Abstract
We investigated the dielectric properties of (Ba0.7Sr0.3−xCax)(Ti0.9Zr0.1)O3 (BSCTZ) and (Ba0.7−yCaySr0.3)(Ti0.9Zr0.1)O3 (BCSTZ) () ceramics sintered at 1550 °C for 6 h. With increasing Ca2+ ions substitution for Sr2+ and/or Ba2+ ions, both of the ceramics showed the decreasing unit cell volume due to the smaller ionic size of Ca2+ ion than Ba2+ and/or Sr2+ ion. Also, BSCTZ and BCSTZ ceramics were found to have perovskite structures with tetragonal (P4mm) and cubic () symmetry at room temperature. The dielectric constant (εr) and breakdown voltage of BSCTZ and/or BCSTZ ceramics depended on the average B-site bond valence. The dielectric loss (tan δ) of BSCTZ ceramics significantly increased with Ca2+ ions substitution due to the decrease in grain size, whereas that of BCSTZ ceramics decreased only slightly because of the increase in the cubic phase fraction. Finally, we discuss the dependence of the dielectric properties on the crystal structure characteristics of the BSCTZ and BCSTZ ceramics.
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