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Among others, examples may be given and discussed of passive and active (with transport of gaseous products) oxidation: active oxidation of silicon is an outstanding example. As well, it is interesting to show the active oxidation of certain refractory metals like tungsten and molybdenum which have very low vapour pressure up to very high temperature in neutral conditions (vacuum) but are unstable due to reactive vaporization under oxidizing atmospheres even at low temperature (it is interesting to relate with thermodynamic volatility diagrams described earlier). The interaction of certain ceramic oxides with water vapour at high temperature is noteworthy. Indeed the interaction of high temperature water vapour with oxides to form volatile hydroxides leads to material loss which can be a life-limiting degradation mechanism. All these reactions may be predicted and modeled using thermochemical data for reactants and products (as dealt with in the preceding thermodynamic topics) and a free energy minimization computer code. This topic is related to subsequent topics dealing with deposition processes, pyrometallurgical processes and halide lamp chemistry.

C.B. Alcock “Thermochemical processes: Principles and Models” Elsevier Science&Technology Books (Publisher: Butterworth-Heinemann), 2001, chap.8 A.S. Khanna, “Introduction to high temperature oxidation and corrosion”, ASM Intl., 2002 N . B i r k s , F . S . P e t t i t , G . H . M e i e r , " I n t r o d u c t i o n t o H i g h T e m p e r a t u r e O x i d a t i o n o f M e t a l s , Cambridge University Press, Cambridge, 2006, pp. 272.

V. Per Kofstad, "High Temperature Corrosion", Elsevier Applied Science, London/New York,


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