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Molecular-scale mechanisms of crystal growth in barite

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dc.contributor.authorPina Martínez, Carlos Manuel
dc.contributor.authorBecker, Udo
dc.contributor.authorRisthaus, Peter
dc.contributor.authorBosbach, Dirk
dc.contributor.authorPutnis, Andrew
dc.date.accessioned2023-06-20T16:49:20Z
dc.date.available2023-06-20T16:49:20Z
dc.date.issued1998
dc.description.abstractModels of crystal growth have been defined by comparing macroscopic growth kinetics with theoretical predictions for various growth mechanisms. The classic Burton–Cabrera–Frank (BCF) theory predicts that spiral growth at screw dislocations will dominate near equilibrium. Although this has often been observed, such growth is sometimes inhibited, which has been assumed to be due to the presence of impurities. At higher supersaturations, growth is commonly modelled by twodimensional nucleation on the pre-existing surface according to the ‘birth and spread’ model. In general, the morphology of a growing crystal is determined by the rate of growth of different crystallographic faces, and periodic-bond-chain (PBC) theory relates this morphology to the existence of chains of strongly bonded ions in the structure. Here we report tests of such models for the growth of barite crystals, using a combination of in situ observations of growth mechanisms at molecular resolution with the atomic force microscope and computer simulations of the surface attachment of growth units. We observe strongly anisotropic growth of two-dimensional nuclei with morphologies controlled by the underlying crystal structure, as well as structure- induced self-inhibition of spiral growth. Our results reveal the limitations of both the BCF and PBC theories in providing a general description of crystal growth.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/14550
dc.identifier.issn0028-0836
dc.identifier.officialurlhttp://www.nature.com/nature/index.html
dc.identifier.urihttps://hdl.handle.net/20.500.14352/57136
dc.journal.titleNature -London
dc.language.isoeng
dc.page.final486
dc.page.initial483
dc.publisherNature Publishing Group
dc.rights.accessRightsopen access
dc.subject.cdu548.5
dc.subject.keywordCrystal Growth
dc.subject.keywordBarite
dc.subject.ucmCristalografía (Geología)
dc.titleMolecular-scale mechanisms of crystal growth in barite
dc.typejournal article
dc.volume.number395
dspace.entity.typePublication
relation.isAuthorOfPublicationea4a455d-94c9-4139-ba99-fbc6fea3e899
relation.isAuthorOfPublication.latestForDiscoveryea4a455d-94c9-4139-ba99-fbc6fea3e899
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