Crystal structure, infrared reflectivity spectra and microwave dielectric properties of CaAl2O4 ceramics with low permittivity
Crystal structure, infrared reflectivity spectra and microwave dielectric properties of CaAl2O4 ceramics with low permittivity
复制标题
低介电常数CaAl2O4陶瓷的晶体结构、红外反射光谱及微波介电性能
DOI：
10.1016/j.jallcom.2019.03.369
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发表时间：
2019-06-30
影响因子：
6.2
通讯作者：
Song, Kai Xin
中科院分区：
文献类型：
--
作者：
Liu, Bing;Hu, Cheng Chao;Song, Kai Xin
CaAl2O4 ceramics with low permittivity have been prepared via a solid state ceramic route. X-ray diffraction analysis and Rietveld refinement result demonstrated that CaAl2O4 ceramics belonged to the monoclinic structure with P2(1)/n space group. Dense ceramics with homogeneous microstructures were obtained when sintered at around 1450 degrees C, wherein excellent microwave dielectric properties (epsilon(r) = 8.9, Qf = 91,350 GHz, tau(f)= -55 ppm/degrees C) were achieved as well. Moreover, the infrared reflectivity spectra were measured and fitted to understand their intrinsic dielectric properties. Considering the merits of easy preparation, cheap raw materials and most importantly, the outstanding microwave dielectric properties, CaAl2O4 ceramics are expected to be promising candidates for low loss microwave dielectric ceramics. (C) 2019 Elsevier B.V. All rights reserved.
