Precipitation and mixing properties of the “disordered” (Mn,Ca)CO3 solid solution |
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| Authors: | Dionisis Katsikopoulos Ángeles Fernández-González Manuel Prieto |
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| Institution: | Departamento de Geología, Universidad de Oviedo, C/Jesús Arias de Velasco, s/n 33005 Oviedo, Spain |
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| Abstract: | The enthalpy of mixing of the calcite-rhodochrosite (Ca,Mn)CO3 solid solution was determined at 25 °C from calorimetric measurements of the enthalpy of precipitation of solids with different compositions. A detailed study of the broadening of powder X-ray diffraction peaks shows that most of the precipitates are compositionally homogeneous. All the experimental enthalpy of mixing (ΔHm) values are positive and fit reasonably well (R2 = 0.86) to a Guggenheim function of three terms: |
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