材料科学
陶瓷
电介质
氟化物
烧结
相对介电常数
氟化锂
介电常数
结构精修
极化率
温度系数
介电损耗
分析化学(期刊)
矿物学
复合材料
无机化学
晶体结构
结晶学
化学
光电子学
有机化学
分子
作者
Xiaoqiang Song,Kang Du,Jie Li,Xue‐Kai Lan,Wenzhong Lü,Xiao‐Hong Wang,Wen Lei
标识
DOI:10.1016/j.ceramint.2018.09.164
摘要
Low-fired fluoride microwave dielectric ceramics (LiF, CaF2, SrF2 and BaF2) were prepared through a simple one-step sintering process. Fluoride ceramics, especially LiF, which had the lowest sintering temperature of 800 °C, could be well sintered below 1050 °C. Rietveld refinement results showed that LiF, CaF2, SrF2 and BaF2 ceramics crystallized into a cubic structure with space group Fm-3m. The relative permittivity (εr), quality factor (Q × f) and temperature coefficient of the resonant frequency (τf) of the fluoride ceramics were closely related to relative density, the ionic polarizability of the primitive unit cell, the packing fraction and the bond valence. In this series of low-permittivity fluoride ceramics, LiF, CaF2 and BaF2 could be co-fired with Ag powders, and LiF ceramic exhibited the highest Q×f value of 73880 GHz, which is comparable to those of traditional oxide microwave dielectric ceramics.
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