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Bandgap behavior and singularity of the domain-induced light scattering through the pressure-induced ferroelectric transition in relaxor ferroelectric A(x)Ba(1-x)Nb(2)O(6) (A: Sr,Ca)

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Bandgap behavior and singularity of the domain-induced light scattering through the pressure-induced ferroelectric transition in relaxor ferroelectric A(x)Ba(1-x)Nb(2)O(6) (A: Sr,Ca)

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dc.contributor.author Ruiz-Fuertes, J. es_ES
dc.contributor.author Gomis, O. es_ES
dc.contributor.author SEGURA, A. es_ES
dc.contributor.author Bettinelli, M. es_ES
dc.contributor.author Burianek, M. es_ES
dc.contributor.author Muehlberg, M. es_ES
dc.date.accessioned 2020-04-29T07:05:42Z
dc.date.available 2020-04-29T07:05:42Z
dc.date.issued 2018-01 es_ES
dc.identifier.issn 0003-6951 es_ES
dc.identifier.uri http://hdl.handle.net/10251/141978
dc.description.abstract [EN] In this letter, we have investigated the electronic structure of A(x)Ba(1-x)Nb(2)O(6) relaxor ferroelectrics on the basis of optical absorption spectroscopy in unpoled single crystals with A = Sr and Ca under high pressure. The direct character of the fundamental transition could be established by fitting Urbach's rule to the photon energy dependence of the absorption edge yielding bandgaps of 3.44(1) eV and 3.57(1) eV for A = Sr and Ca, respectively. The light scattering by ferroelectric domains in the pre-edge spectral range has been studied as a function of composition and pressure. After confirming with x-ray diffraction the occurrence of the previously observed ferroelectric to paraelelectric phase transition at 4 GPa, the light scattering produced by micro-and nano-ferroelectric domains at 3.3 eV in Ca0.28Ba0.72Nb2O6 has been probed. The direct bandgap remains virtually constant under compression with a drop of only 0.01 eV around the phase transition. Interestingly, we have also found that light scattering by the polar nanoregions in the paraelectric phase is comparable to the dispersion due to ferroelectric microdomains in the ferroelectric state. Finally, we have obtained that the bulk modulus of the ferroelectric phase of Ca0.28Ba0.72Nb2O6 is B-0 = 222(9) GPa. Published by AIP Publishing. es_ES
dc.description.sponsorship J.R.-F. acknowledges the Spanish MINECO for the Juan de la Cierva (IJCI-2014-20513) Program and Dr. Bayarjargal from the Goethe-Universitat Frankfurt for providing the CBN28 samples. This work was supported by Spanish MINECO under Grant No. MAT2016-75586-C4-1-P/2-P. The high pressure x-ray diffraction experiments were performed at MSPD beamline at ALBA Synchrotron (Project 2016021588) with the collaboration of ALBA staff. es_ES
dc.language Inglés es_ES
dc.publisher American Institute of Physics es_ES
dc.relation.ispartof Applied Physics Letters es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject.classification FISICA APLICADA es_ES
dc.title Bandgap behavior and singularity of the domain-induced light scattering through the pressure-induced ferroelectric transition in relaxor ferroelectric A(x)Ba(1-x)Nb(2)O(6) (A: Sr,Ca) es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1063/1.5012111 es_ES
dc.relation.projectID info:eu-repo/grantAgreement/MINECO//IJCI-2014-20513/ES/IJCI-2014-20513/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/ALBA Synchrotron Light Source//2016021588/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/MINECO//MAT2016-75586-C4-2-P/ES/COMPUESTOS ABO3 Y A2X3 EN CONDICIONES EXTREMAS DE PRESION Y TEMPERATURA/ es_ES
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada es_ES
dc.description.bibliographicCitation Ruiz-Fuertes, J.; Gomis, O.; Segura, A.; Bettinelli, M.; Burianek, M.; Muehlberg, M. (2018). Bandgap behavior and singularity of the domain-induced light scattering through the pressure-induced ferroelectric transition in relaxor ferroelectric A(x)Ba(1-x)Nb(2)O(6) (A: Sr,Ca). Applied Physics Letters. 112(4). https://doi.org/10.1063/1.5012111 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion https://doi.org/10.1063/1.5012111 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 112 es_ES
dc.description.issue 4 es_ES
dc.relation.pasarela S\361069 es_ES
dc.contributor.funder ALBA Synchrotron Light Source es_ES
dc.contributor.funder Ministerio de Economía y Competitividad es_ES


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