摘要
Single phase Li_(2)W_(2)O_(7) with anorthic structure was prepared by the conventional solid-state reaction method at 550℃ and the anorthic structure was stable up to 660℃.The dielectric properties at radio frequency(RF)and microwave frequency range were characterized.The sample sintered at 640℃ exhibited the optimum microwave dielectric properties with a relative permittivity of 12.2,a quality factor value of 17,700 GHz(at 9.8 GHz),and a temperature coefficient of the resonant frequency of232 ppm/℃ as well as a high relative density~94.1%.Chemical compatibility measurement indicated Li_(2)W_(2)O_(7) did not react with aluminum electrodes when sintered at 640℃ for 4 h.
基金
This work was supported by Natural Science Foundation of China(Nos.21261007,21561008 and 51502047)
the Natural Science Foundation of Guangxi Zhuang Autonomous Region(Nos.2015GXNSFBA139234,2015GXNSFFA139003,2016GXNSFBA380134 and 2016GXNSFAA380018)
Project of Scientific Research and Technical Exploitation Program of Guilin(2016010702-2)
Projects of Education Department of Guangxi Zhuang Autonomous Region(Nos.YB2014160,KY2015YB341 and KY2015YB122)
the talent cultivation project for innovation and entrepreneurship of Beibu Gulf of Guangxi Zhuang Autonomous Region(2015-09).
