| Reference Type | Journal (article/letter/editorial) |
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| Title | Dynamic biaxial absorption spectra of Ti3+ and Fe2+ in a natural rose quartz crystal |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Cohen, A. J. | Author |
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| Makar, L. N. | Author |
| Year | 1985 (December) | Volume | 49 |
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| Issue | 354 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_49/49-354-709.pdf+ |
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| DOI | doi:10.1180/minmag.1985.049.354.10Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3790 | Long-form Identifier | mindat:1:5:3790:1 |
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| GUID | 0 |
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| Full Reference | Cohen, A. J., Makar, L. N. (1985) Dynamic biaxial absorption spectra of Ti3+ and Fe2+ in a natural rose quartz crystal. Mineralogical Magazine, 49 (354) 709-715 doi:10.1180/minmag.1985.049.354.10 |
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| Plain Text | Cohen, A. J., Makar, L. N. (1985) Dynamic biaxial absorption spectra of Ti3+ and Fe2+ in a natural rose quartz crystal. Mineralogical Magazine, 49 (354) 709-715 doi:10.1180/minmag.1985.049.354.10 |
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| In | (1985, December) Mineralogical Magazine Vol. 49 (354) Mineralogical Society |
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| Abstract/Notes | AbstractThe absorption spectrum of Ti3+ in quartz is typical for that element in an octahedral site, except for the high oscillator strength of the band which indicates intensive charge transfer, most likely between a substitutional Ti4+ and an interstitial Ti3+. The biaxial anisotropy of the band is similar to that of octahedral Fe2+ in the same crystal, suggesting the same site for the Ti3+, an interstitial site at the intersection of the threefold axis with two twofold axes. The dynamic nature of the Ti and Fe ions is indicated when the crystal is subjected to X-irradiation and then to bleaching treatment with UV-light or heat. Ti(IV) ions are acceptors of electrons donated by Fe2+ during X-irradiation. This is indicated by increase of the 2.4 eV band intensity with decrease in the Fe2+ band intensities and appearance of Fe3+ charge transfer bands in the UV-region. Heat and UV-light treatment decrease the Fe3+ CT bands and increase the Fe2+ crystal-field bands along with decrease in the 2.4 eV band related to titanium. |
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