Synthesis of the new compound CaFe(CO 3 ) 2 and experimental constraints on the (Ca,Fe)CO 3 join

Details Synthesis of the new compound CaFe(CO 3 ) 2 and experimental constraints on the (Ca,Fe)CO 3 join Synthesis of the new compound CaFe(CO 3 ) 2 and experimental constraints on the (Ca,Fe)CO 3 join

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.5105d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 23-24, pp.5105-5109

Computer Science

2

Scientific paper

Synthesis of the new (disordered) compound CaFe(CO 3 ) 2 has been achieved with the use of Fe-substituted CaCO 3 (Cc ss) + Ca-substituted FeCO 3 (Sid ss) as starting materials, and high CO 2 pressures. High pressure (20-30 kbar) is needed to stabilize FeCO 3 to sufficiently high temperatures for disordered CaFe(CO 3 ) 2 to form. Experiments provide reversed compositions of coexisting disordered phases in the Ca---Fe join and locate the solvus temperature for CaFe(C) 3 ) 2 between 815 and 845°C at 30 kbars. Calculated phase relations predict that the stability of ordered CaFe(CO 3 ) 2 is limited to T < ~450°C by the breakdown to Cc ss + Sid ss. A comparison of the unit-cell volume measured for disordered CaFe(CO 3 ) 2 vs. that estimated for ordered CaFe(CO 3 ) 2 suggests that increasing pressure stabilizes the disordered phase.

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