Abstract
Summary It could be shown that water vapor is the active component for the change of the properties of CaF 2 after a thermal treatment at higher temperatures. The reaction consists in the diffusion of anion vacancies or oxygen ions. Hydroxylions are only present in the beginning of the reaction. When an equilibrium concentration of anion vacancies is formed, the reaction proceeds further by coagulation of colloidal CaO particles. These specks precipitate principally along dislocation lines.
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