1993
DOI: 10.1007/bf00200123
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Optical absorption spectroscopy of synthetic tourmalines

Abstract: Abstract. Tourmaline solid solutions containing Fe, Fe + Ti, Cr, Ni, Cu, Co, Mn chromophoric centers have been grown hydrothermally at 650 ~ C and 1,5 kbar on natural seeding plates close to the elbaite composition. The newly grown tourmalines were characterized by chemical analyses and optical absorption spectroscopy in the range 26316-5000 cm -x at 297 K and in the range 26 316 --9090 cm-1 at 77 K. Most characteristic of Fe / +, Fe 3 +-bearing specimens is the presence of intensive apolarized absorption band… Show more

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Cited by 52 publications
(47 citation statements)
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“…4). The strong and very-broad absorption band recorded at~21,800 cm À1 in the E\c spectra is assigned to Fe 2+ ÀTi 4+ intervalence charge transfer processes (Smith, 1978;Taran et al, 1993). The absorption band at~17,700 cm À1 may originate from Fe 2+ ÀFe 3+ intervalence charge transfer processes (Smith, 1978;Taran et al, 1993) or from electronic processes in Y Fe 3+ trimers (Mattson and Rossman, 1984).…”
Section: Optical Absorption Spectroscopymentioning
confidence: 97%
“…4). The strong and very-broad absorption band recorded at~21,800 cm À1 in the E\c spectra is assigned to Fe 2+ ÀTi 4+ intervalence charge transfer processes (Smith, 1978;Taran et al, 1993). The absorption band at~17,700 cm À1 may originate from Fe 2+ ÀFe 3+ intervalence charge transfer processes (Smith, 1978;Taran et al, 1993) or from electronic processes in Y Fe 3+ trimers (Mattson and Rossman, 1984).…”
Section: Optical Absorption Spectroscopymentioning
confidence: 97%
“…Likewise, the intensity of the 680 nm region spin-forbidden bands varies in proportion to the absolute amount of Cr in the sample. These features are suffi ciently diagnostic that they can be used to confi rm that the spectroscopic features of the Amstall tourmaline come dominantly from V. Also relevant is a spectrum of a synthetic tourmaline containing Cr 3+ that is presented by Taran et al (1993).…”
Section: Resultsmentioning
confidence: 99%
“…The thicknesses of the samples used for measurements are: VDR0, 0.629 mm; GRR768, 1.204 mm; GRR 1719, 2.076 mm; GRR 2128, 1.111 mm; GRR 2467, 2.258 mm. The spectrum of a synthetic, Cr-doped olenite originally presented by Taran et al (1993), retaken on a 0.278 mm thick sample, was provided by M.N. Taran.…”
Section: Optical Spectramentioning
confidence: 99%
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“…The obtained local structure around Cu appears to indicate typical two shell structure of Cu 2+ with four shorter and two longer ligands. This may suggest Jahn-Teller splitting of Cu 2+ in a distorted octahedral site (Taran and Lebedev, 1990;Rossman et al, 1991). Figures 6a and 6b show the experimental Cu EXAFS profile for greenish blue elbaite together with those of simulated ones for the two models in which Cu resides at either the Y-site or Z-site, respectively.…”
Section: +mentioning
confidence: 99%