Standard free energy change of formation per unit volume: a new parameter for evaluating nucleation and growth of oxides, sulphides, carbides and nitrides |
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| Authors: | Yedong He Zhengwei Li Huibin Qi W Gao |
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| Affiliation: | (1) Corrosion and Protection Centre, University of Science and Technology Beijing, Beijing (100083), P.R. China, CN;(2) Department of Chemical and Materials Engineering, The University of Auckland, Private Bag 92019, Auckland New Zealand, Fax 64 93737463, E-mail w.gao@auckland.ac.nz, NZ |
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| Abstract: | The present paper introduces a thermodynamic parameter, the standard free energy changes of formation of oxide, sulphide,
carbide and nitride per unit volume, as a criterion for comparing the formation tendency of these compounds. The diagrams
for the standard free energy change of formation of common oxides, sulphides, carbides and nitrides per unit volume vs temperature have been calculated and established based on the available thermodynamic data. It is believed that these diagrams
can provide better explanations to some oxidation phenomena including the effects of reactive elements on the selective oxidation
of Cr2O3 and Al2O3.
Received: 12 September 1997 / Accepted: 16 September 1997 |
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| Keywords: | Standard free energy Unit volume Selective oxidation Metal oxide Metal sulphide Metal carbide Metal nitride |
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