UV irradiation eff ect on the electrical properties of Pb2MoO5 single crystal

doi:10.26565/2222-5617-2018-29-09

I. P. Volnyanskaya 1Prydniprovska state academy of building and architecture, Dnipro, Ukraine
Myhailo Trubitsyn Oles Honchar Dnipro National University, Dnipro, Ukraine
Dmytro Volnyanskii Dnipro National University of Railway Transport named after academician V.Lazaryan, Dnipro, Ukraine
D. S. Bondar Oles Honchar Dnipro National University, Dnipro, Ukraine
T. V. Shvets Oles Honchar Dnipro National University, Dnipro, Ukraine

DOI: https://doi.org/10.26565/2222-5617-2018-29-09

Keywords: dielectric relaxation and loss, UV light irradiation, double lead molybdate crystal

Abstract

Electrical properties of double lead molybdate Pb2MoO5 single crystal were studied in AC fi eld (f=1 kHz) after irradiation with UV light (290 K). It was found that UV irradiation caused appearance of maximums on permittivity ε and conductivity σ temperature dependences, which were observed around 530 K. The anomalies of ε and σ vanished after annealing at 700 K and could be restored by subsequent UV irradiation performed at room temperature. The magnitude of ε and σ peaks increased for higher exposition time. Above 600 K conductivity σ was practically independent on irradiation. It is proposed that photoelectrons induced by UV light, are trapped by Mo located within the oxygen tetrahedrons with vacancy VO in one of the vertexes. The dipole moments of (MoO3)- groups reorient at VO hopping through the tetrahedron vertexes. Annealing at 700 K thermally decomposes (MoO3)- complexes. For T > 600 K behavior of σ(T) is determined by conduction currents and nearly insensitive to UV irradiation. At high temperatures the photoelectrons do not contribute to conductivity since they are bound in (MoO3)- centers, recombine with holes or re-captured by more deep traps.

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