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Erschienen in:
01.01.2015
The improvement research on microwave dielectric properties of magnesium tungstate for LTCC
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 1/2015
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Abstract
The MgWO4 and Li2Mg2(WO4)3 ceramics for LTCC application were prepared by the conventional solid-state sintering method. The effect of lithium compounds addition on the densification, phase development, microstructure and microwave dielectric properties of the magnesium tungstate ceramics was investigated. Adding Li2CO3 to the MgO–WO3 in different order, the result showed that the densification and main crystalline phases were different, and the change of microstructures was conspicuous. The optimal sintering temperature of dense Li2Mg2(WO4)3 ceramic approximately ranged from 825 to 875 °C for 3 h, and the sintering temperature of MgWO4 ceramic can be reduced to 950 °C by adding Li2CO3. When the ceramics were dense enough, the MgWO4 ceramics with 9.0 wt% Li2CO3 had negative τ
f
values of −76 ppm/°C, but the τ
f
values of the Li2Mg2(WO4)3 ceramics were near 0 ppm/°C.