Pressure dependence of color of natural uvarovite: the barochromic effect |
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| Authors: | M N Taran K Langer M Koch-Müller |
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| Institution: | (1) Institute of Geochemistry, Mineralogy and Ore Formation, National Academy of Science of Ukraine, Palladin Ave., 34, 03680 Kyiv-142, Ukraine;(2) Applied Geosciences, Technical University of Berlin, 10623 Berlin, Germany;(3) GeoForschungsZentrum, Sektion 4.1, Telegrafenberg, 14473 Potsdam, Germany |
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| Abstract: | The electronic absorption spectra of natural uvarovite containing 62 mole% of the Cr3+ 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 10Dq 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. |
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| Keywords: | High-pressure absorption spectra Chromium Garnet Color |
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