The Study of Cerium Tetrafluoride Vaporization by Knudsen Effusion Mass Spectrometry

Chilingarov, N. S.; Shlyapnikov, Igor M.; Mazej, Zoran; Moiseev, Alexander E.; Shlyapnikov, Yuri M.; Ishtubaev, I. V.

doi:10.1149/04601.0191ecst

Cited by 2 publications

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References 4 publications

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“…Determined values of p °(CeF 4 ) and Δ s H ° (CeF 4 ) are in good agreement with recently published data and dramatically contradict those previously reported. , The first value of enthalpy of sublimation, depicted in Table , was obtained as average of eight values, calculated by the second law of thermodynamics . Experimental data were collected at temperatures of 886–1054 K. Such high temperatures could lead to solid-state fluorination of platinum effusion cell with formation of PtF 4 and PtF 2 in gaseous phase.…”

Section: Resultssupporting

confidence: 81%

“…Determined values of p°(CeF 4 ) and Δ s H°(CeF 4 ) are in good agreement with recently published data 15 and dramatically contradict those previously reported. 6,7 The first value of enthalpy of sublimation, depicted in Table 1, was obtained as average of eight values, calculated by the second law of thermodynamics.…”

Section: Articlesupporting

confidence: 85%

“…In our recent investigation of cerium tetrafluoride evaporation from the platinum effusion cell by Knudsen effusion mass spectrometry (KEMS), saturated vapor pressure and enthalpy of sublimation of CeF 4 were calculated: p °(CeF 4 ) = 0.39 Pa (873 K); Δ s H ° (CeF 4 ) = 252 ± 5 kJ/mol (845 K) . Saturated vapor pressure of CeF 4 has been determined for the first time, while values of enthalpies of sublimation, which could be found in literature, are not in agreement with each other (Table ).…”

Section: Introductionmentioning

confidence: 97%

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Cerium Tetrafluoride: Sublimation, Thermolysis, and Atomic Fluorine Migration

et al. 2015

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Saturated vapor pressure p° and enthalpy of sublimation (ΔsH°) 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.