Reaction Mechanism of 0.80Pb(Mg1/3Nb2/3)O3 -0.20PbTiO3 Ceramics Prepared by Semichemical Method

Abstract

Abstract: The semichemical method was developed for the synthesis of 0.80Pb(Mg_1/3Nb_2/3)O₃-0.20PbTiO₃(0.80PMN-0.20PT) ceramics with pure perovskite phase. The precursors were prepared
by adding an aqueous Mg(NO₃)₂ solution rather than MgO to the alcoholic slurry of PbO, TiO₂ and Nb₂O₅. The TG-DTG-DSC and XRD analysis show that the
mechanism in this method is different from those of the known columbite or conventional mixed oxide method. Mg(NO₃)₂ reacts with PbO to form a intermediate of Pb₆O₅(NO₃)₂
at milling and calcinations process. The activated PbO and Pb₃O₄ by the intermediate reacted with Nb₂O₅ to form an unstable B-deficient pyrochlore structure of Pb₃Nb₂O₈，which progressively inserts magnesium oxide to transform into PMN-perovskite phase.

Key words: semichemical method, lead magnesium niobate, reaction mechanism, perovskite phase

CLC Number:

TQ174
O742

CUI Bin,YANG Zu-Pei,HOU Yu-Dong,SHI Qi-Zhen,TIAN Chang-Sheng. Reaction Mechanism of 0.80Pb(Mg_1/3Nb_2/3)O₃ -0.20PbTiO₃ Ceramics Prepared by Semichemical Method[J]. Journal of Inorganic Materials.

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Reaction Mechanism of 0.80Pb(Mg_1/3Nb_2/3)O₃ -0.20PbTiO₃ Ceramics Prepared by Semichemical Method

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