Abstract
This study investigated the influence of W6+ ions in BaMo1-xWxO4 (0 ≤ x ≤ 0.2) ceramics on its crystallization, sintering behavior, microwave dielectric property and chemical stability with Ag/Cu electrode metals. BaMoO4-based ceramics can be densified well, and its sintering temperature can be lowered below 900 °C due to the formation of a BaMo1-xWxO4 solid solution with a tetragonal scheelite structure. The value of εr decreases from approximately 8.9 to 8.2 with the increase of the W6+ content from 0 to 20 mol%. Compared with BaMoO4 ceramics, the incorporation of W6+ ions clearly increases the Q × f values of ceramics and increases the τf values from -95.14 ppm/°C to -50.51 ppm/°C. The BaMo0.85W0.15O4 sample has the largest Q × f value and exhibits the optimal microwave dielectric property: εr =8.57 and Q × f = 33244 GHz. BaMo1-xWxO4 ceramics exhibit chemical stability on two most promising electrode materials (i.e., Cu and Ag) during the cofiring process. This material is an inexpensive and high-performance LTCC candidate that advances the progress of microelectronic multilayer components.
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