Thermal transformations of lead oxides

K. Gavrichev; A. Bolshakov; D. Kondakov; A. Khoroshilov; S. Denisov

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Thermal transformations of lead oxides

机译：氧化铅的热转变

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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 α-PbO was observed at PbO2 thermal decomposition at heating to 580°C. Reverse reaction of Pb3O4 formation from PbO was found at cooling and annealing at 400°C in air. At heating of α-PbO to 650°C the particle growth to 1 μm with formation of β-PbO took place. Thermal decomposition with formation of β-PbO particles with size from 0.3 to 1 μm at PbO2 heating to 650°C was observed. Transition from PbO to Pb3O4 at cooling of sample heated to 650°C was not detected. Interpretation of observed phenomena from the point of view of particle size influences on the shift of α-PbO?β-PbO phase transition temperature and on the chemical activity of phases are presented.

机译：进行了差示扫描量热法，差示热重分析，X射线分析和PbO2热转变的电子显微镜研究。在加热到580℃的PbO2 热分解中观察到了α-PbO的细分散（小于100nm）颗粒的形成。在空气中于400℃冷却和退火时，发现由PbO形成Pb3 O4 的逆反应。在将α-PbO加热到650°C时，随着β-PbO的形成，颗粒生长到1μm。观察到在加热到650°C时PbO2 的尺寸为0.3-1μm的β-PbO颗粒发生热分解。在加热至650°C的样品冷却后，未检测到PbO向Pb3 O4 的转变。从粒径的角度解释了观察到的现象对α-PbO2β-PbO相变温度的变化以及相的化学活性的影响。

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来源
《Journal of Thermal Analysis and Calorimetry》 |2008年第3期|857-863|共7页
作者
K. Gavrichev; A. Bolshakov; D. Kondakov; A. Khoroshilov; S. Denisov;
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作者单位

Kurnakov Institute of General and Inorganic Chemistry Leninsky prospect 31 Moscow 119991 Russia;

Kurnakov Institute of General and Inorganic Chemistry Leninsky prospect 31 Moscow 119991 Russia;

Kurnakov Institute of General and Inorganic Chemistry Leninsky prospect 31 Moscow 119991 Russia;

Kurnakov Institute of General and Inorganic Chemistry Leninsky prospect 31 Moscow 119991 Russia;

Ural Electrochemical Integrated Plant Novoural’sk Sverdlovsk region Russia;

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原文格式 PDF
正文语种 eng
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关键词
lead oxide; nanoparticles; phase transition; thermal properties;

机译：氧化铅;纳米粒子;相变;热性能;

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Thermal transformations of lead oxides

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