Nanotwin and phase transformation in tetragonal Pb(Fe1/2Nb1/2)1−xTixO3 single crystal

Nanotwin and phase transformation in tetragonal Pb(Fe1/2Nb1/2)1−xTixO3 single crystal

This work is a study of phase transformation in (001)-cut Pb(Fe1/2Nb1/2)1−xTixO3 (x=48%) single crystals by means of dielectric permittivity, domain structure, and in situ x-ray diffraction. A first-order T(TNT)-C(TNT) phase transition was observed at the Curie temperature TC≅518 K upon zero-field h...

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Veröffentlicht in:Journal of applied physics 2008-09, Vol.104 (5)
Hauptverfasser: Tu, C.-S., Tseng, C.-T., Chien, R. R., Schmidt, V. Hugo, Hsieh, C.-M.
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container_issue 5
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container_title Journal of applied physics
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creator Tu, C.-S.
Tseng, C.-T.
Chien, R. R.
Schmidt, V. Hugo
Hsieh, C.-M.
description This work is a study of phase transformation in (001)-cut Pb(Fe1/2Nb1/2)1−xTixO3 (x=48%) single crystals by means of dielectric permittivity, domain structure, and in situ x-ray diffraction. A first-order T(TNT)-C(TNT) phase transition was observed at the Curie temperature TC≅518 K upon zero-field heating. T, TNT, and C are tetragonal, tetragonal nanotwin, and cubic phases, respectively. T(TNT) and C(TNT) indicate that minor TNT domains reside in the T and C matrices. Nanotwins, which can cause broad diffraction peak, remain above TC≅518 K and give an average microscopic cubic symmetry in the polarizing microscopy. Colossal dielectric permittivity (>104) was observed above room temperature with strong frequency dispersion. This study suggests that nanotwins can play an important role in relaxor ferroelectric crystals while phase transition takes place. The Fe ion is a potential candidate as a B-site dopant for enhancing dielectric permittivity.
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title Nanotwin and phase transformation in tetragonal Pb(Fe1/2Nb1/2)1−xTixO3 single crystal
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