Crystal structure, Raman spectra and microwave dielectric properties of novel temperature-stable LiYbSiO4 ceramics
Crystal structure, Raman spectra and microwave dielectric properties of novel temperature-stable LiYbSiO4 ceramics
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DOI：
10.1016/j.ceramint.2020.05.070
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发表时间：
2020-08
影响因子：
5.2
通讯作者：
Congxue Su;Laiyuan Ao;Zhiwei Zhang;Yifan Zhai;Junqi Chen;Ying Tang;Laijun Liu;L. Fang
中科院分区：
文献类型：
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作者：
Congxue Su;Laiyuan Ao;Zhiwei Zhang;Yifan Zhai;Junqi Chen;Ying Tang;Laijun Liu;L. Fang
首次采用固相反应工艺制备了τf接近于零的橄榄石型结构微波介质陶瓷LiYbSiO4。研究了陶瓷的结构参数、烧结行为、振动模式和微波介电性能之间的关系。 εr 的变化可能与拉曼位移相关。 Q×f值的变化与FWMH和平均阳离子共价成反比。 τf值用阳离子的键价和来解释。单相LiYbSiO4陶瓷可以在1100–1140°C范围内获得，并表现出良好的微波介电性能，εr= 7.36 – 7.42，Q×f= 19081 – 25276 GHz，τf= +4.52 – +8.03 ppm/°C。
Olivine−type structure microwave dielectric ceramics LiYbSiO4with near-zero τfwere fabricated by solid-state reaction process for the first time. The relationships among structural parameters, sintering behavior, vibrational modes and microwave dielectric properties for the ceramics were studied. The variation inεrcould be correlated with Raman shift. The variation inQ×fvalues was inversely correlated to FWMH and average cation covalency. Theτfvalues were explained with the bond valence sum of cations. Single phase LiYbSiO4ceramics could be obtained at the range of 1100–1140 °C and showed promising microwave dielectric properties withεr= 7.36 – 7.42,Q×f= 19081 – 25276 GHz andτf= +4.52 – +8.03 ppm/°C.