Abstract
Abstract IR-transmission spectra of 95TeO2·5Fe2O3 glass piece show a gradual decrease in the transmittance due to the crystallization initiating at the surface and spreading to the bulk. XRD, IR absorption spectra, and 57Fe-Mössbauer spectra show the formation of paratellurite (α-TeO2) and iron tellurite in the glass matrix. Johnson–Mehl–Avrami plot yields the activation energy (Ea) of 2.9 ± 0.3 eV for the crystallization when the crystallized fraction is approximated by the decreased fraction of IR-transmittance. The Ea is identical to the Te–O single bond energy (3.0 eV) obtained from the literature. Kissinger plot of DTA used for the crystallization in the bulk yields Ea of 2.3 eV. These results indicate that the crystallization proceeds in a two- or three-dimensional manner by the diffusion process both in the bulk and at the surface. Ar+-laser irradiation of 95TeO2·5Fe2O3 glass results in a decrease in the IR-transmittance, indicating the “optical memory” effect.
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