Pressure dependence of color of natural uvarovite: the barochromic effect

The electronic absorption spectra of natural uvarovite containing 62 mole% of the Cr 3+ end-member were studied at pressures between 10 −4 and ca. 13 GPa using DAC techniques combined with microscope spectrometric device. With increasing pressure, a barochromic effect with change from green to red c...

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Bibliographic Details
Published in:Physics and chemistry of minerals 2008-04, Vol.35 (3), p.175-177
Main Authors: Taran, M. N., Langer, K., Koch-Müller, M.
Format: Article
Language:English
Subjects:
Absorption spectra
Chemical bonds
Chromium
Color
Crystallography and Scattering Methods
Data points
Earth and Environmental Science
Earth Sciences
Geochemistry
Mineral Resources
Mineralogy
Organic chemistry
Original Paper
Pressure dependence
Pressure effects
Spectrometry
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Summary:The electronic absorption spectra of natural uvarovite containing 62 mole% of the Cr 3+ end-member were studied at pressures between 10 −4 and ca. 13 GPa using DAC techniques combined with microscope spectrometric device. With increasing pressure, a barochromic effect with change from green to red color of the garnet specimen was observed. This change could be interpreted on the basis of the spectra and the data points derived in an ICE color card. The evaluation of crystal field data from the spectra showed that 10 Dq of chromium increases on pressure while the Racah parameter B , and thus the nature of the chemical bond of Cr–O does not change significantly.
ISSN:0342-1791
1432-2021
DOI:10.1007/s00269-007-0209-z