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dc.contributor.authorYun, Younsuk
dc.contributor.authorLegut, Dominik
dc.contributor.authorOppeneer, Peter M.
dc.date.accessioned2012-08-01T06:37:52Z
dc.date.available2012-08-01T06:37:52Z
dc.date.issued2012
dc.identifier.citationJournal of nuclear materials. 2012, vol. 426, issues 1-3, p. 109-114.cs
dc.identifier.issn0022-3115
dc.identifier.urihttp://hdl.handle.net/10084/94942
dc.description.abstractWe report first-principles calculations of the phonon dispersion spectrum, thermal expansion, and heat capacity of uranium dioxide. The so-called direct method, based on the quasiharmonic approximation, is used to calculate the phonon frequencies within a density functional framework for the electronic structure. The phonon dispersions calculated at the theoretical equilibrium volume agree well with experimental dispersions. The computed phonon density of states (DOSs) compare reasonably well with measured data, as do also the calculated frequencies of the Raman and infrared active modes including the LO/TO splitting. To study the pressure dependence of the phonon frequencies we calculate phonon dispersions for several lattice constants. Our computed phonon spectra demonstrate the opening of a gap between the optical and acoustic modes induced by pressure. Taking into account the phonon contribution to the total free energy of UO2 its thermal expansion coefficient and heat capacity have been computed from first-principles. Both quantities are in good agreement with available experimental data for temperatures up to about 500 K.cs
dc.format.extent918161 bytescs
dc.format.mimetypeapplication/pdfcs
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofseriesJournal of nuclear materialscs
dc.relation.urihttp://dx.doi.org/10.1016/j.jnucmat.2012.03.017cs
dc.titlePhonon spectrum, thermal expansion and heat capacity of UO2 from first-principlescs
dc.typearticlecs
dc.identifier.locationNení ve fondu ÚKcs
dc.identifier.doi10.1016/j.jnucmat.2012.03.017
dc.rights.accessopenAccess
dc.type.versionsubmittedVersion
dc.type.statusPeer-reviewedcs
dc.description.sourceWeb of Sciencecs
dc.description.volume426cs
dc.description.issue1-3cs
dc.description.lastpage114cs
dc.description.firstpage109cs
dc.identifier.wos000305719200015


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