Bond ionicity, lattice energy, bond energy, and microwave dielectric properties of Ca1-xSrxWO4 ceramics

作者：Xiao, Mi^*; Sun, Hongrui; Zhou, Ziqi; Zhang, Ping^*

来源：Ceramics International, 2018, 44(17): 20686-20691.

DOI：10.1016/j.ceramint.2018.08.062

• Microwave properties
• Bond iconicity
• Lattice energy
• Bond energy

The Ca1-xSrxWO4 (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) ceramics were fabricated through solid-state reaction, and the relationships among microwave dielectric properties of Ca1-xSrxWO4, bond ionicity, lattice energy and bond energy were systematically investigated for the first time. The patterns of X-ray diffractions of Ca1-xSrxWO4 presented tetragonal scheelite structure and no second phase appeared throughout the entire compositions. Dielectric properties of Ca1-xSrxWO4 were proved to be related to the microstructures: dielectric constant (epsilon(r)) of Ca1-xSrxWO4 was dependent on the bond ionicity; the quality factor (Q x f(0)) of Ca1-xSrxWO4 was affected by W-site lattice energy when intrinsic loss is dominant; the temperature coefficient of resonant frequency (vertical bar iota(f)vertical bar) would increase if B-site bond energy decreased. Ca1-xSrxWO4 ceramic showed excellent microwave dielectric properties, epsilon(r) = 9.42, Q x f(0) = 79876 GHz and iota(f) = -18.8 ppm/degrees C when x = 0.08 and sintered at 1100 degrees C for 4 h.

• 出版日期2018-12-1
• 单位天津大学