Structural, infrared reflectivity spectra and microwave dielectric properties of the Li₇Ti₃O₉F ceramic
Zhang, Zhiwei; Fang, Liang; Xiang, Huaicheng; Xu, Minyu; Tang, Ying; Jantunen, Heli; Li, Chunchun (2019-06-01)
Zhiwei Zhang, Liang Fang, Huaicheng Xiang, Minyu Xu, Ying Tang, Heli Jantunen, Chunchun Li, Structural, infrared reflectivity spectra and microwave dielectric properties of the Li7Ti3O9F ceramic, Ceramics International, Volume 45, Issue 8, 2019, Pages 10163-10169, ISSN 0272-8842, https://doi.org/10.1016/j.ceramint.2019.02.065
© 2019 Published by Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2019052116350
Tiivistelmä
Abstract
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 of εᵣ = 22.5, Q×f = 88,200 GHz, and τf = −24.2 ppm/°C. 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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