The addition of Li2CO3 to Sr2V2O7 ceramics decreased their sintering temperature and time. A dense microstructure was developed for the specimens sintered at 750°–850°C due to the melting of Li2CO3 during the sintering. For the specimens sintered at 800°C, the grain size was considerably increased when the Li2CO3 content exceeded 1.0 mol%. The Q×f value was increased by the Li2CO3 addition due to the increased density and grain size. In particular, a high Q×f value of 73 800 GHz with r and f values of 9.94 and −28.8 ppm/°C, respectively, was obtained for the specimen containing 3.0 mol% Li2CO3 sintered at 800°C for 2h.
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Document Type: Research Article
Department of Materials Science and Engineering, Korea University, Seoul 136-701, South Korea
Korea Institute of Ceramic Engineering and Technology, Seoul 153-801, South Korea
Publication date: August 1, 2010