dy,Er)

Dielectric rosantor ceramics with composition formula Ba[(Da(0.3)(3+)Bi(0.2))Nb-0.5]O-3, where D3+ = Y, Pr, Sm, Gd, Dy and Er, were prepared by the conventional ceramic preparation route. The dielectric properties at microwave frequencies were measured using a resonance method. The ceramics showed the dielectric constant (epsilon(r)) above 40 and Q x f> 1.5 x 10(I2). The temperature coefficient of resonant frequency (tau(f)) varied from -27 to +15 ppm K-1. The dielectric properties and low processing temperatures make these materials suitable for practical applications.