Fe2+-Ti4+ charge transfer in stoichiometric Fe2+,Ti4+-minerals |
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Authors: | Stephanie M. Mattson George R. Rossman |
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Affiliation: | 1. Department of Chemistry, Moorhead State University, 56560, Moorhead, MN, USA 2. Division of Geological & Planetary Sciences, California Institute of Technology, 91125, Pasadena, CA, USA
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Abstract: | Optical absorption spectra are presented for taramellite, traskite and neptunite, all of which have both Fe2+ and Ti4+ as major elements. The spectra of each of these minerals are dominated by a single, intense absorption band in the 415 to 460 nm region with 7000 to 9000 cm?1 halfwidth. These transitions, assigned to Fe2+-Ti4+ intervalence charge transfer, showed little difference in intensity at 80 and 300 K and have molar absorptivities which range from ~100 to ~1300 M?1 cm?1. The Fe2+-Ti4+ absorptions in these standards generally compare well to other mineral spectra in which Fe2+ — Ti4+ intervalence absorption has previously been proposed with the exception of the most cited example, blue corundum. |
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