The characteristics of Ba(Mg1/3Ta2/3)O3, BMT materials
synthesized by a two-step process, consisting of the formation of
B-site compounds, e.g., MgTa2O6, followed by the formation of a BMT
perovskite, were compared with the properties of BMT powders prepared
by the conventional single-step mixed-oxide route. BMT powders
prepared by the two-step process exhibits superior reactivity compared
to those synthesized by the single-step process. The single-phase
perovskite can be formed at a lower calcination temperature (900°C)
and high density ceramic materials can be obtained at a lower
sintering temperature with a short period of time (1500°C, 2 h). When the Ba5Ta4O15 is incorporated into pure BMT perovskite, the
sintered density of BMT materials decreases significantly, and the
dielectric constant (K) and temperature coefficient of resonance
frequency (τf) are not altered significantly, but the Q-factor of
the BMT materials decreases signicantly. These observations imply that
the mechanism by which the two-step process significantly improves the
densification process and the related microwave dielectric properties
is the effective suppression of formation of the secondary phase,
Ba5Ta4O15.
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