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Structure characterization and microwave dielectric properties of LiGa5O8 ceramic with low-εr and low loss
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2020-06-09 , DOI: 10.1016/j.jeurceramsoc.2020.06.017
Laiyuan Ao , Ying Tang , Jie Li , Weishuang Fang , Lian Duan , Congxue Su , Yihua Sun , Laijun Liu , Liang Fang

LiGa5O8 ceramics with inverse spinel structure were prepared in a temperature range of 1200–1300 ℃ by solid-state reaction method. LiGa5O8 ceramics crystallized in cubic structure with space group P4332, in which Li+ and Ga3+ distributed in the octahedral B sites with 1:3 ordering. The optimal microwave dielectric properties with εr =10.51, Q × f = 127,040 GHz, and τf = –60.16 ppm/℃ were achieved at 1260 ℃ for 6 h. Microwave dielectric properties were discussed in combination with the intrinsic characteristics of crystal structure by packing fraction, Raman spectra, and infrared reflectivity spectrum. Additionally, CaTiO3 was used to suppress τf of LiGa5O8 ceramics to near zero, and optimized performances of εr = 12.79, Q × f = 109,752 GHz and τf = +4.07 ppm/℃ were obtained for 0.94LiGa5O8‐0.06CaTiO3 ceramics at 1260 ℃. These bright spots make LiGa5O8 ceramic a potential candidate for 5 G and millimeter wave technology.



中文翻译:

εr低损耗的LiGa 5 O 8陶瓷的结构表征和微波介电性能

采用固相反应法在1200〜1300℃的温度范围内制备了具有尖晶石结构的LiGa 5 O 8陶瓷。LiGa 5 O 8陶瓷以立方结构结晶,空间群为P 4 3 32,其中Li +和Ga 3+以1:3的顺序分布在八面体B位。具有最佳微波介电性能ε - [R = 10.51,Q×F = 127040千兆赫,和τ ˚F = -在1260℃加热6 h达到60.16 ppm /℃。通过堆积分数,拉曼光谱和红外反射率光谱,结合晶体结构的固有特性,讨论了微波介电性能。此外,的CaTiO 3被用来抑制τ ˚F LIGA的5个ø 8的陶瓷到接近零,和优化的性能ε - [R  = 12.79,Q×˚F  = 109752 GHz和τ ˚F = 4.07 PPM /℃是为获得0.94LiGa 5在1260℃下使用O 8 -0.06CaTiO 3陶瓷。这些亮点使LiGa 5 O 8 陶瓷是5 G和毫米波技术的潜在候选者。

更新日期:2020-06-09
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