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Photodielectric effect in lead molybdate monocrystals
Author(s) -
Volnianskiy M. D.,
Kudzin A. Yu.,
Plyaka S. N.,
Balasmeh Z. H.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200420018
Subject(s) - molybdate , polarizability , dielectric , permittivity , dielectric permittivity , band gap , sunlight , materials science , electron , photon energy , ultraviolet , lattice (music) , chemistry , photon , condensed matter physics , optics , optoelectronics , inorganic chemistry , physics , organic chemistry , quantum mechanics , molecule , acoustics
Abstract Illumination by light with photon energy near the band gap increases the dielectric permittivity of lead molybdate (PbMoO 4 ) crystals. This photodielectric effect (PDE) is observed at low measured frequencies (less than 10 kHz). A plot of dielectric permittivity against temperature has a wide maximum in the 470–500 K interval. The PDE essentially increases after exposure to sunlight or ultraviolet light. The PDE may be explained by the increase of polarizability of complex lattice defects by photoexcited electrons. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)