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Memorias de investigación
Artículos en revistas:
Perturbed angular correlation study of Ta-181-doped PbTi1-xHfxO3 compounds
Año:2012
Áreas de investigación
  • Física química y matemáticas,
  • Ingenierías
Datos
Descripción
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.
Internacional
Si
JCR del ISI
Si
Título de la revista
PHYSICA B-CONDENSED MATTER
ISSN
0921-4526
Factor de impacto JCR
1,063
Información de impacto
Volumen
407
DOI
10.1016/j.physb.2012.04.005
Número de revista
13
Desde la página
2610
Hasta la página
2616
Mes
SIN MES
Ranking
48/69 PHYSICS, CONDENSED MATTER Q3
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Jose de Frutos Vaquerizo (UPM)
  • Autor: Miguel Ángel De La Rubia López (UPM)
  • Autor: ROBERTO EMILIO ALONSO (UNLP-CONICET ARGENTINA)
  • Autor: Alberto R. López García (UNLP-CONICET Argentina)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Propiedades ópticas, eléctricas y magnéticas de materiales y sus aplicaciones (POEMMA)
  • Centro o Instituto I+D+i: Centro de Materiales y Dispositivos Avanzados para Tecnologías de Información y Comunicaciones
  • Departamento: Física Aplicada a las Tecnologías de la Información
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