NaPO3 Glass surface crystallization studies by the light transmittance thermal analysis

Light transmittance was measured during heating of thin NaPO3 glass plates at different heating rates. According to the results, the crystallization of orthorhombic textured NaPO3 glass proceeds from sample surfaces into their interior due to the foregoing surface nucleation. The glass surface crystallization process resulted in the sigmoidal decrease of the optical transmittance. Elaborated data lead to the activation energy of glass surface crystallization of the value of 182.8 kJ mol -1.