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RADIATION-INDUCED CHANGES IN THE STRUCTURE AND FERROELECTRIC PROPERTIES OF Pb5Ge3O11 SINGLE CRYSTALS

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Abstract

Perfect stoichiometric Pb5Ge3O11 single crystals are irradiated with 60Co γ-rays (1·106 Rad) and high-energy electrons (0.13 e/cm2, 0.89 e/cm2, 2.18 e/cm2, 3.07·1018 e/cm2) at the Karpov Institute of Physical Chemistry. Changes in the structural and ferroelectric properties of the crystals are traced depending on the irradiation type and dose. Dielectric spectroscopy and second harmonic generation of laser radiation are used to determine the ferroelectric phase transition temperature TС. X-ray diffraction experiments are carried out on a Bruker D8 QUEST diffractometer with a PHOTON-II detector (MoKα radiation, 295 K). Based on the experimental structural amplitudes the crystal structures of the crystals before and after irradiation are solved and refined. Structural characteristics of the non-irradiated crystal are consistent with the previously reported data at the achieved significant improvement of their accuracy (R(F > 2σ(F)) = 0.028). Despite radiation defects introduced, Pb5Ge3O11 single crystals retain the crystal structure and ferroelectric properties. It is shown that irradiation performed maintains the polar structure at 295 K and causes changes in atomic displacements of separate atoms. It is supposed that a radiation-induced change in the Pb5Ge3O11 structure is of the high-temperature type and forms a new structural state close to a high-temperature modification of a non-irradiated Pb5Ge3O11 crystal. Irradiation leads to a gradual decrease in distortions and structure symmetrization. It is important that the kinetics and final products of these processes appreciably differ from those observed only upon thermal impacts. Polar shifts are calculated, and their dependence on the irradiation dose indicates a tendency to a decrease in polar shifts in lead germanate ferroelectric during irradiation.

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Funding

The work was supported by RFBR (grant No. 20-03-00337).

XRD studies were supported by the Ministry of Sciences and Higher Education of the Russian Federation and were carried out using the facilities of the Molecular Structure Research Center, Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia.

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Authors and Affiliations

  1. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia

    A. I. Stash

  2. Faculty of Chemistry, Moscow State University, Moscow, Russia

    S. A. Ivanov, S. Yu. Stefanovich & A. V. Mosunov

  3. Karpov Institute of Physical Chemistry, Obninsk, Russia

    V. M. Boiko & V. S. Ermakov

Authors
  1. A. I. Stash
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  2. S. A. Ivanov
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  3. V. M. Boiko
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  4. V. S. Ermakov
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  5. S. Yu. Stefanovich
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  6. A. V. Mosunov
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Correspondence to A. I. Stash.

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Russian Text © The Author(s), 2021, published in Zhurnal Strukturnoi Khimii, 2021, Vol. 62, No. 12, pp. 1999-2015.https://doi.org/10.26902/JSC_id84213

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Stash, A.I., Ivanov, S.A., Boiko, V.M. et al. RADIATION-INDUCED CHANGES IN THE STRUCTURE AND FERROELECTRIC PROPERTIES OF Pb5Ge3O11 SINGLE CRYSTALS. J Struct Chem 62, 1880–1895 (2021). https://doi.org/10.1134/S0022476621120088

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