Synthesis of the new compound CaFe(CO3)2 and experimental constraints on the (Ca,Fe)CO3 join

Paula M. Davidson; Gregory H. Symmes; Barbara A. Cohen; Richard J. Reeder; Donald H. Lindsley

doi:10.1016/0016-7037(93)90612-Z

Synthesis of the new compound CaFe(CO₃)₂ and experimental constraints on the (Ca,Fe)CO₃ join

Paula M. Davidson
, Gregory H. Symmes
, Barbara A. Cohen
, Richard J. Reeder
, Donald H. Lindsley

VP for Brookhaven Affairs

Stony Brook University

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

Synthesis of the new (disordered) compound CaFe(CO₃)₂ has been achieved with the use of Fe-substituted CaCO₃(Cc ss) + Ca-substituted FeCO₃(Sid ss) as starting materials, and high CO₂ pressures. High pressure (20-30 kbar) is needed to stabilize FeCO₃ to sufficiently high temperatures for disordered CaFe(CO₃)₂ to form. Experiments provide reversed compositions of coexisting disordered phases in the CaFe 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(CO₃)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(CO₃)₂ vs. that estimated for ordered CaFe(CO₃)₂ suggests that increasing pressure stabilizes the disordered phase.

Original language	English
Pages (from-to)	5105-5109
Number of pages	5
Journal	Geochimica et Cosmochimica Acta
Volume	57
Issue number	23-24
DOIs	https://doi.org/10.1016/0016-7037(93)90612-Z
State	Published - Dec 1993

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@article{035945b077ec4815a43d9277c3431e47,

title = "Synthesis of the new compound CaFe(CO3)2 and experimental constraints on the (Ca,Fe)CO3 join",

abstract = "Synthesis of the new (disordered) compound CaFe(CO3)2 has been achieved with the use of Fe-substituted CaCO3(Cc ss) + Ca-substituted FeCO3(Sid ss) as starting materials, and high CO2 pressures. High pressure (20-30 kbar) is needed to stabilize FeCO3 to sufficiently high temperatures for disordered CaFe(CO3)2 to form. Experiments provide reversed compositions of coexisting disordered phases in the CaFe 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(CO3)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(CO3)2 vs. that estimated for ordered CaFe(CO3)2 suggests that increasing pressure stabilizes the disordered phase.",

author = "Davidson, \{Paula M.\} and Symmes, \{Gregory H.\} and Cohen, \{Barbara A.\} and Reeder, \{Richard J.\} and Lindsley, \{Donald H.\}",

year = "1993",

month = dec,

doi = "10.1016/0016-7037(93)90612-Z",

language = "English",

volume = "57",

pages = "5105--5109",

journal = "Geochimica et Cosmochimica Acta",

issn = "0016-7037",

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}

TY - JOUR

T1 - Synthesis of the new compound CaFe(CO3)2 and experimental constraints on the (Ca,Fe)CO3 join

AU - Davidson, Paula M.

AU - Symmes, Gregory H.

AU - Cohen, Barbara A.

AU - Reeder, Richard J.

AU - Lindsley, Donald H.

PY - 1993/12

Y1 - 1993/12

N2 - Synthesis of the new (disordered) compound CaFe(CO3)2 has been achieved with the use of Fe-substituted CaCO3(Cc ss) + Ca-substituted FeCO3(Sid ss) as starting materials, and high CO2 pressures. High pressure (20-30 kbar) is needed to stabilize FeCO3 to sufficiently high temperatures for disordered CaFe(CO3)2 to form. Experiments provide reversed compositions of coexisting disordered phases in the CaFe 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(CO3)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(CO3)2 vs. that estimated for ordered CaFe(CO3)2 suggests that increasing pressure stabilizes the disordered phase.

AB - Synthesis of the new (disordered) compound CaFe(CO3)2 has been achieved with the use of Fe-substituted CaCO3(Cc ss) + Ca-substituted FeCO3(Sid ss) as starting materials, and high CO2 pressures. High pressure (20-30 kbar) is needed to stabilize FeCO3 to sufficiently high temperatures for disordered CaFe(CO3)2 to form. Experiments provide reversed compositions of coexisting disordered phases in the CaFe 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(CO3)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(CO3)2 vs. that estimated for ordered CaFe(CO3)2 suggests that increasing pressure stabilizes the disordered phase.

UR - https://www.scopus.com/pages/publications/0027868808

U2 - 10.1016/0016-7037(93)90612-Z

DO - 10.1016/0016-7037(93)90612-Z

M3 - Article

AN - SCOPUS:0027868808

SN - 0016-7037

VL - 57

SP - 5105

EP - 5109

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

IS - 23-24

ER -

Synthesis of the new compound CaFe(CO₃)₂ and experimental constraints on the (Ca,Fe)CO₃ join

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