Structural, infrared reflectivity spectra and microwave dielectric properties of the Li7Ti3O9F ceramic
Structural, infrared reflectivity spectra and microwave dielectric properties of the Li7Ti3O9F ceramic
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Li7Ti3O9F陶瓷的结构、红外反射光谱和微波介电性能
DOI：
10.1016/j.ceramint.2019.02.065
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发表时间：
2019-06
影响因子：
5.2
通讯作者：
Li Chunchun
中科院分区：
文献类型：
--
作者：
Zhang Zhiwei;Fang Liang;Xiang Huaicheng;Xu Minyu;Tang Ying;Jantunen Heli;Li Chunchun
采用传统的固相反应法制备了立方相岩盐结构的Li 7 Ti 3 O 9 F陶瓷。采用X射线衍射（XRD）、热重分析仪、扫描电镜（SEM）和能谱仪（EDS）等测试手段研究了Li 7 Ti 3 O 9 F陶瓷的合成条件、烧结特性和微波介电性能。Rietveld精修、选区电子衍射（SAED）和高分辨透射电子显微镜（HRTEM）证实了Li 7 Ti 3 O 9 F具有立方岩盐结构。在950 °C烧结的陶瓷表现出最佳的微波性能：εr= 22.5，Q ×f= 88，200 GHz，τf= −24.2 ppm/oC。在950 °C下共烧2 h，证实了其与Ag具有良好的化学相容性。这些结果证实了Li 7 Ti 3 O 9 F陶瓷在低温共烧陶瓷（LTCC）技术中用作衬底的巨大潜力。本工作为通过氧化物和氟化物之间的固溶体开发低温烧成陶瓷提供了可能。
A cubic rock salt structured ceramic, Li7Ti3O9F, was fabricated via the conventional solid-state reaction route. The synthesis conditions, sintering characteristics, and microwave dielectric properties of Li7Ti3O9F ceramics were investigated by X-ray diffraction (XRD), thermal dilatometer, Scanning Electron Microscopy (SEM) accompanied with EDS mapping, and microwave resonant measurements. Rietveld refinement, selected area electron diffraction (SAED) pattern and high-resolution transmission electron microscopy (HRTEM) confirmed that Li7Ti3O9F adopts a cubic rock-salt structure. The ceramic sintered at 950 °C presented the optimal microwave properties ofεr= 22.5,Q×f= 88,200 GHz, andτf= −24.2 ppm/oC. Moreover, good chemical compatibility with Ag was verified through cofiring at 950 °C for 2 h. These results confirm a large potential for Li7Ti3O9F ceramic to be utilized as substrates in the low temperature cofired ceramic (LTCC) technology. This work provides the possibility to exploit low-temperature-firing ceramics through solid solution between oxides and fluorides.
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