Temperature Dependence Of The Relaxation Compressability Of Boron Oxide Based On Visible Light Scattering Data

Using data obtained from Rayleigh scattering of visible light in B2O3, a change in the isothermal compressibility with temperature was calculated for the temperature range 180 to 600 deg C. Data for the relaxation compressibility were compared to those calculated from the degenerate excited state model. It was shown that the calculated data, for temperatures above 260 deg C, are in a good agreement with those obtained experimentally. As the temperature was reduced below 260 deg C, an increasing disagreement was noted between the calculated and the measured data. A possible reason for the disagreement is discussed.