Crystal-field effects in spinel: oxidation states of iron and chromium

Details Crystal-field effects in spinel: oxidation states of iron and chromium Crystal-field effects in spinel: oxidation states of iron and chromium

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..865m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Issue 6-7, pp.865-866

Computer Science

9

Scientific paper

Experiments with a chrome-iron spinel from Lesotho (Free State), a spinel from the Philippines, and two lunar spinels have led to a system for assigning crystal-field transitions to observed absorption bands of chromium and iron. It was possible to detect and assign bands for tetrahedrally coordinated Fe 2+ , Fe 3+ and Cr 2+ ions, and for octahedrally coordinated Fe 2+ and Cr 3+ ions in the spinels. Data on the Lesotho spinel treated at 1400°C and P O 2 = 10 -11.5 atm were used to relate composition, partial pressure of oxygen, temperature, and coordination site in spinel crystals.

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