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Phase transformation in relaxor-ferroelectric single crystal [Pb(Sc1/2Nb1/2)O3]0.58–[PbTiO3]0.42

Published online by Cambridge University Press:  12 May 2014

Shanmugam Velu Rajasekaran ,
Srungarpu Nagabhusan Achary ,
Sadequa J. Patwe ,
Ramasamy Jayavel ,
Garamilla Mangamma  and
Ashok Kumar Tyagi
Shanmugam Velu Rajasekaran
Affiliation:
Department of Physics, Govt. Arts College, Dharmapuri, India 636705
Srungarpu Nagabhusan Achary*
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Mumbai, India 400085
Sadequa J. Patwe
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Mumbai, India 400085
Ramasamy Jayavel
Affiliation:
Crystal Growth Centre, Anna University, Chennai, India 600025
Garamilla Mangamma
Affiliation:
Surface and Nanoscience division, Materials Science group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
Ashok Kumar Tyagi
Affiliation:
Surface and Nanoscience division, Materials Science group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The structure and phase transition behavior of monoclinic phase of the morphotropic phase boundary composition Pb(Sc1/2Nb1/2)O3]0.58 –[PbTiO3]0.42 (PSN–42PT) in lead scandium niobate–lead titanate (PSN–PT) system have been investigated by in situ high-temperature polarized light microscopy (PLM) and x-ray diffraction (XRD) studies. Temperature-dependent powder XRD studies of PSN–42PT indicated monoclinic structure at 25 °C and cubic structure at 400 °C. It is observed that the room temperature monoclinic structure transforms to cubic structure through an intermediate tetragonal structure. The temperature-induced domain changes at the phase transition are investigated on (001) face of unpoled PSN–42PT crystal while heating as well as cooling the crystal on hot stage of the PLM. Under crossed polar condition, the striplike polar domains observed at lower temperature vanish gradually with increasing temperature. In the vicinity of ferroelectric transition temperature, the mesosize domains that appeared in the variable temperature PLM images are in accordance with the monoclinic–tetragonal–cubic transition sequence concluded by in situ high-temperature XRD studies. The domain rotation corresponding to the structural transformation sequence is concluded for the first time in the PSN–42PT.

Keywords

A. ferroelectricB. single crystalC. phase transitionE. polarized light microscopy
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 9 , 14 May 2014 , pp. 1054 - 1061
Copyright
Copyright © Materials Research Society 2014 

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