Accession Number : AD0773952

Title :   Raman Study of Isothermal Devitrification Kinetics of NaPO3(gl).

Descriptive Note : Technical rept.,

Corporate Author : BROWN UNIV PROVIDENCE R I DEPT OF CHEMISTRY

Personal Author(s) : Exarhos,Gregory J. ; Risen,William M. , Jr

Report Date : 30 JAN 1974

Pagination or Media Count : 28

Abstract : A laser Raman spectroscopic method has been developed by which the increase in crystallinity of a devitrifying glass can be monitored continuously and isothermally, at the devitrification temperature without sample quenching, in a molecularly specific manner to yield high quality kinetic data on the glass-crystal transformation. Applied to the study of vitreous (NaPO3)n(gl), the method has yielded continuous data which have been fit, by a non-linear least squares method, to an exponential equation. The results are analyzed in terms of current theories. (Modified author abstract)

Descriptors :   *Phosphate glass, *Raman spectra, *Phase transformations, Crystals, Phase studies, Crystallization, Heat of activation, Reaction kinetics, Amorphous materials

Subject Categories : Ceramics, Refractories and Glass
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE