Solid-solution thermodynamics in CaCO3-MnCO3.

C. Capobianco, A. Navrotsky

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Thermodynamic mixing data are reported for the calcite-rhodochrosite solid-solution series. Enthalpies of solution in an aqueous solvent saturated in NaCl and containing 0.745 M HCl were obtained for CaCO3-MnCO3 samples prepared at 600oC. Positive excess free energies and complex enthalpies (both endo- and exothermic deviations) imply negative excess entropies of mixing. Asymmetric enthalpy behaviour is inferred from phase-equilibrium data. This behaviour is seen in materials without the long-range Mn-Ca ordering characteristic of kutnahorite.-J.A.Z.

Original languageEnglish (US)
Pages (from-to)312-318
Number of pages7
JournalAmerican Mineralogist
Volume72
Issue number3-4
StatePublished - 1987
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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