Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Perturbed angular correlation study of Ta-181-doped PbTi1-xHfxO3 compounds
Year:2012
Research Areas
  • Physics chemical and mathematical,
  • Engineering
Information
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.
International
Si
JCR
Si
Title
PHYSICA B-CONDENSED MATTER
ISBN
0921-4526
Impact factor JCR
1,063
Impact info
Volume
407
10.1016/j.physb.2012.04.005
Journal number
13
From page
2610
To page
2616
Month
SIN MES
Ranking
48/69 PHYSICS, CONDENSED MATTER Q3
Participants
  • 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)
Research Group, Departaments and Institutes related
  • 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
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)