Dielectric properties of rutile structure (Zn1/3B2/3)x(TiySn1ߝy)1ߝxO2 (B=Nb5+,Ta5+) at microwave frequencies

摘要

The microwave dielectric properties of rutile (Zn1/3B2/3)x(TiySn1ߝy)1ߝxO2 (B = Nb5+, Ta5+, 0.05 ʧD; x ʧD; 0.35, y = 0.2, 0.8) were investigated with structural characteristics. A single phase with tetragonal rutile (P42/mnm, no. 136, Z = 2) structure was obtained through the entire range of compositions. With an increase of (Zn1/3B2/3)O2 content, the dielectric constant (K) of sintered specimens with (Ti0.2Sn0.8) O2 increased, whereas that of the specimens with (Ti0.8Sn0.2) O2 decreased. The temperature coefficient of resonant frequency (TCF) of sintered specimens was dependent upon oxygen octahedral distortion and/or cations bond valence of the rutile structure. The quality factor (Qf) was dependent upon (Zn1/3B2/3)O2 content, and the specimens with (Ti0.2Sn0.8)O2 showed larger Qf values than those with (Ti0.8Sn0.2)O2 for the same content of (Zn1/3B2/3)O2.