FE2+-O AND MN2+-O BONDING AND FE2+- AND MN2+-VIBRATIONAL PROPERTIES IN SYNTHETIC ALMANDINE-SPESSARTINE SOLID SOLUTIONS: AN X-RAY ABSORPTION FINE STRUCTURE STUDY
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dc.contributor.author | Sani A. | |
dc.contributor.author | Quartieri S. | |
dc.contributor.author | Boscherini F. | |
dc.contributor.author | Antonioli G. | |
dc.contributor.author | Feenstra A. | |
dc.contributor.author | Geiger C.A. | |
dc.date.accessioned | 2022-04-18T05:17:19Z | |
dc.date.available | 2022-04-18T05:17:19Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14572652 | |
dc.identifier.citation | European Journal of Mineralogy, 2004, 16, 5, 801-808 | |
dc.identifier.issn | 0935-1221 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/37262 | |
dc.description.abstract | X-ray absorption fine structure (XAFS) measurements at the Fe and Mn K-edges were undertaken to investigate the Fe2+-O and Mn2+-O bonding, and Fe2+- and Mn2+-vibrational properties for a series of synthetic almandine-spessartine, (Fe,Mn)(3)Al2Si3O12, garnet solid solutions. The two end members almandine, Fe3Al2Si3O12, and spessartine, Mn3Al2Si3O12, and three solid solutions of composition Alm75Sps25, Alm50Sps50 and Alm25Sps75 were studied at different temperatures between 77 K and 423 K. The spectra show that the state of alternating bonds provides an appropriate description for the two crystallographic ally independent X-O(1) and X-O(2) bonds in the solid solution. An exchange of X-site cations in garnet is associated with measurable structural relaxation. The compositional and temperature dependence of the XAFS Debye-Waller factors for Fe2+ and Mn2+ in the plane of the X-O(1) and the X-O(2) bonds were also determined. Their values in the plane of the X-O(2) bonds are greater compared to those for X-O(1) and they do not vary greatly as a function of garnet composition. In the case of end-member spessartine, the XAFS Debye-Waller factors for Mn2+ are compared to the Debye-Waller factors measured from single-crystal X-ray diffraction. An analysis shows correlation in the atomic displacements along the shorter Mn-O(1) bond. | |
dc.subject | almandine | |
dc.subject | spessartine | |
dc.title | FE2+-O AND MN2+-O BONDING AND FE2+- AND MN2+-VIBRATIONAL PROPERTIES IN SYNTHETIC ALMANDINE-SPESSARTINE SOLID SOLUTIONS: AN X-RAY ABSORPTION FINE STRUCTURE STUDY | |
dc.type | Статья |
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