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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Cerium Tetrafluoride: Sublimation, Thermolysis, and Atomic Fluorine Migration
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Cerium Tetrafluoride: Sublimation, Thermolysis, and Atomic Fluorine Migration

机译：四氟化铈：升华，热解和原子氟迁移

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摘要

Saturated vapor pressure p degrees and enthalpy of sublimation (Delta H-s degrees) of cerium tetrafluoride CeF4 were determined by means of Knudsen effusion mass spectrometry in the range of 750-920 K. It was discovered that sublimation of cerium tetrafluoride from a platinum effusion cell competes with thermal decomposition to CeF3 in the solid phase, but no accompanying release of fluorine to the gas phase occurs. Thus, fluorine atoms migrate within the surface layer of CeF4(s) to the regions of their irreversible drain. We used scanning electron microscopy to study the distribution of the residual CeF3(s) across the inner surface of the effusion cell after complete evaporation of CeF4(s). It was observed that CeF3 accumulates near the edge of the effusion orifice and near the junction of the lid and the body of the cell, that is, in those regions where the fluorine atoms can migrate to a free platinum surface and thus be depleted from the system. Distribution of CeF3(s) solid particles indicates the ways of fluorine atoms migration providing CeF3(s) formation inside the CeF4(s) surface layer.
机译：通过Knudsen渗流质谱法在750-920 K的范围内确定了四氟化铈CeF4的饱和蒸气压p度和升华焓（Delta Hs度）。发现铂扩散池中的四氟化铈升华与竞争在固相中会热分解为CeF3，但不会伴随有氟向气相的释放。因此，氟原子在CeF4的表面层内迁移至其不可逆漏极的区域。我们使用扫描电子显微镜研究了CeF4（s）完全蒸发后，残留的CeF3（s）在积液池内表面的分布。观察到CeF3积聚在渗出孔的边缘附近和盖子与池体的接合处附近，即在那些氟原子可以迁移到自由铂表面并因此从其中耗尽的区域。系统。 CeF3（s）固体颗粒的分布指示氟原子迁移的方式，从而在CeF4（s）表面层内部形成CeF3（s）。

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