The effect of minor additions of P2O5 on some phase transformations of plate glass

The effects of additions of several tenths of a per cent of P₂O₅ on the devitrification behavior of plate glass with the primary phase of tridymite are different from that with the primary phase of wollastonite. But they still follow the phase equilibrium relationship of multicomponents. By examinations with TEM, and measurements of electrical resistivities, it is indicated that phase separation of plate glass may be promoted with a minor addition of P₂O₅. Through XPS measurements it is further suggested that such an addition causes a certain change in the structure of the plate glass.