Effect of eutectic lithium sulfate-sodium sulfate flux on the synthesis of lead magnesium niobate

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Abstract
The effect of the amount of sulfate flux (Li2SO4-Na2SO4) on the phase stability and dielectric properties of lead magnesium niobate ceramics prepared by molten salt synthesis, has been studied as a function of calcining and sintering temperatures. The percentage of perovskite phase tended to increase with increasing the amount of flux and calcination temperature. When powders containing the same amount of flux with respect to starting oxides were calcined at 750°C for 2 h, the pyrochlore phase was about 2%. Above 800°C, the perovskite phase was stable at about 97% regardless of the amount of flux. However, the increase of the amount of sulfate flux resulted in an increase of the average particle size and a decrease of dielectric constant. These results can be explained by the sinterability and microstructure analysis.

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