Abstract
Phosphorus pentoxide is known to affect the reflectance and color of TiO2‐opacified porcelain enamels. It has been postulated that P2O5, impedes the anatase‐to‐rutile phase transformation. This hypothesis was tested by applying recently developed analytical procedures based on X‐ray diffraction analysis to a typical porcelain enamel cover coat system. The inversion of anatase to rutile was not significantly affected by P2O5. Instead, in the range 0.5 to 4%, as P2O5 concentration was increased in the frit, the rate of crystallization of both anatase and rutile also increased, with the rate of increase of anatase being about twice that of rutile.
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