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Pressure‐Induced Polyamorphism and Formation of ‘Aragonitic’ Amorphous Calcium Carbonate

Identifieur interne : 004987 ( Main/Exploration ); précédent : 004986; suivant : 004988

Pressure‐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 :

RBID : ISTEX:C67DCD7065C6CFBECD8DCCFC44719AD3A0007D51

English descriptors

Abstract

Pressed for time: Amorphous calcium carbonate (ACC) undergoes a reversible amorphous–amorphous phase transition at 10 GPa, adopting an aragonite‐like local order. This result suggests a mechanism by which Mg2+—a cation with smaller ionic radius than Ca2+—modifies the local order of ACC to an aragonite‐like order by helping to decrease the molar volume of the amorphous phase.

Url:
DOI: 10.1002/anie.201302974


Affiliations:


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Le document en format XML

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<div type="abstract">Pressed for time: Amorphous calcium carbonate (ACC) undergoes a reversible amorphous–amorphous phase transition at 10 GPa, adopting an aragonite‐like local order. This result suggests a mechanism by which Mg2+—a cation with smaller ionic radius than Ca2+—modifies the local order of ACC to an aragonite‐like order by helping to decrease the molar volume of the amorphous phase.</div>
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