Trivalent and divalent chromium ions in spinels

Details Trivalent and divalent chromium ions in spinels Trivalent and divalent chromium ions in spinels

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..875s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Issue 6-7, pp.875-881

Physics

1

Scientific paper

Phase relations in the ternary system MgO-Al 2 O 3 -Cr 2 O 3 were determined at 1700 ± 15° C to delineate the stability field of spinel crystalline solutions. It was found that there is no solubility of Cr 2 O 3 in MgCr 2 O 4 spinel, and this is attributed to the high octahedral field stabilization energy for Cr 3+ ion. By heating mixtures consisting of MgO and 50-66 mole % Cr 2 O 3 in a reducing atmosphere at 1800-2000°C a new spinel-type crystalline solution was obtained having the general formula, (Mg 8- x Cr x 2+ ) IV Cr 16 3+ VI O 32 . Data are presented concerning the synthesis, structure, electronic spectra and magnetic susceptibility of these crystalline solutions.

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