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Thermal Analysis at Low and High Temperature and Evidence of Structural Transition Induced by Praseodymium in SrTiO3

Published online by Cambridge University Press:  26 February 2011

Alejandro Durán ,
Francisco Morales ,
Luis Fuentes ,
Javier Castro  and
Jesus Siqueiros
Alejandro Durán
Affiliation:
dural@ccmc.unam.mx, Universidad Nacional Autónoma de México, Centro de Ciencias de la Materia Condesada, Km 107 Carretera Tijuana-Ensenada, Ensenada, Baja California, United States, ++52 646 174 46 02
Francisco Morales
Affiliation:
fmleal@servidor unam.mx, Universidad Nacional Autónoma de México, Instituto de Investigación en Materiales, Mexico, 04510, Mexico
Luis Fuentes
Affiliation:
luis.fuentes@cimav.edu.mx, Centro de Investigacion de Materiales Avanzados (CIMAV), Chihuahua, 13109, Mexico
Javier Castro
Affiliation:
jcastro@uacj.mx, Universidad Autónoma de Cd. Juarez, Instituto de Ingenieria y Tecnologia, Ciudad Juarez, Chiuh., 32300, Mexico
Jesus Siqueiros
Affiliation:
jesus@ccmc.unam.mx, Universidad Nacional Autónoma de México, Centro de Ciencias de la Materia Condesada, Ensenada B.C., 22800, Mexico
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Abstract

To explore the nature of ferroelectric behavior induced by Pr ion in the SrTiO3 ceramic, we brought together a combination of Synchrotron x-ray powder diffraction and thermal analysis. Rietveld analysis shows a clear peak splitting strongly suggesting a cubic-tetragonal structural transition when 15 % Pr substitutes the Sr site. To determine the temperature of the structural instability differential thermal analysis at high temperatures (30-900 °C) and specific heat at low temperatures (2-300 K) were performed. The difference in the heat capacity for Pr doped and undoped samples are very small. A plateau in Cp/T vs T at 110 K is a clear evidence of the competing effect of two kinds of order parameters, one represented by the polarization and the other by the rotation of the oxygen octahedral in the perovskite structure. Upon heating, DTA analysis shows an unexpected single endothermal broad anomaly at about 118 °C. The occurrence of this thermal anomaly could be related to displacive structural contributions providing unambiguous evidence of diffuse phase transition.

Keywords

ferroelectricityspecific heatx-ray diffraction (XRD)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 966: Symposium T – Ferroelectrics and Multiferroics , 2006 , 0966-T07-22
Copyright
Copyright © Materials Research Society 2007

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