Tunability and Dielectric Properties of Ba_1–xSr_xTi_0.94Sn_0.06O₃ Ceramics

Abstract

The Ba _{1 − x} Sr _x Ti _0.94 Sn _0.06 O ₃ (BSTS) ceramics were prepared by solid-state reaction method. The microstructure was studied by scanning electron microscopy. The dielectric constant and loss as a function of temperature and external bias electric field were investigated. As strontium concentration increasing, the peak permittivity decreases. The Curie temperature decreases at an average rate of 2.86°C/mol% as the concentration of Sr^{2 +} increases in the system of BS _x TS _0.06 . The maximum tunability of 63.5% at applied electric field of 6 kV/cm was obtained with the composition of Ba _0.8 Sr _0.2 Ti _0.94 Sn _0.06 O ₃ .

Keywords:

• Ba _{1 −} xSr _x Ti_0.94Sn_0.06O₃
• Co-doped
• dielectric properties
• tunability

Acknowledgments

This work was supported by Shanghai Pujiang Program (No. 06PJ14091) and Supported by Program for Young Excellent Talents in Tongji University.