The Library
MOSSBAUER-SPECTRA OF TIN IN BINARY SI-SN OXIDE GLASSES
Tools
UNSPECIFIED (1995) MOSSBAUER-SPECTRA OF TIN IN BINARY SI-SN OXIDE GLASSES. JOURNAL OF PHYSICS-CONDENSED MATTER, 7 (49). pp. 9485-9497. ISSN 0953-8984.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Abstract
The Mossbauer spectra of Sn-119 in binary glasses of SnO and SiO2, in varying proportions of between 16.8 and 71.5 mol% SnO, have been obtained at 77 K. From these spectra the tin was found to be predominantly in the 2(+) state. The isomer shift and the quadrupole splitting were both significantly greater than those in crystalline SnO and were found to decrease with increasing tin content, which also corresponds to decreasing molar volume. A second series of spectra of two of the samples was taken at temperatures between 10 and 300 K. These spectra show a decrease in shift with temperature which was the same for the two samples and which could only partly be accounted for by the second-order Doppler shift. The remainder was ascribed to the temperature dependence of the isomer shift. By using these data together with the measured expansivity and increase in density with tin content, it was possible to correct the isomer shift for the effects of the change in volume, and it was found that the volume-corrected isomer shift increased with increasing tin content. This showed that there was an increase in s-electron density at the tin nuclei, while the accompanying decrease in quadrupole splitting showed a decrease in the p-electron character, as expected for a decrease in covalency. From the decrease in absorption area with temperature the Debye temperature of tin was estimated to be similar to 190 K, which is slightly less than that of crystalline SnO, and decreased with increasing tin content. All the data suggest that the Sn-O bonds become progressively less covalent as more tin is added to SnO-SiO2 glasses, and possibly indicate a change from 4-fold to 6-fold co-ordination.
A third series of spectra was obtained for the glass containing 40.9 mol% of SnO after a series of heat treatments. The spectra show changes in the oxidation state of the tin which depended upon the different conditions applied.
Item Type: | Journal Article | ||||
---|---|---|---|---|---|
Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | JOURNAL OF PHYSICS-CONDENSED MATTER | ||||
Publisher: | IOP PUBLISHING LTD | ||||
ISSN: | 0953-8984 | ||||
Official Date: | 4 December 1995 | ||||
Dates: |
|
||||
Volume: | 7 | ||||
Number: | 49 | ||||
Number of Pages: | 13 | ||||
Page Range: | pp. 9485-9497 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |