Ultralow-fired Li2Mg3TiO6-Ca0.8Sr0.2TiO3 composite ceramics with temperature stable at microwave frequency

New temperature stable 4 wt% LiF-doped (1−x)Li2Mg3TiO6-xCa0.8Sr0.2TiO3 (LMT-CST, x = 0.10, 0.15, 0.20, 0.25) composite ceramics were fabricated by solid-state reaction for developing ultra-low temperature (≤800 °C) sintering microwave dielectric ceramics. Sintering temperatures of LMT-CST ceramics w...

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Veröffentlicht in:Journal of alloys and compounds 2017-06, Vol.709, p.299-303
Hauptverfasser: Ma, Jianli, Fu, Zhifen, Liu, Peng, Zhao, Liping, Guo, Baochun
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Sprache:eng
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Zusammenfassung:New temperature stable 4 wt% LiF-doped (1−x)Li2Mg3TiO6-xCa0.8Sr0.2TiO3 (LMT-CST, x = 0.10, 0.15, 0.20, 0.25) composite ceramics were fabricated by solid-state reaction for developing ultra-low temperature (≤800 °C) sintering microwave dielectric ceramics. Sintering temperatures of LMT-CST ceramics were successfully lowered to 725 °C due to LiF liquid-phase sintering and well-densified microstructures were obtained at 800 °C. Excellent microwave dielectric properties of εr = 18.8, Q × f = 48200 GHz (at 8.2 GHz), τf = 0.3 ppm/°C was obtained at 800 °C for 0.8 LMT-0.2CST-4wt% LiF ceramics. Such sample was compatible with Ag electrodes, which suggests suitability of the developed material for LTCC applications. •Ultralow-fired LiF-doped Li2Mg3TiO6-Ca0.8Sr0.2TiO3 composite ceramics were prepared.•LiF Addition lowered sintering temperature of LMT-CST ceramics to 725 °C.•The temperature stability of LMT-CST ceramics was improved by adding CST.•A near zero τf values of 0.3 ppm/°C is obtained for LMT-CST ceramics at 800 °C.•Ceramics with well dielectric properties are suitable for LTCC applications.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.03.103