From "Loose" to "Dense" Crystalline Phases of Calcium Carbonate through "Repulsive" Interactions: An Experimental Charge-Density Study

Anion–anion interactions in an eggshell: Experimental electron density analysis for two polymorphs of calcium carbonate revealed why the less stable form, aragonite, has higher density than the most stable form, calcite. Although believed to be exclusively repulsive, the interactions between anions...

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Bibliographic Details
Published in:Chemistry : a European journal 2012-10, Vol.18 (40), p.12633-12636
Main Authors: Nelyubina, Yulia V., Lyssenko, Konstantin A.
Format: Article
Language:English
Subjects:
Animals
anion-anion interactions
Anions - chemistry
Aragonite
Calcite
calcium
Calcium carbonate
Calcium Carbonate - chemistry
carbonates
Chemistry
Crystal structure
Crystallography, X-Ray
Crystals
Density
Egg Shell - chemistry
Egg Shell - metabolism
Electron density
electron density distribution function
Phases
Quantum Theory
X-ray diffraction
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Summary:Anion–anion interactions in an eggshell: Experimental electron density analysis for two polymorphs of calcium carbonate revealed why the less stable form, aragonite, has higher density than the most stable form, calcite. Although believed to be exclusively repulsive, the interactions between anions cause them to bind more tightly in a crystal and thus make the aragonite phase denser than its calcite counterpart (see figure).
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201201457