OPTICAL SPECTRA OF CO2+ IN THREE SYNTHETIC SILICATE MINERALS
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dc.contributor.author | Taran M.N. | |
dc.contributor.author | Rossman G.R. | |
dc.date.accessioned | 2021-03-02T07:43:49Z | |
dc.date.available | 2021-03-02T07:43:49Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=27762546 | |
dc.identifier.citation | American Mineralogist, 2001, 86, 7-8, 889-895 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/26026 | |
dc.description.abstract | Polarized optical absorption spectra of three synthetic Co-bearing silicates, orthopyroxene, olivine and beryl, were studied at room and liquid nitrogen temperatures. In all three matrices, Co enters octahedral structural sites as the Co2+ ion. In accordance with the d7 electronic energy level diagram, the spectra show three distinct band systems which are assumed to originate from three spin-allowed dd transitions of Co2+, 4T1g(4F) →4T2g(4F), 4T1g(4F) →4A2g(4F), and 4T1g(4F) →4T1g(4P). The number of bands is different in different matrices and is regulated by the splitting of electronic states, symmetry selection rules for electronic transitions between them, and Co2+ ion distribution between non-equivalent structural sites. Due to a strong preference of Co2+ for the M2 site and the greater intensities (oscillator strengths) of electronic dd transitions for Co2+ in the M2 site, M2 Co2+ bands prevail in the (Mg,Co)SiO3 orthopyroxene spectra. In olivines, the number of bands is larger than in orthopyroxene due to the combined contribution of both M1 Co2+ and M2 Co2+ ions. By comparison of the (Mg,Co)2SiO4 and Co2SiO4 olivine spectra, the bands caused by M1 Co2+ and M2 Co2+ were distinguished. The spectra of Co-bearing beryls, Be3Al2[Si6O18], prepared by both flux and hydrothermal growth, indicate that Co enters the structure mostly as Co2+ in the octahedral Alsite. | |
dc.title | OPTICAL SPECTRA OF CO2+ IN THREE SYNTHETIC SILICATE MINERALS | |
dc.type | Статья |
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