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Ferroelectricity in SrTiO3 Ceramics Induced by Pr Doping

Published online by Cambridge University Press:  01 February 2011

A. Durán ,
E. Martínez ,
J. Mata ,
J. Heiras ,
X. Solans  and
J. Siqueiros
A. Durán
Affiliation:
Centro de Ciencias de la Materia Condensada, Universidad Nacional Autónoma de México, Apdo. Postal 2681, Ensenada Baja California, 22800, MÉXICO.
E. Martínez
Affiliation:
Centro de Ciencias de la Materia Condensada, Universidad Nacional Autónoma de México, Apdo. Postal 2681, Ensenada Baja California, 22800, MÉXICO.
J. Mata
Affiliation:
Centro de Ciencias de la Materia Condensada, Universidad Nacional Autónoma de México, Apdo. Postal 2681, Ensenada Baja California, 22800, MÉXICO.
J. Heiras
Affiliation:
Centro de Ciencias de la Materia Condensada, Universidad Nacional Autónoma de México, Apdo. Postal 2681, Ensenada Baja California, 22800, MÉXICO.
X. Solans
Affiliation:
Departament de cristallografia, Universitat de Barcelona-E08028, Barcelona Spain.
J. Siqueiros
Affiliation:
Departament de cristallografia, Universitat de Barcelona-E08028, Barcelona Spain.
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Abstract

Ferroelectricity was induced in SrTiO3 by the Sr exchange for Pr ion in the A site of the perovskite ABO3-type structure. X-ray diffraction patterns show single phase crystalline structure in the SrxPr1-xTiO3 compound for x=0, 0.025, 0.050, 0.075 and 0.1 compositions. Rietveld refinement shows that the unit cell volume decreases with the increasing of Pr content as a consequence of the difference between Sr/Pr ionic radii. Furthermore, high-temperature differential thermoanalysis (DTA) displays a small anomaly at about 118 °C which is probably due to the Pr ion producing a distortion of the perovskite structure via an off-center site. This deformation in the lattice induces a measurable polar behavior of the solid solution. Dielectric permittivity (ε vs T) measurements display a well defined peak at about 238 °C. Furthermore, a well defined hysteresis loop at 30 °C with a remnant polarization that tends to decrease with increasing Pr concentration is observed. Both experimental results confirm the ferroelectric state induced by the Pr ion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF9.19
Copyright
Copyright © Materials Research Society 2005

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References

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