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Published in:
2007 | OriginalPaper | Chapter
Vaporization Coefficients
Published in: Thermal Decomposition of Solids and Melts
Publisher: Springer Netherlands
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The vaporization coefficient,
α
v, is usually defined as the ratio of the actual flow of gaseous decomposition product
J
to the flow
J
max coming from an effusion cell, in which, it is assumed, decomposition products are in an ideal equilibrium with the reactant. For many substances, as found from comparative Knudsen–Langmuir TG measurements,
?
v << 1, i.e., their free-surface decomposition proceeds much more slowly than would be expected from effusion observations. It is a common practice to explain this discrepancy by a multistage character of the evaporation process, by surface relief peculiarities or by impurities and defects (imperfections) in the reactant lattice.