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- D'Ippolito, VeronicaSapienza University, Rome, Italy (author)
Color mechanisms in spinel: cobalt and iron interplay for the blue color
- Article/chapterEnglish2015
Publisher, publication year, extent ...
- 2015-01-28
- Springer Science and Business Media LLC,2015
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:nrm-1228
- https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-1228URI
- https://doi.org/10.1007/s00269-015-0734-0DOI
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- Language:English
- Summary in:English
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- Six natural, blue colored spinel crystals were studied chemically by electron microprobe and laser ablation inductively coupled plasma mass spectrometry (LAICP-MS) techniques and optically by UV–VIS–NIR–MIR spectroscopy in the range 30,000–2,000 cm−1 to investigate the causes of their blue color hues. The positions of the absorption bands vary only marginally with the principal composition of the samples (gahnite vs. spinel s.s .). Although blue colors in spinels are frequently the result of various electronic processes in Fe cations, we demonstrate by comparison with synthetic Co-bearing samplesthat Co acts as an important chromophore also in natural spinels. Already at concentration levels of a few ppm (e.g.,>10 ppm), cobalt gives rise to absorption bands at ~18,000, 17,000 and 16,000 cm−1 that result in distinct blue coloration. In spinels with insignificant Co contents, different shades of paler blue (from purplish to greenish blue) colors are caused by electronic transitions in TFe2+, MFe2+, MFe3+ and Fe2+–Fe3+ cation pairs.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Geokemi hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Geochemistry hsv//eng
- The changing Earth
- Den föränderliga jorden
Added entries (persons, corporate bodies, meetings, titles ...)
- Andreozzi, GiovanniSapienza University, Rome, Italy (author)
- Hålenius, UlfNaturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)ulfhalen (author)
- Skogby, HenrikNaturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)henrskog (author)
- Hametner, KathrinETH, Zürich, Switzerland (author)
- Günther, DetlefETH, Zürich, Swizerland (author)
- Sapienza University, Rome, ItalyEnheten för geovetenskap (creator_code:org_t)
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- In:Physics and chemistry of minerals: Springer Science and Business Media LLC42:6, s. 431-4390342-17911432-2021
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