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无机材料学报

无机材料学报

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半化学法制备0.80Pb(Mg1/3Nb2/3)O3-0.20PbTiO3陶瓷的反应机理

崔斌1,2; 杨祖培1; 侯育冬1; 田长生2; 史启祯1   

  1. 1. 西北工业大学材料科学与工程学院, 西安 710072; 2. 西北大学化学系陕西省物理无机化学重点实验室 西安 710069
  • 收稿日期:2001-09-26 修回日期:2001-11-20 出版日期:2002-07-20 网络出版日期:2002-07-20

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

CUI Bin1,2; YANG Zu-Pei1; HOU Yu-Dong1; SHI Qi-Zhen2; TIAN Chang-Sheng1   

  1. 1. College of Materials Science and Engineering; Northwestern Polytechnical University; Xi an 710072; China; 2. Department of Chemistry; Northwest University/Shanxi Key Laboratory of Physico-Inorganic Chemistry, Xi'an 910069, China
  • Received:2001-09-26 Revised:2001-11-20 Published:2002-07-20 Online:2002-07-20

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摘要： 采用半化学法制备了纯钙钛矿相的0.80Ph（Mg1/3Nb2/3）O3-0.20PbTiO3（简称为0.80PMN-0.20PT）陶瓷.反应前驱体是以硝酸镁的饱和溶液代替传统氧化物混合法中的氧化镁,与PbO、Nb2O5和 TiO2混合球磨得到的.该前驱体的TG-DTG-DSC和XRD分析表明,半化学法的反应机理不同于传统氧化物混合法和二次合成法的反应机理.在煅烧过程中,硝酸镁与氧化铅反应生成铅的活化中间体Pb6O5（NO3）2,由此活化的PbO或Pb3O4可与Nb2O5生成不稳定的、缺B位的焦绿石相Pb3Nb2O8;再与MgO反应生成钙钛矿相PMN-PT.

关键词: 半化学法, 反应机理, 铌镁酸铅, 钙钛矿相

Abstract: The semichemical method was developed for the synthesis of 0.80Pb(Mg1/3Nb2/3)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

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