Enhanced dielectric tunability of Ba x Sr1−x TiO3–MgO composite ceramics co-modified with CuO and MnO2

Abstract

0.55Ba x Sr 1-x TiO 3 -0.45MgO composite ceramics (BST-MgO, x = 0.5-0.65) co-modified with CuO and MnO 2 were prepared by conventional soild state reaction method. The microstructure, phase and morphology were investigated. The results showed the formation of the perovskite BST phase and MgO phase. The dielectric constant (e r ) and tunability (T) of the ceramic samples increased with increasing Ba content. The dielectric loss (tan d) and figure of merit achieved their minimum and maximum at x = 0.6, respectively. The obtained ceramic sample with x = 0.6 exhibited favorable properties, which are listed as follows: e r = 190, tan d = 0.22 %, T = 16 %, E c = 5.6 kV/cm and FOM = 72.7.

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