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Acoustic properties of glycine phosphite crystals with an admixture of glycine phosphate

  • Magnetism and Ferroelectricity
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Abstract

Acoustic and dielectric anomalies in the region of the ferroelectric phase transition in crystals of glycine phosphite (GPI) with a 2 mol % admixture of glycine phosphate (GP) are studied. The acoustic anomalies were found to differ strongly from those observed in nominally pure glycine phosphite crystals. A theoretical analysis of the acoustic and dielectric properties of the crystals was carried out within the model of a pseudoproper ferroelectric phase transition. It is shown that the acoustic anomalies, as well as the temperature dependences of the dielectric constant (for various external electric fields) and pyroelectric current observed in the vicinity of the phase transition in GPI-GP crystals, can be adequately described when the macroscopic polarization present in these crystals above the phase transition temperature is taken into account. The thermodynamic-potential parameters describing electrostriction and the biquadratic relation between the polarization and strain turned out to be close to those characterizing a nominally pure GPI crystal. An irreversible phase transition was observed to occur in GPI-GP crystals at T = 240 K, i.e., above the ferroelectric phase transition temperature.

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Authors and Affiliations

  1. Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia

    E. V. Balashova & V. V. Lemanov

  2. Institute of Macromolecular Compounds, Russian Academy of Sciences, Bol’shoi pr. 31, St. Petersburg, 199034, Russia

    G. A. Pankova

Authors
  1. E. V. Balashova
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  2. V. V. Lemanov
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  3. G. A. Pankova
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Translated from Fizika Tverdogo Tela, Vol. 47, No. 1, 2005, pp. 176–183.

Original Russian Text Copyright © 2005by Balashova, Lemanov, Pankova.

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Balashova, E.V., Lemanov, V.V. & Pankova, G.A. Acoustic properties of glycine phosphite crystals with an admixture of glycine phosphate. Phys. Solid State 47, 183–190 (2005). https://doi.org/10.1134/1.1853474

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