Thermal transformations of lead oxides

被引:37
作者
Gavrichev, K. [1 ]
Bolshakov, A. [1 ]
Kondakov, D. [1 ]
Khoroshilov, A. [1 ]
Denisov, S. [2 ]
机构
[1] Kurnakov Inst Gen & Inorgan Chem, Moscow 119991, Russia
[2] Ural Electrochem Integrated Plant Novouralsk, Ekaterinburg, Sverdlovsk Reg, Russia
关键词
lead oxide; nanoparticles; phase transition; thermal properties;
D O I
10.1007/s10973-007-8590-x
中图分类号
O414.1 [热力学];
学科分类号
摘要
Differential scanning calorimetry, differential thermogravimetry, X-ray analysis and electronic microscopic studies of thermal transformations of PbO2 were carried out. Formation of fine dispersed (less than 100 nm) particles of alpha-PbO was observed at PbO2 thermal decomposition at heating to 580 degrees C. Reverse reaction of Pb3O4 formation from PbO was found at cooling and annealing at 400 degrees C in air. At heating of alpha-PbO to 650 degrees C the particle growth to 1 mu m with formation of beta-PbO took place. Thermal decomposition with formation of beta-PbO particles with size from 0.3 to 1 mu m at PbO2 heating to 650 degrees C was observed. Transition from PbO to Pb3O4 at cooling of sample heated to 650 degrees C was not detected. Interpretation of observed phenomena from the point of view of particle size influences on the shift of alpha-PbO <->beta-PbO phase transition temperature and on the chemical activity of phases are presented.
引用
收藏
页码:857 / 863
页数:7
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