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dc.contributor.author
Santana, R. C.
dc.contributor.author
Cunha, R. O.
dc.contributor.author
Santos, M. G.
dc.contributor.author
Ferreira, K. D.
dc.contributor.author
Carvalho, J. F.
dc.contributor.author
Calvo, Rafael
dc.date.available
2017-07-18T15:41:27Z
dc.date.issued
2007-12
dc.identifier.citation
Santana, R. C.; Cunha, R. O.; Santos, M. G.; Ferreira, K. D.; Carvalho, J. F.; et al.; Growth, EPR and Optical Absorption Spectra of L-Threonine Single Crystals Doped with Cu2+ Ions; Pergamon-Elsevier Science Ltd; Journal of Physics and Chemistry of Solids; 68; 4; 12-2007; 586-593
dc.identifier.issn
0022-3697
dc.identifier.uri
http://hdl.handle.net/11336/20791
dc.description.abstract
We investigated the crystal growth, electron paramagnetic resonance (EPR) and optical absorption spectra of L-threonine doped with Cu2+. The quality, size and habit of the single crystals grown from aqueous solution by the slow solvent evaporation and by the cooling method vary when the impurities are introduced during the growth process. The angular variations of the EPR spectra of single crystal samples at room temperature and 9.77 GHz with the magnetic field orientation in three crystal planes (ab, bc and ac) show the presence of copper impurities in four symmetry related interstitial sites of the unit cell. These spectra display well resolved hyperfine couplings of the S = ½ of Cu2+ with the ICu=3/2 of the copper nuclei. Additional hyperfine splittings, well resolved only for specific orientations of the magnetic field, indicate that the copper ions have two N ligands with approximately equal hyperfine couplings. The principal values of the g and ACu tensors calculated from the EPR data are g1= 2.051(1), g2 = 2.062(2), g3 = 2.260(2), A1= 16.9(5)10-4 cm-1, A2= 21.8(6)10-4 cm-1, A3= 180.0(5)10-4 cm-1. The principal directions corresponding to g3 and to A3 are coincident within the experimental error and reflect the orientation of the bonding planes of the copper ions in the crystal. The values of the crystal field parameters are evaluated from the optical absorption spectrum and the bonding parameters of the Cu impurities in the crystal are calculated and analyzed. The EPR and optical absorption results are discussed in terms of the crystal structure of L-threonine and the electronic structure of the Cu2+ ions, and compared with data reported for other systems. The effect of the impurities in the growth and habit of the crystals is discussed.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject.classification
Física de los Materiales Condensados
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Growth, EPR and Optical Absorption Spectra of L-Threonine Single Crystals Doped with Cu2+ Ions
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-07-13T18:46:34Z
dc.journal.volume
68
dc.journal.number
4
dc.journal.pagination
586-593
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Oxford
dc.description.fil
Fil: Santana, R. C.. Universidade Federal de Goiás; Brasil
dc.description.fil
Fil: Cunha, R. O.. Universidade Federal de Goiás; Brasil
dc.description.fil
Fil: Santos, M. G.. Universidade Federal de Goiás; Brasil
dc.description.fil
Fil: Ferreira, K. D.. Universidade Federal de Goiás; Brasil
dc.description.fil
Fil: Carvalho, J. F.. Universidade Federal de Goiás; Brasil
dc.description.fil
Fil: Calvo, Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
dc.journal.title
Journal of Physics and Chemistry of Solids
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jpcs.2007.01.043
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0022369707000480?via%3Dihub


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