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Citation: CUI Bin, GAO Xiu-Hua, LIANG San, LI Heng-Xin, SHI Qi-Zhen. Reaction Mechanism of Preparation 0.5Pb(Mg_1/2W_1/2)O₃-0.5PbTiO₃ Powders by Semichemical Method[J]. Chinese Journal of Applied Chemistry, ;2004, 21(12): 1237-1240. shu

Reaction Mechanism of Preparation 0.5Pb(Mg_1/2W_1/2)O₃-0.5PbTiO₃ Powders by Semichemical Method

1.
Department of Chemistry, Northwest University, Shaanxi Provincial Key Laboratory of Physico-Inorganic Chemistry, Xi'an 710069

Corresponding author: CUI Bin,
Received Date: 12 February 2004
Available Online: 20 June 2004
Fund Project: 陕西省自然科学基金(2001H06) (2001H06)陕西高校省级重点实验室重点科研基金(02JS12)资助项目 (02JS12)

The mechanism of the preparation of 0.5Pb(Mg_1/2W_1/2)O₃-0.5PbTiO₃(PMW-PT) powder by the semichemical method was studied. The precursors were prepared by addition of an aqueous Mg(Ac)₂ solution into the alcohol slurry of PbO, WO₃ and TiO₂ instead of solid MgO commonly used. The TG-DTG-DSC analyses of the precursors and XRD analyses of the powders obtained at different calcination temperatures show that the mechanism of this method is different from that of the conventional mixed oxide method. The aqueous Mg(Ac)₂ solution reacts with PbO to form Pb(Ac)₂·Pb(OH)₂·H₂O, Pb(Ac)₂·2PbO·H₂O and Mg(OH)₂, which decompose to form nascent PbO and MgO, significantly improving the reactivity and dispersion of PbO and MgO. The method requires much lower temperature for the formation of the perofskite PMW-PT phase. At a calcination temperature of 850℃, PMW-PT powder with 99% perofskite phase could be obtained.
- lead magnesium tungstate,
- perofskite phase,
- semichemical method,
- reaction mechanism
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Reaction Mechanism of Preparation 0.5Pb(Mg1/2W1/2)O3-0.5PbTiO3 Powders by Semichemical Method

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Reaction Mechanism of Preparation 0.5Pb(Mg_1/2W_1/2)O₃-0.5PbTiO₃ Powders by Semichemical Method