Effects of Magnesium Doping on Phase Transitions and Dielectric Figure of Merit of Barium Strontium Titanate Ceramics

Ba0.6Sr0.4(Ti1−xMgx)O3 (BSTM) ceramics were prepared by using a solid-state reaction process. X-ray diffraction results indicated that the solubility limit of Mg in Ba0.6Sr0.4TiO3 was about 3 mol%. Doping of Mg into BST led to diffused cubic–tetragonal (C–T) phase transition and reduced Curie temperature. The diffused parameter γ obtained by fitting the modified Curie–Weiss laws increased with increasing Mg content. Dielectric properties of the BSTM ceramics were measured. Figure of merit of BSTM3 was up to 127.8 at 17.5 kV/cm. Its dielectric loss was as low as 0.00133 at 1 kHz and room temperature.

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