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zeige Details Davey, R. J., Maginn, S. J., ... Stabilization of a metastable crystalline phase by twinning
in: Nature . - London [u.a.] : Nature Publising Group, ISSN 1476-4687, Vol. 366, No. 6452 (1993), p. 248-250
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1993
POLYMORPHISM of crystal structures—alternative crystalstructures resulting from variations in ionic and molecularpacking1 and conformation2—is important ina number of fields in solid-state chemistry, includingbiomineralization3 (in the mineral phases of calciumcarbonate3, for example), polymer science(polypropylene4, for example), explosives (ammonium nitrate,lead azide5), nonlinear optical materials6,ceramics and catalysis (zeolites and metal oxides7). In thepharmaceutical and fine-chemicals industries, polymorphism is central to bothproduction process design and product activity8. Here we showthat crystal twinning can stabilize a crystal polymorph that is otherwise notthe most stable form. We use electron microscopy, X-ray diffraction and Ramanspectroscopy to show that the apparently indefinite persistence of a metastablepolymorph of terephthalic acid can be explained on this basis. If twinning canbe engineered, it may therefore provide a means for stabilizing crystal phaseswith useful physical properties.
beteiligte Personen: Davey, R. J. , Maginn, S. J. , Andrews, S. J. , Buckley, A. M. , Cottier, D. , Dempsay, P. , Rout, J. E. , Stanley, D. R. , Taylor, A.
Format: Elektronisch
Erschienen: 1993.
Serie: Nature Archives 1869 - 2007 [Dig. Serial]
Schlagwörter:
URL: http://dx.doi.org/10.1038/366248a0

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