Microwave dielectric properties of rutile (Zn 1/3Nb 2/3) 0.40(Ti 1− xSn x) 0.60O 2 (0.15 ≤ x ≤ 0.30) ceramics

Abstract

Microwave dielectric properties of (Zn 1/3Nb 2/3) 0.40(Ti 1− x Sn x ) 0.60O 2 ceramics were investigated as a function of SnO 2 content (0.15 ≤ x ≤ 0.30). A single phase with tetragonal rutile structure was obtained through the entire composition. The unit-cell volume of the specimens was increased with SnO 2 content, due to the larger ionic radius of Sn 4+ (0.69 Å) than that of Ti 4+ (0.605 Å) for octahedral site. Dielectric constant ( K) of the sintered specimens was affected by the dielectric polarizability. Quality factor ( Qf) was dependent on the degree of reduction of Ti 4+ ion. With an increase of SnO 2 content, the temperature coefficient of resonant frequency ( TCF) of the specimens decreased due to the decrease of the octahedral distortion of rutile structure.