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The structure of sodium iron silicate glass - a multi-technique approach
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UNSPECIFIED (1999) The structure of sodium iron silicate glass - a multi-technique approach. In: 18th International Congress of Glass, SAN FRANCISCO, CALIFORNIA, JUL 05-10, 1998. Published in: JOURNAL OF NON-CRYSTALLINE SOLIDS, 253 pp. 192-202. ISSN 0022-3093.
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Abstract
Sodium iron silicate glasses of formula 0.3Na(2)O . xFe(2)O(3).(0.7-x)SiO2 (0.0 less than or equal to x less than or equal to 0.20) have been prepared by melt-quenching and their structures have been studied using X-ray photoelectron spectroscopy (XPS), neutron diffraction and Mossbauer spectroscopy. XPS of surfaces fractured in ultra-high vacuum showed the presence of both Fe2+ and Fe3+ in the glasses but the proportion of the smaller oxidation state is <20% for larger x. The O 1s spectrum can be fitted by bridging and non-bridging oxygen contributions but properties show that this description is inadequate and there are contributions from bridging oxygens, Si-O-Si, from non-bridging oxygens, Si-O Na+ and also directionally bonded Si-O-Fe. The neutron diffraction and Mossbauer data indicate that iron, irrespective of oxidation state, is 4-coordinated by oxygen. The Fe-O bond length decreases and the O-O bond length increases with increasing Fe2O3 content. Mossbauer spectroscopy confirms the predominance of the Fe3+ state in these glasses and indicates smaller Fe2+ concentrations than does XPS. possibly due to restructuring at the glass fracture surfaces examined in XPS, The effective Debye temperatures for Fe2+ and Fe3+ are 258 and 312 K, respectively, a consequence of the different M-O bond strengths of the two oxidation states. (C) 1999 Elsevier Science B.V. All rights reserved.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | T Technology > TP Chemical technology T Technology > TA Engineering (General). Civil engineering (General) |
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Journal or Publication Title: | JOURNAL OF NON-CRYSTALLINE SOLIDS | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
ISSN: | 0022-3093 | ||||
Official Date: | August 1999 | ||||
Dates: |
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Volume: | 253 | ||||
Number of Pages: | 11 | ||||
Page Range: | pp. 192-202 | ||||
Publication Status: | Published | ||||
Title of Event: | 18th International Congress of Glass | ||||
Location of Event: | SAN FRANCISCO, CALIFORNIA | ||||
Date(s) of Event: | JUL 05-10, 1998 |
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