Radiation-induced changes in the structure and ferroelectric properties of Pb5Ge3O11 single crystal

Stash, A.I.; Ivanov, S.A.; Boiko, V.M.; Ermakov, V.S.; Stefanovich, S.Y.; Mosunov, A.V.

Авторы: Stash A.I., Ivanov S.A., Boiko V.M., Ermakov V.S., Stefanovich S.Yu, Mosunov A.V.
Журнал: Journal of Structural Chemistry
Том: 62
Номер: 12
Год издания: 2021
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 1880
Последняя страница: 1895
DOI: 10.1134/s0022476621120088
Аннотация: 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.
Добавил в систему: Мосунов Александр Викторович

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Radiation-induced changes in the structure and ferroelectric properties of Pb5Ge3O11 single crystalстатья

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