The devitrification behavior of strontium germanate glasses; examined by differential thermal analysis, Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), is reported. The glass compositions are expressed by the general formula: xSrO(1-x)GeO2 with x = 0.050, 0.125, 0.200 and 0.250. The glasses with x = 0.050 and 0.125 exhibit two glass transition temperatures due to a phase separation. The phases crystallizing during DTA runs were identified and devitrification mechanisms proposed. In all glasses SrGe4O9 crystals grow from bulk nuclei. The effect on devitrification processes of the specific surface area of the samples was also pointed out.
NON-ISOTHERMAL DEVITRIFICATION OF STRONTIUM GERMANATE GLASSES
CATAURO, Michelina;
1999
Abstract
The devitrification behavior of strontium germanate glasses; examined by differential thermal analysis, Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), is reported. The glass compositions are expressed by the general formula: xSrO(1-x)GeO2 with x = 0.050, 0.125, 0.200 and 0.250. The glasses with x = 0.050 and 0.125 exhibit two glass transition temperatures due to a phase separation. The phases crystallizing during DTA runs were identified and devitrification mechanisms proposed. In all glasses SrGe4O9 crystals grow from bulk nuclei. The effect on devitrification processes of the specific surface area of the samples was also pointed out.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
