Abstract

For the dissociation of oxides, also referred to as “half reactions” the chemical potential will be defined. In analogy to the electrochemical voltage series these chemical potentials may be arranged in an “oxygen pressure series” which immediately enables one to determine the change in free energy in case of reactions with oxygen transfer. Thus the thermodynamic tendency for these reactions to proceed will be fixed in a quantitative manner. The dependence on temperature and pressure of the chemical potentials will be mentioned. Some applications as for example the behaviour of quartz or carbonized quartz in the synthesis of semiconductors will be discussed.

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