Effect of Li2CO3 Addition on the Sintering Temperature and Microwave Dielectric Properties of Mg2V2O7 Ceramics

초록

Li2CO3 was added to Mg2V2O7 ceramics in order to reduce the sintering temperature to below 900 degrees C. At temperatures below 900 degrees C, a liquid phase was formed during sintering, which assisted the densification of the specimens. The addition of Li2CO3 changed the crystal structure of Mg2V2O7 ceramics from triclinic to monoclinic. The 6.0 mol% Li2CO3-added Mg2V2O7 ceramic was well sintered at 800 degrees C with a high density and good microwave dielectric properties of epsilon(r)=8.2, Q x f=70 621 GHz, and tau(f)=-35.2 ppm/degrees C. Silver did not react with the 6.0 mol% Li2CO3-added Mg2V2O7 ceramic at 800 degrees C. Therefore, this ceramic is a good candidate material in low-temperature co-fired ceramic multilayer devices.

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