Pressure-induced polyamorphism and formation of 'Aragonitic' Amorphous Calcium Carbonate

FERNANDEZ-MARTINEZ ; KALKAN ; WAYCHUNAS ; CLARK

Type de document
ARTICLE A COMITE DE LECTURE REPERTORIE DANS BDI (ACL)
Langue
anglais
Auteur
FERNANDEZ-MARTINEZ ; KALKAN ; WAYCHUNAS ; CLARK
Résumé / Abstract
Amorphous calcium carbonate (ACC) is a precursor to the crystalline phases of CaCO3, commonly found in the earliest stages of biomineral development and as one of the meta-stable states formed during the inorganic precipitation of calcium carbonate crystalline polymorphs. Its isotropic and hydrous moldable character allows many organisms to form very complex conformations of their shells or skeletons by taking advantage of these unique properties. At least two different phases of biogenic ACC have been described to date: a highly hydrated phase with one water molecule per CaCO3 unit, and an anhydrous phase that forms as a transient phase prior to crystallization to vaterite or calcite.
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