Dielectric properties of sintered materials prepared from glass-ZrO 2 -SrTiO 3 mixtures

Abstract

(Ca,Sr,Ba)O-Al2O3-SiO2-TiO2 glass powder was mixed with 6.7 mol % ZrO2 and 0–11.96 mol % SrTiO3. The mixtures were sintered at 850 °C, 900 °C or 950 °C. Most of the glass phase changed to crystalline phases of (Ca,Sr,Ba)2TiSi2O6TS, (Ca,Sr,Ba)Si2O6AS, ZrO2 and SrTiO3 during sintering. The dielectric properties of samples sintered at 900 °C were measured at 1 MHz using silver electrodes. With increasing SrTiO3 content, the dielectric constant increased from 12 to 19 and the temperature coefficient of dielectric constant, TCD, changed from -30 ppm ^C-1 to -400ppm^C-1. Using mixture equations, dielectric constants and TCD values were estimated for the samples and these values were compared with experimental results.