Other
Scientific paper
Sep 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38.1447m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 38, Issue 9, pp.1447-1459
Other
5
Scientific paper
The techniques of electron paramagnetic resonance (EPR) were used to measure the concentration ratio of Eu 2+ to Eu 3+ in quenched CaMgSi 2 O 6 , Ca 3 Si 3 O 12 , and CaAl 2 Si 2 O 8 liquids as functions of partial pressure of oxygen and temperature. The redox equilibrium of the Eu ions was described by the reaction 4 Eu 3+ + 20 2- = 4 Eu 2+ + O 2 . The reduction of Eu 3+ to Eu 2+ was endothermic, and for CaMgSi 2 O 6 and Ca 3 Al 2 Si 3 O 12 liquids the mean value of H 0 and the standard deviation from that mean were 25 ± 7 kcal/mole. The magnitude of the Eu anomaly in the distribution coefficients is discussed in terms of the compositions of the solid and liquid phases.
Biggar Gordon M.
Haskin Larry A.
Morris Richard V.
O'Hara Michael James
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