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
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/141978
Title:
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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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Author:
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Ruiz-Fuertes, J.
Gomis, O.
SEGURA, A.
Bettinelli, M.
Burianek, M.
Muehlberg, M.
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UPV Unit:
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Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada
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Issued date:
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Abstract:
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[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 ...[+]
[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.
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Copyrigths:
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Reserva de todos los derechos
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Source:
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Applied Physics Letters. (issn:
0003-6951
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DOI:
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10.1063/1.5012111
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Publisher:
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American Institute of Physics
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Publisher version:
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https://doi.org/10.1063/1.5012111
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Project ID:
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info:eu-repo/grantAgreement/MINECO//IJCI-2014-20513/ES/IJCI-2014-20513/
info:eu-repo/grantAgreement/ALBA Synchrotron Light Source//2016021588/
info:eu-repo/grantAgreement/MINECO//MAT2016-75586-C4-2-P/ES/COMPUESTOS ABO3 Y A2X3 EN CONDICIONES EXTREMAS DE PRESION Y TEMPERATURA/
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Thanks:
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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 ...[+]
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.
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Type:
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Artículo
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