Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 8, Pages 10163-10169Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.02.065
Keywords
Microwave dielectric ceramic; Low-temperature cofired ceramic technology (LTCC); Oxyfluoride; Li7Ti3O9F
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Funding
- Natural Science Foundation of China [21561008, 51502047, 21761008]
- Natural Science Foundation of Guangxi Zhuang Autonomous Region [2015GXNSFFA139003, 2016GXNSFBA380134, 2016GXNSFAA380018, 2018GXNSFAA281253, 2018GXNSFAA138175]
- Project of Scientific Research and Technical Exploitation Program of Guilin [20170225]
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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 degrees C presented the optimal microwave properties of epsilon(r) = 22.5, Qxf = 88,200 GHz, and tau(f) = 24.2 ppm/degrees C. Moreover, good chemical compatibility with Ag was verified through cofiring at 950 degrees 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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