Browsing by Author "Volnyanskaya, I. P."
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Item Dielectric Properties of the Pb2MoO5 Crystals Irradiated with uv Light(Дніпровський національний університет імені Олеся Гончара, 2017) Volnyanskaya, I. P.; Trubitsyn, Mykhailo P.; Volnyanskii, Dmytro M.; Bondar, D. S.; Shvets, T. V.EN: The dielectric properties of the Pb2MoO5 crystals, exposed to UV light radiation (290 K), were studied. It was shown that UV irradiation led to appearance of permittivity maximum near 530 K (AC field frequency f=1 kHz). Heating up to 700 K resulted in thermal dissociation of the dipole complexes, induced by UV light irradiation and contributing to e peak. The magnitude of the e maximum increased with increasing time of UV light exposure and saturated for t>90 min. It is supposed that the observed anomaly of e is determined by dielectric response of (MoO3)- complexes. These centers arise when photoelectrons are trapped by molybdenum ions with oxygen vacancy VO in the nearest surroundings.Item Solid-Phase Synthesis and X-Ray Analysis of the Charge for Growing Acousto-Optic Pb2MoO5 Crystals(Дніпропетровський національний університет ім. Олеся Гончара, 2016) Volnyanskaya, I. P.; Trubitsyn, Mykhailo P.; Volnyanskii, Dmitriy M.; Kolessov, V. I.EN: Growing single crystals of double lead molybdate Pb2MoO5 is usually accompanied by the appearance of additional phases of PbO–MoO3 system. To improve quality of the grown crystals, it is necessary to provide single phase composition of the charge used. In the paper the regimes of the charge solid-phase synthesis are varied and the phase composition of the obtained charge is studied for the first time. The initial charge stoichiometry, number of stages of synthesis procedure, heating rate, temperature, and time of synthesis are varied in the experiment. X-ray phase analysis is performed for a number of the charge samples obtained under different technological conditions of solid-phase synthesis. It is shown that the appropriate choice of the synthesis regimes make it possible to reduce significantly the content of PbO–MoO3 impurity phases in the charge. The obtained results should make for increasing quality of Pb2MoO5 single crystals which are promising for use in acousto-optic devices.