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Structural interpretation of anion exchange in divalent copper hydroxysalt minerals

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Abstract:

Minerals with the general formula Cu4(OH)6 A 2/n n ± pH2O (A = Cl, NO3 , SO4 2–) were synthesized and their behaviour following treatment with chloride, nitrate and sulfate solutions was studied by powder XRD and SEM. Two types of transformation were found: (1) an ion-exchange reaction manifested by preservation of both the precursor's morphology and structural type; (2) a dissolution-crystallization mechanism characterized by changes in the structural type and the morphology.

The results were considered by simultaneous application of the binary presentation of the structures, a bond valence approach and the ion-exchange ability. It was found that the structures of minerals with ion-exchange properties are built from similar layered structural unit of edge-shared and corner-shared Jahn-Teller square frameworks and different interstitial complexes of exchangeable ions, water molecules and cation-water groups. On the basis of their structural features the position of the investigated minerals in mineralogical classifications is also discussed.

Keywords: BINARY PRESENTATION; COPPER HYDROXYSALT MINERALS; ION-EXCHANGE; JAHN-TELLER EFFECT; POWDER XRD

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/claymin.2013.048.1.02

Publication date: March 1, 2013

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