High temperature structural investigation of Na2O·0.5Fe2O3·3SiO2 and Na2O·FeO·3SiO2 melts and glasses |
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| Authors: | Zifu Wang Thomas F Cooney Shiv K Sharma |
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| Institution: | (1) Hawaii Institute of Geophysics, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, 96822 Honolulu, HI, USA |
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| Abstract: | The structure of glasses and melts of Na2O· 0.5Fe2O3·3SiO2 and Na2O·FeO·3SiO2 compositions have been measured using high temperature Raman spectroscopy. For the oxidized sample it has been demonstrated that there is a close structural relationship between melt and glass. No coordination changes of Fe3+ with temperature and no new anionic species have been observed in the oxidized melt. The Raman spectra of the reduced sample clearly show a decrease in the degree of polymerization, as determined by the observation of the polarization character of the spectra and the details of the change of the Raman intensities during heating in hydrogen. Mössbauer spectra suggest that Fe3+ is tetrahedrally coordinated in the oxidized glass and part of the Fe2+ is tetrahedrally coordinated in the reduced glass. |
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