Effects of BaO/WO3 ratio on the loss quality of complex perovskite Ba(Mg1/3Ta2/3)O3 were investigated as a function of the amount of (1-y)BaO-yWO3 (y=0.56, 0.8) from 0.3 wt.% to 7.0 wt.% at 10 GHz. The specimens with 1.5 wt.% of y=0.56 and/or with 1.0 wt.% of y=0.8 showed a maximum value of loss quality, respectively, and then decreased with an increase of additive content. The increase of loss quality with (1-y)BaO-yWO3, is resulted that the W6+ ions substitution of Ta5+ ions is enhanced the B-site ordering of Ba(Mg1/3Ta2/3)O3. The dielectric constant and temperature coefficient of resonant frequency (TCF) were decreased slightly with additives, which are due to the increase of BaWO4 phase as a secondary phase. The effects of additives on the intrinsic microwave losses of the specimens were investigated by the infrared reflectivity spectra from 50 to 4000 cm-1.
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