Pressure‐Induced Polyamorphism and Formation of ‘Aragonitic’ Amorphous Calcium Carbonate
Identifieur interne : 004988 ( Main/Exploration ); précédent : 004987; suivant : 004989Pressure‐Induced Polyamorphism and Formation of ‘Aragonitic’ Amorphous Calcium Carbonate
Auteurs : Alejandro Fernandez-Martinez [France, États-Unis] ; Bora Kalkan [États-Unis] ; Simon M. Clark [États-Unis, Australie] ; Glenn A. Waychunas [États-Unis]Source :
- Angewandte Chemie [ 0044-8249 ] ; 2013-08-05.
English descriptors
- KwdEn :
- Ambient, Ambient pressure, Angew, Angewandte zuschriften, Aragonite, Basic energy sciences, Bulk modulus, Calcite, Calcium carbonate, Carbonate, Chem, Crystalline phases, Crystalline polymorphs, Cyclotron road, Decompression, Different distances, Good agreement, Good example, High pressures, Higher wavenumbers, Lawrence berkeley, Light source, Local order, Lower molar volume, Main diffraction peak, Molar, Molar volume, Molar volume data, Phys, Polyamorphism, Raman data, Theoretical value, Verlag gmbh, Weinheim angew.
- Teeft :
- Ambient, Ambient pressure, Angew, Angewandte zuschriften, Aragonite, Basic energy sciences, Bulk modulus, Calcite, Calcium carbonate, Carbonate, Chem, Crystalline phases, Crystalline polymorphs, Cyclotron road, Decompression, Different distances, Good agreement, Good example, High pressures, Higher wavenumbers, Lawrence berkeley, Light source, Local order, Lower molar volume, Main diffraction peak, Molar, Molar volume, Molar volume data, Phys, Polyamorphism, Raman data, Theoretical value, Verlag gmbh, Weinheim angew.
Abstract
Bei 10 GPa Druck geht amorphes Calciumcarbonat (ACC) einen reversiblen Amorph‐amorph‐Phasenübergang zu einer Aragonit‐ähnlichen lokalen Ordnung ein. Dieses Ergebnis spricht für einen Mechanismus, bei dem Mg2+ – ein deutlich kleineres Kation als Ca2+ – die lokale Ordnung in ACC modifiziert, indem es eine Verringerung des molaren Volumens der amorphen Phase gestattet.
Url:
DOI: 10.1002/ange.201302974
Affiliations:
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Le document en format XML
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<front><div type="abstract">Bei 10 GPa Druck geht amorphes Calciumcarbonat (ACC) einen reversiblen Amorph‐amorph‐Phasenübergang zu einer Aragonit‐ähnlichen lokalen Ordnung ein. Dieses Ergebnis spricht für einen Mechanismus, bei dem Mg2+ – ein deutlich kleineres Kation als Ca2+ – die lokale Ordnung in ACC modifiziert, indem es eine Verringerung des molaren Volumens der amorphen Phase gestattet.</div>
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