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Decarbonation curves and associated thermodynamic data for synthetic Cd-dolomites CdMg(CO3)2, CdMn(CO3)2 and CdZn(CO3)2

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Abstract

Decarbonation curve for the synthetic dolomite analogues; (Cd-dolomites) were determined for CdMg(CO3)2, CdMn(CO3)2 and CdZn(CO3)2 under CO2 pressure of up to 2.5 kbar. All the three double carbonates were completely disordered at the decomposition temperatures and hence the thermodynamic data (Standard enthalpy; ΔH f o, Standard free energy; ΔG f o) retrieved from the univariant decarbonation curve corresponds to the disordered phases. They are:

The mixing enthalpies and free energies for the formation of the disordered 1∶1 solid solution phases are:

The thermodynamic data (ΔH f o, ΔG f o and ΔH r o, ΔG r o) showed a positive correlation with the decomposition temperatures. The mixing energies of the disordered double carbonates also show a direct correlation with the cationic size differences.

Zusammenfassung

Die Kurve für den Austrieb von CO2 für synthetische Dolomitanaloge (Cd-Dolomite) wurde für CdMg(CO3)2, CdMn(CO3)2 und CdZn(CO3)2 bei einem CO2-Druck bis zu 2.5 kbar ermittelt. Alle drei Doppelkarbonate werden bei den Zersetzungstemperaturen vollständig ungeordnet und folglich entsprechen die anhand der univarianten Dekarbonationskurve gewonnenen thermodynamischen Angaben (Standardenthalpie; ΔH f o, Standard freie Energie; ΔG f o) der ungeordneten Phase. Diese lauten:

Die Mischungsenthalpien und freien Energien für die Bildung der ungeordneten 1∶1 Mischkristallphase lauten:

Die thermodynamischen Daten (ΔH f o, ΔG f o und ΔH r o, ΔG r o)) zeigen eine positive Korrelation mit den Zersetzungstemperaturen. Die Mischungsenergien der ungeordneten Doppelkarbonate zeigen auch eine direkte Korrelation mit den Unterschieden der Kationengröße.

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Authors and Affiliations

  1. Department of Geology, University of Mysore, 570 006, Mysore, India

    J. A. K. Tareen, A. R. Fazeli & B. Basavalingu

  2. Department of Chemistry, Regional College of Education (NCERT), Mysore, India

    G. T. Bhandige

Authors
  1. J. A. K. Tareen
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  2. A. R. Fazeli
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  3. B. Basavalingu
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  4. G. T. Bhandige
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Tareen, J.A.K., Fazeli, A.R., Basavalingu, B. et al. Decarbonation curves and associated thermodynamic data for synthetic Cd-dolomites CdMg(CO3)2, CdMn(CO3)2 and CdZn(CO3)2 . Journal of Thermal Analysis 44, 937–954 (1995). https://doi.org/10.1007/BF02547277

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  • DOI: https://doi.org/10.1007/BF02547277

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