Computer Science
Scientific paper
Sep 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38.1435m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 38, Issue 9, pp.1435-1445
Computer Science
7
Scientific paper
The techniques of electron paramagnetic resonance (EPR) were used to measure the concentration ratio of Eu 2+ to Eu 3+ in quenched silicate liquids as a function of their compositions. The compositional end members were CaAl 2 Si 2 O 8 and either MSiO 3 or M 2 Si0 4 , M = Mg , (Ca 0.5 , Mg 0.5 ), and Ca. All of the liquids were quenched from 1650 ± 25°C, 10 -6.9±0.6 atm of oxygen, and 10 -6.1±0.6 atm total pressure. For a particular choice of M, the ratio of Eu 2+ to Eu 3+ increased as much as a factor of 24 with increasing atomic ratio (Al + Si)/(O); for a constant value of (Al + Si)/(O), the ratio of Eu 2+ to Eu 3+ increased in the order Mg > ( Ca 0.5 , Mg 0.5 ) > Ca . In order to interpret the compositional dependence of the redox equilibrium of Eu in a systematic manner, the concept of a solvent coefficient was introduced.
Haskin Larry A.
Morris Richard V.
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