Die Umwandlung des Cristobalits

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Abstract
The α ⇋ β inversion of cristobalite has been investigated by observing optically the transformation of a sufficiently great number of single cristais of microscopic size. The derived transformationtemperature-function (Mengenkurve) is in good agreement with data from microcalorimetric measurements. Additional information is obtained from the distribution of the transformation temperatures of individual cristais. The behavior of the α ⇋ β inversion is determined by the superposition of two effects: the GAussian distribution of the temperatures, for which the free energies of a- and β-phases are equal, and the GAussian distribution of values for the hysteresis.

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