Effects of Dy doping amount and sintering process on the structure and dielectric properties of Sr_1-3x/2Dy_xTiO₃ ceramics

The Sr(1-3x/2)DyxTiO(3) (x = 0.005, 0.01, 0.015, 0.02, 0.04, 0.06) ceramics are prepared sintered in N2 / air through a solid-state synthesis method. The effects of Dy doping amount and sintering process on the structure and dielectric properties of Sr(1-3x/2)DyxTiO(3) ceramics were systematically investigated. We identify a novel Sr1-3x/2Dy(x)TiO(3) ceramic system sintered in N2 that exhibits the most superior dielectric performance when x = 0.01. At room temperature, the epsilon r and tan delta of Sr0.985Dy0.01TiO3 ceramic sintered in N-2 are 29,000 and 0.07 at a frequency of 1 kHz, and 27,000 and 0.01 at a frequency of 10 kHz, respectively. Additionally, the epsilon r of Sr0.985Dy0.01TiO3 ceramics sintered in N-2 has an excellent temperature stability at high temperatures, with a change rate within the range of +/- 15% at a frequency of 10 kHz ranging from 30 to 480 celcius. Through comparing Sr0.985Dy0.01TiO(3) ceramic sintered in air, sintering in N-2 significantly improved its epsilon r and thermal stability. This study demonstrates that the improvement of processing techniques and doping strategies have enhanced the dielectric properties of the ceramics.