Summary
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1.
It was established by mass spectrometric analysis up to an accuracy of 1∶5000 that at temperatures up to 2050° K chromium carbide vapor only contains metal atoms. It was demonstrated that the evaporation of the carbides took place in stages — when heated the carbides richer in metal disproportionate into carbide with less metal and gaseous chromium. And it is only Cr3C2 that dissociates into the elements during evaporation.
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2.
A study was made by the Knudsen effusion method of the evaporation of Cr23C6 (1600–1800° K), Cr7C3 (1600–1900° K), and Cr3C2 (1800–2050° C). On the basis of vapor pressure measurements we calculated the heats of reaction for evaporation, and standard heats of formation of chromium carbides from elements.
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3.
It was demonstrated that the nature of the evaporation of chromium carbides was conditioned by the chemical elements forming these compounds and the crystal structure of the carbides.
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Bolgar, A.S., Fesenko, V.V. & Gordienko, S.P. A study of the evaporation and thermodynamic properties of chromium carbides. Powder Metall Met Ceram 5, 159–165 (1966). https://doi.org/10.1007/BF00775565
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DOI: https://doi.org/10.1007/BF00775565