Abstract
Glass and glass-ceramic samples with matrix of SiO2-PbF2 system were firstly prepared. The glass was transformed into glass-ceramics by heat treatment, and the effect of different heat treatment times in this process on the microenvironment of rare earth ions into the glass-ceramics was investigated. The proportion of Er3+ entering the glass-ceramics during heat treatment was calculated by using J-O theory combined with absorption spectroscopy using Er3+ as a probe. On the other hand, Er3+ was used as a probe to investigate and analyze the changes of the crystalline phase of the glass-ceramics by combining fluorescence spectra, absorption spectra, and XRD changes. The results show that the XRD patterns indicate that heat treatment of the precursor glass at the transition temperature produces rapid crystalline deposition of PbF2, but most of the rare earth ions are still present in the glass phase. And with the gradual increase of the heat treatment time, the rare earth ions in the glass phase gradually enter into the fluoride nanocrystals, but this process is not synchronized with the crystallization process.