Differential scanning calorimetry, x-ray diffraction and F19 nuclear magnetic resonance investigations of the crystallization of InF3-based glasses

Publisher Website
Google Scholar
Abstract
Results of differential scanning calometry (DSC),x-ray diffraction(XRD), and 19 F nuclear magnetic resonance(NMR) of InF 3 -based glasses,treated at different temperatures, ranging from glass transition temperature (T g ) to crystallization temperature (T c ), are reported. The main features of the experimental results are as follows. DSC analysis emphasizes several steps in the crystallization process. Heat treatment at temperatures above T g enhances the nucleation of the first growing phases but has little influence on the following ones. XRD results show that several crystalline phases are formed, with solid state transitions when heated above 680 K. The 19 F NMR results show that the spin–lattice relaxation, for the glass samples heat treated above 638 K, is described by two time constants. For samples treated below this temperature a single time constant T 1 was observed. Measurements of the 19 F spin–lattice relaxation time (T 1 ), as a function of temperature, made possible the identification of the mobile fluoride ions. The activation energy, for the ionic motion, in samples treated at crystallization temperature was found to be 0.18±0.01 eV .

This publication has 22 references indexed in Scilit: