A random-field model for polarization reversal in Pb(Yb 1/2Nb 1/2)O 3-PbTiO 3 single crystals

Shujun Zhang, Shashank Priya, Eugene Furman, Thomas R. Shrout, Clive A. Randall

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Polarization switching and dielectric temperature behavior have been investigated in 0.55Pb(Yb 1/2Nb 1/2)O 3-0. 45PbTiO 3 (PYN-PT) single crystals. These compositions are of interest owing to their unusually high Curie temperature and high coercive fields. The dielectric permittivity was determined as function of temperature and the polarization was measured as a function of applied field for different drive frequencies. Analysis of the experimental results with a random-field model was found to show similar trends to recent reports for the Pb(Mg 1/3Nb 2/3)O 3 relaxor materials. The frequency dispersion of the maximum in dielectric spectra, T max, was also analyzed with the Vogel-Fulcher relation yielding a high freezing temperature of 577 K. Polarization behavior was found to follow a stretched exponential time dependence and a fractal dimension of ∼2.2 was obtained. It is proposed that the polar cluster state in PYN-PT single crystals do not freeze in random orientations but rather arrange locally in preferred configurations. The fraction of the clusters decreases under increasing external field drive, resulting in the formation of the percolated network at higher fields.

Original languageEnglish (US)
Pages (from-to)6002-6006
Number of pages5
JournalJournal of Applied Physics
Volume91
Issue number9
DOIs
StatePublished - May 1 2002

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single crystals
polarization
freezing
time dependence
temperature
Curie temperature
fractals
permittivity
trends
configurations

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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abstract = "Polarization switching and dielectric temperature behavior have been investigated in 0.55Pb(Yb 1/2Nb 1/2)O 3-0. 45PbTiO 3 (PYN-PT) single crystals. These compositions are of interest owing to their unusually high Curie temperature and high coercive fields. The dielectric permittivity was determined as function of temperature and the polarization was measured as a function of applied field for different drive frequencies. Analysis of the experimental results with a random-field model was found to show similar trends to recent reports for the Pb(Mg 1/3Nb 2/3)O 3 relaxor materials. The frequency dispersion of the maximum in dielectric spectra, T max, was also analyzed with the Vogel-Fulcher relation yielding a high freezing temperature of 577 K. Polarization behavior was found to follow a stretched exponential time dependence and a fractal dimension of ∼2.2 was obtained. It is proposed that the polar cluster state in PYN-PT single crystals do not freeze in random orientations but rather arrange locally in preferred configurations. The fraction of the clusters decreases under increasing external field drive, resulting in the formation of the percolated network at higher fields.",
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A random-field model for polarization reversal in Pb(Yb 1/2Nb 1/2)O 3-PbTiO 3 single crystals. / Zhang, Shujun; Priya, Shashank; Furman, Eugene; Shrout, Thomas R.; Randall, Clive A.

In: Journal of Applied Physics, Vol. 91, No. 9, 01.05.2002, p. 6002-6006.

Research output: Contribution to journalArticle

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AB - Polarization switching and dielectric temperature behavior have been investigated in 0.55Pb(Yb 1/2Nb 1/2)O 3-0. 45PbTiO 3 (PYN-PT) single crystals. These compositions are of interest owing to their unusually high Curie temperature and high coercive fields. The dielectric permittivity was determined as function of temperature and the polarization was measured as a function of applied field for different drive frequencies. Analysis of the experimental results with a random-field model was found to show similar trends to recent reports for the Pb(Mg 1/3Nb 2/3)O 3 relaxor materials. The frequency dispersion of the maximum in dielectric spectra, T max, was also analyzed with the Vogel-Fulcher relation yielding a high freezing temperature of 577 K. Polarization behavior was found to follow a stretched exponential time dependence and a fractal dimension of ∼2.2 was obtained. It is proposed that the polar cluster state in PYN-PT single crystals do not freeze in random orientations but rather arrange locally in preferred configurations. The fraction of the clusters decreases under increasing external field drive, resulting in the formation of the percolated network at higher fields.

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