Microwave dielectric properties and low temperature firing of (1 - x)Li_2Zn_3Ti_4O_(12)-xLi_2TiO_3 (0.2≤x≤0.8) ceramics with B_2O_3-CuO addition

摘要

In the present work, the (1 - x)Li_2Zn_3Ti_4O_(12)-xLi_2TiO_3 (0.2 ≤ x≤0.8) ceramics were prepared via the solid state reaction method. The 0.8Li_2Zn_3Ti_4O_(12)-0.2Li_2TiO_3 ceramic sample sintered at 1,160℃ for 2 h demonstrated high microwave dielectric property with a relative permittivity of 18.0, a high quality factor (Q×f)～100,000 GHz (at 7.2 GHz), and a temperature coefficient of resonant frequency about -47.8 ppm/℃. With 2.0 wt% 0.4B_2O_3-0.6CuO addition, a relative permittivity of 17.5, a Q f value of 71,000 GHz and a temperature coefficient of resonant frequency of -44.4 ppm/℃ Can be obtained in 0.8Li_2Zn_3Ti_4O_(12)-0.2Li_2TiO_3 ceramic sintered at 925℃ For 5 h and the chemical compatibility with silver electrode indicates that the ceramics may be a suitable candidate for the low temperature co-fired ceramic technology application.