Perturbed angular correlation study of Ta-181-doped PbTi1-xHfxO3 compounds

Alonso, Roberto Emilio and López García, Alberto Raúl and Rubia López, Miguel Ángel de la and Frutos Vaquerizo, José de (2012). Perturbed angular correlation study of Ta-181-doped PbTi1-xHfxO3 compounds. "Physica B: Condensed Matter", v. 407 (n. 13); pp. 2610-2616. ISSN 0921-4526. https://doi.org/10.1016/j.physb.2012.04.005.

Description

Title: Perturbed angular correlation study of Ta-181-doped PbTi1-xHfxO3 compounds
Author/s:
  • Alonso, Roberto Emilio
  • López García, Alberto Raúl
  • Rubia López, Miguel Ángel de la
  • Frutos Vaquerizo, José de
Item Type: Article
Título de Revista/Publicación: Physica B: Condensed Matter
Date: July 2012
ISSN: 0921-4526
Volume: 407
Subjects:
Freetext Keywords: PAC; Perovskites; Ferroelectric
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Física Aplicada a las Tecnologías de la Información [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

In this work, the hyperfine quadrupole interaction at Ta-doped PbTi1-xHfxO3 polycrystalline samples is studied for the first time. Powders with x=0.25, 0.50 and 0.75 were prepared and characterized by X-ray diffraction analysis. Perturbed Angular Correlation (PAC) analyses were done as a function of temperature, using low concentration Ta-181 nuclei as probes. In the ferroelectric and paraelectric phases of these compounds two sites were occupied by the probes. For each site the quadrupole frequency, asymmetry and relative distribution width parameters were obtained as a function of temperature above and below the Curie temperature (T-C). One of these sites was assigned to the regular Ti-Hf site, while the other one was assigned to some kind of defect. The behavior of the hyperfine parameters as a function of temperature was analyzed in terms of a recent published phase diagram and the presence of disorder below and above T-C. For the three compositions measured, the obtained hyperfine parameters present discontinuities which correspond to the ferroelectric-paraelectric phase transition. In both phases it was found broad frequency distributed interactions. The disorder in the electronic distribution would be responsible for the broad line width of the hyperfine interaction. (C) 2012 Elsevier B.V. All rights reserved.

More information

Item ID: 16538
DC Identifier: http://oa.upm.es/16538/
OAI Identifier: oai:oa.upm.es:16538
DOI: 10.1016/j.physb.2012.04.005
Official URL: http://www.sciencedirect.com/science/article/pii/S0921452612003857
Deposited by: Memoria Investigacion
Deposited on: 20 Jul 2013 10:54
Last Modified: 21 Apr 2016 16:52
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