Effect of composition and temperature on the absorption and emission spectra of molybdenum in glasses

Abstract

Using suitable melting techniques, the lower oxidation states of molybdenum have been obtained in phosphate, borate and silicate glasses, and in the last two systems without the use of reducing agents. Absorption spectra of glasses containing very low concentrations of molybdenum show that the intensities of the bands depends on concentration so that extinction coefficients cannot be reported. The Mo (III) absorption bands in the borate glasses are at higher energies than in the phosphate but are not so readily analysed on the basis of ligand field theory. Both absorption and emission spectra in the phosphate glass have been measured at liquid helium temperatures and the results of some initial work on the ESR spectra are also reported.