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Mechanochemical synthesis of PMN-PT powder

Several methods for preparation of lead magnesium niobate PbMg1/3Nb2/3 (PMN) solid solution with lead titanate PbTiO3 (PT) (PMN-PT) without undesirable pyrochlore phase have been developed. The formation of compounds by high energy milling at room temperature is desirable for PbO containing materials due to avoiding PbO evaporation.

Piezoelectric PbMg1/3Nb2/3 - PbTiO3 (PMN-PT) powders have been prepared by direct mechanochemical activation of precursors. Very slow kinetics of formation of PMN-PT solution from oxide powders was found out in the case of PMN rich solid solutions and high loading mass. Due to this new two step process was introduce. In the first step PT was formed by high energy milling and in the second phase PT was milled with the remaining oxide. The solid solution x PMN-(1-x) PT in the range of x=0.6-0.8 without pyrochlore phase was successfully sythesised by high energy milling at high mass ratio.

Reported by

Jozef Stefan Institute
39 Jamova
1001 Ljubljana
Slovenia
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