The ionic state and the coordination geometry of Fe ions in the vitreous and the devitrified states of (Na//2O. 2SiO//2)//1// minus //x(Fe//2O//3)//x glasses with 0. 05 less than x less than 0. 30, have been investigated by means of wet chemical analysis, x-ray photoelectron spectroscopy, infrared absorption, Fe core energy shift, extended x-ray absorption fine structure, and Mossbauer effect spectroscopy. Aside from preparing raw glasses with various Fe//2O//3 contents, the object of the devitrification was to precipitate iron-free crystals so as to increase the iron content in the untransformed glass matrix. In all the specimens studied the majority of Fe ions ( greater than 95%) were found to exist in the ferric state.
|Number of pages||9|
|Journal||Physics and Chemistry of Glasses|
|State||Published - 1 Feb 1987|