Abstract
Single crystals of (Pb0.86Sr0.14)5Ge3O11 are prepared by a slow melt cooling. The effect of high-energy electron irradiation with fluences up to 6.2·1018 e/cm2 on the structural and dielectric properties of these crystals is studied; the dependence of crystal structure parameters on the fluences is considered; the structural mechanism of selective substitution of Pb by Sr is established. It is determined that the sites occupied by lead with a lone pair are not substituted by strontium cations. Up to the fluences of 6.2·1018 e/cm2, the (Pb0.86Sr0.14)5Ge3O11 structure remains perfect. It is shown that the irradiation with these fluences preserves the paraelectric structure at 293 K (\(P\bar{6}\) space group) and causes only minor atomic displacements. The temperature dependences of the dielectric permittivity and the dielectric loss (in the ranges of 5-300 K and 1-1000 kHz) show that the irradiation shifts TC from 158 K to 145 K and increases the diffusion of the ferroelectric phase transition.
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The part of work conducted in the RTU MIREA was funded by the Ministry of Science and Higher Education of the Russian Federation within the State Assignment (project FSFZ-2023-0005) and was performed using the equipment of the Common Use Center of RTU MIREA funded by the Ministry of Science and Higher Education of the Russian Federation within the Agreement dated 01.09.2021 No. 075-15-2021-689.
The research by S. A. Ivanov was funded by the Russian Science Foundation (project 22-13-00122).
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Russian Text © The Author(s), 2023, published in Zhurnal Strukturnoi Khimii, 2023, Vol. 64, No. 6, 112367.https://doi.org/10.26902/JSC_id112367
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Stash, A.I., Ivanov, S.A., Bush, A.A. et al. Evolution of the Crystal Structure and the Dielectric Properties of (Pb0.86Sr0.14)5Ge3O11 Single Crystals under High-Energy Electron Irradiation. J Struct Chem 64, 1081–1097 (2023). https://doi.org/10.1134/S0022476623060112
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DOI: https://doi.org/10.1134/S0022476623060112