THE STRUCTURE OF LUMINESCENCE-CENTERS OF NEODYMIUM IN GLASSES AND TRANSPARENT GLASS-CERAMICS OF THE LI2O-AL2O3-SIO2 SYSTEM

The structure of luminescence centers of Nd3+ in lithium aluminosilica te glasses and glass-ceramics has been studied. A correlation was obta ined between spectroscopic parameters, the character of phase transfor mations in the course of conversion to glass-ceramics and the precipit ated phases. In crystallization of beta-eucryptite solid solutions, th e greater part of Nd3+ ions remains in a residual glassy phase. Under re-crystallization of these solid solutions into beta-spodumene solid solutions, Nd3+ ions enter the beta-spodumene structure, The conclusio n was drawn regarding the chemical properties of the second coordinati on sphere of the Nd3+ ions.