Microwave Dielectric Properties of (Pb, Ca)(Mg, Nb, Sn)O₃ Ceramics

Abstract

The microwave dielectric properties of (Pb 0.4 Ca 0.6 ){(Mg 1/3 Nb 2/3 ) 1- x Sn x }O 3 (0≤ x ≤0.1) ceramics have been investigated. The (Pb 0.4 Ca 0.6 )(Mg 1/3 Nb 2/3 )O 3 ceramic was tetragonal complex perovskite single phase material and single phase specimens having tetragonal complex perovskite could also be obtained in case of substituting by tin(Sn). The partial substitution of [Mg 1/3 Nb 2/3 ] 4+ by Sn 4+ at B-site of the perovskite structure significantly improves the loss quality factor ( Q ) and slightly decreases dielectric constant ( ε r ) and temperature coefficient of resonant frequency (τ f ). The temperature coefficient of resonant frequency of 0 ppm/°C was realized at x =0.01. The Q · f o value and ε r for this composition were found to be 7130 GHz and 64.7 respectively.