Light scattering spectra of fast relaxation in B2O3 glass

Light scattering spectra of B2O3 glass were measured in the frequency range 20-7000 GHz at temperatures in the range of 15-300 K and are compared with those previously obtained for Ca0.4K0.6(NO3)(1.4) (CKN). The low-frequency contribution of the fast relaxation susceptibility spectrum is found to sh ow a power-law behavior with an exponent alpha=0.6, the latter being temper ature independent in contrast to the finding in other inorganic glasses suc h as silica and CKN. Possible explanations of the spectral shape in B2O3 ar e considered. (C) 2000 American Institute of Physics. [S0021-9606(00)50404- 8].