High-pressure optical spectroscopy and X-ray diffraction studies on synthetic cobalt aluminum silicate garnet
Research output: Contribution to journal › Journal article › Research › peer-review
The pressure-induced behavior of spin-allowed dd-bands of VIIICo2+ in the absorption spectra of synthetic Co3Al2Si3O12 garnet was studied from 10-4 to 13 GPa. The plots of the peak energy vs. pressure for the three sharpest well resolved bands at ca. 5160, 17 680, and 18 740 cm-1 display small but discernible breaks in linear relations between 4 and 5 GPa. Datafromsingle-crystalX-raydiffractionData from single-crystal X-ray diffraction likewise show discontinuities in trends of CoO8 polyhedral volume and distortion, and Co-O and Si-O bond distances over this pressure range. These effects are related to a pressure-induced phase transition from the ß- to a-isostructural polymorph of Co3Al2Si3O12.
| Original language | English |
|---|---|
| Journal | American Mineralogist |
| Volume | 92 |
| Pages (from-to) | 1616–1623 |
| ISSN | 0003-004X |
| Publication status | Published - 2007 |
- Faculty of Science - High-pressure optical spectroscopy, phase transitions, cobalt-bearing garnet, high-pressure X-ray diffraction
Research areas
ID: 1614366