How Synthesis Parameters Influence the Quality of Lead Magnesioniobate PbMg1/3Nb2/3O3статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Lead magnesioniobate PbMg1/3Nb2/3O3 (PMN) has been prepared using lead oxide and magnesium niobate. Factors that influence the perovskite/pyrochlore ratio in the PMN structure have been studied. In order for the maximal amount of the perovskite phase to be obtained, synthesis should be carried out at 850-900 degrees C; an excess of MgO (1-5 wt %) does not exert a positive effect. An excess of PbO (5-7 wt %) allows one to obtain a phase that contains 85% PMN, with the perovskite structure. The perovskite lattice is found to be stabilized as a result of cationic substitutions (Yb, Lu) in the Mg-Nb sublattice due to the formation of solid solution Pb(Mg1/3Nb2/3)(1 - x)Yb(Lu)(x)O-3, where 0 <= x <= 0.9.