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dc.contributor.authorAbrashev, Miroslav Vergilovpt_BR
dc.contributor.authorTodorov, Neno Dimitrovpt_BR
dc.contributor.authorGeshev, Julian Penkovpt_BR
dc.date.accessioned2014-12-05T02:17:33Zpt_BR
dc.date.issued2014pt_BR
dc.identifier.issn0021-8979pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/107858pt_BR
dc.description.abstractRaman spectra of R2O3 (R—Sc, Er, Y, Ho, Gd, Eu, and Sm) powders with C-type bixbyite crystal structure are measured. With the help of these data and ones, previously published for other oxides from the same structural family, general dependencies of the frequencies of the Raman peaks on the cubic crystal unit cell parameter are constructed. Using these dependencies and knowing the symmetry of the peaks for one of the oxides, determined from previous single-crystal measurements, it is possible to find out the symmetry of the peaks from the spectra of all compounds. It was found that the frequency of the six lowest frequency peaks scales with the square root of the mass of the rare earth showing that mainly R ions take part in these vibrations. These results agree with performed here lattice dynamical calculations. The anomalous softening of the frequency of some peaks in the spectra of Eu2O3 is discussed.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofJournal of applied physics. New York. Vol. 116, no. 10 (Sept. 2014), 103508, 7 p.pt_BR
dc.rightsOpen Accessen
dc.subjectSimetria cristalinapt_BR
dc.subjectDinamica de redept_BR
dc.subjectEspectros ramanpt_BR
dc.subjectCompostos de európiopt_BR
dc.subjectCompostos de érbiopt_BR
dc.subjectCompostos de hólmiopt_BR
dc.subjectCompostos de samáriopt_BR
dc.subjectCompostos de gadolíniopt_BR
dc.subjectCompostos de ítriopt_BR
dc.subjectCompostos de escândiopt_BR
dc.titleRaman spectra of R2O3 (R-rare earth) sesquioxides with C-type bixbyite crystal structure : a comparative studypt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000945018pt_BR
dc.type.originEstrangeiropt_BR


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