Microwave dielectric properties of low firing temperature stable scheelite structured (Ca,Bi)(Mo,V)O4 solid solution ceramics for LTCC applications

In the present work, a systematic study on microwave properties of Ca1-xBixMo1-xVxO4 (0.2 <= x <= 0.5) solid solution ceramics synthesized by using the traditional solid-state reaction method was conducted. A scheelite structured solid solution was formed in the composition range 0.2 <= x <= 0.5. We successfully prepared a microwave dielectric ceramic Ca1-xBixMo1-xVxO4 with a temperature coefficient of resonant frequency (TCF) near to zero and a low sintering temperature by using (Bi, V) substituted (Ca, Mo) in CaMoO4 to form a solid solution. The Ca1-xBixMo1-xVxO4 ceramic can be well sintered at only 870 degrees C and exhibits good microwave dielectric properties with a permittivity (epsilon(r)) (similar to)21.9, a Qf (similar to)18,150 GHz (at 7.2 GHz) (Q = quality factor = 1/dielectric loss; f = resonant frequency), a TCF similar to + 0.1 ppm/ degrees C. The chemical compatibility with silver indicated that the Ca1-xBixMo1-xVxO4 ceramic might be a good candidate for the LTCC applications.