Journal article
Thermodynamic aspects of the vaterite-calcite phase transition
Journal of Thermal Analysis and Calorimetry, Vol.60(2), pp.463-472
2000
Abstract
Although vaterite is the least stable anhydrous calcium carbonate polymorph, it is formed as a metastable phase in some normal and pathological biomineralisation processes. In this work, thermodynamic aspects of the vaterite-calcite phase transition were comprehensively studied. Vaterite samples were prepared by different methods and characterised for the composition, crystal structure, specific surface and grain size. All products were identified to be pure vaterite by careful X-ray diffraction measurements. The enthalpy and Gibbs energy of transition were determined by precise calorimetric and potentiometric measurements. The reliability of the thermodynamic data for the vaterite-calcite phase transition derived from this work was shown by the use of different calorimetric methods to determine the enthalpy of transition and the independent measurements of heat capacity and entropy of vaterite. Our recommended values are ΔtrsG* = -2.9 ± 0.2 kJ mol-1, ΔtrsH* = -3.4 ± 0.2 kJ mol-1 and ΔtrsS* = -1.7 ± 0.9 J K-1 mol-1, where the uncertainties are given as twice the standard deviations.
Details
- Title
- Thermodynamic aspects of the vaterite-calcite phase transition
- Authors/Creators
- G. Wolf (Author/Creator)E. Königsberger (Author/Creator)H. G. Schmidt (Author/Creator)L.C. Königsberger (Author/Creator)H. Gamsjäger (Author/Creator)
- Publication Details
- Journal of Thermal Analysis and Calorimetry, Vol.60(2), pp.463-472
- Publisher
- Akademiai Kiado
- Identifiers
- 991005541985007891
- Copyright
- © 2000 Akadémiai Kiadó, Budapest
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 2 Chemistry
- 2.165 Nanofibers, Scaffolds & Fabrication
- 2.165.1082 Calcium Carbonate Crystallization
- Web Of Science research areas
- Chemistry, Analytical
- Chemistry, Physical
- Thermodynamics
- ESI research areas
- Chemistry