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Pressure‐Induced Polyamorphism and Formation of ‘Aragonitic’ Amorphous Calcium Carbonate
Author(s) -
FernandezMartinez Alejandro,
Kalkan Bora,
Clark Simon M.,
Waychunas Glenn A.
Publication year - 2013
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201302974
Subject(s) - polyamorphism , aragonite , amorphous solid , amorphous calcium carbonate , calcium carbonate , order (exchange) , phase (matter) , mineralogy , chemistry , materials science , chemical physics , crystallography , organic chemistry , finance , economics
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 Mg 2+ —a cation with smaller ionic radius than Ca 2+ —modifies the local order of ACC to an aragonite‐like order by helping to decrease the molar volume of the amorphous phase.