Dielectric spectroscopy of Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals

A. R. James, Shashank Priya, Kenji Uchino, K. Srinivas

Research output: Contribution to journalArticle

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Abstract

Complex impedance spectroscopic data were acquired on single crystals of the morphotropic phase boundary composition of 0.68Pb(Mg1/3Nb2/3)O3-0.32PbTiO3 over a wide range of temperatures (25-525°C) and frequencies 1 kHz-1 MHz. This study takes advantage of plotting ac data simultaneously in the form of impedance and modulus spectroscopic plots. This permits the easy interpretation of microscopic processes responsible for the measured ac response. Frequency explicit plots of imaginary components of impedance and modulus exhibit Debye-like peak shapes. The data for ac conductivity were computed from the impedance data and the activation energy for conduction at different frequencies was determined. Cole-Cole diagrams were plotted and these indicate the presence of a single relaxation process. The relaxation times determined from these plots followed an Arrhenius law, and the activation energy for relaxation was found to be 1.2 eV. The ac conductivity data was found to obey Jonscher's universal power law and resulted in a value of the exponent "n" =0.95.

Original languageEnglish (US)
Pages (from-to)3504-3508
Number of pages5
JournalJournal of Applied Physics
Volume90
Issue number7
DOIs
StatePublished - Oct 1 2001

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impedance
plots
single crystals
spectroscopy
activation energy
conductivity
plotting
relaxation time
diagrams
exponents
conduction
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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abstract = "Complex impedance spectroscopic data were acquired on single crystals of the morphotropic phase boundary composition of 0.68Pb(Mg1/3Nb2/3)O3-0.32PbTiO3 over a wide range of temperatures (25-525°C) and frequencies 1 kHz-1 MHz. This study takes advantage of plotting ac data simultaneously in the form of impedance and modulus spectroscopic plots. This permits the easy interpretation of microscopic processes responsible for the measured ac response. Frequency explicit plots of imaginary components of impedance and modulus exhibit Debye-like peak shapes. The data for ac conductivity were computed from the impedance data and the activation energy for conduction at different frequencies was determined. Cole-Cole diagrams were plotted and these indicate the presence of a single relaxation process. The relaxation times determined from these plots followed an Arrhenius law, and the activation energy for relaxation was found to be 1.2 eV. The ac conductivity data was found to obey Jonscher's universal power law and resulted in a value of the exponent {"}n{"} =0.95.",
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Dielectric spectroscopy of Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals. / James, A. R.; Priya, Shashank; Uchino, Kenji; Srinivas, K.

In: Journal of Applied Physics, Vol. 90, No. 7, 01.10.2001, p. 3504-3508.

Research output: Contribution to journalArticle

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T1 - Dielectric spectroscopy of Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals

AU - James, A. R.

AU - Priya, Shashank

AU - Uchino, Kenji

AU - Srinivas, K.

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AB - Complex impedance spectroscopic data were acquired on single crystals of the morphotropic phase boundary composition of 0.68Pb(Mg1/3Nb2/3)O3-0.32PbTiO3 over a wide range of temperatures (25-525°C) and frequencies 1 kHz-1 MHz. This study takes advantage of plotting ac data simultaneously in the form of impedance and modulus spectroscopic plots. This permits the easy interpretation of microscopic processes responsible for the measured ac response. Frequency explicit plots of imaginary components of impedance and modulus exhibit Debye-like peak shapes. The data for ac conductivity were computed from the impedance data and the activation energy for conduction at different frequencies was determined. Cole-Cole diagrams were plotted and these indicate the presence of a single relaxation process. The relaxation times determined from these plots followed an Arrhenius law, and the activation energy for relaxation was found to be 1.2 eV. The ac conductivity data was found to obey Jonscher's universal power law and resulted in a value of the exponent "n" =0.95.

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