Dielectric and photoelectric properties of Pb(Mg1/3Ta2/3O3 crystals |
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Authors: | A A Bokov I P Raevskii M A Malitskaya S M Emel’yanov |
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Institution: | (1) Scientific-Research Institute of Physics, Rostov-on-the-Don University, 344104 Rostov-on-the-Don, Russia |
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Abstract: | The temperature dependence of the dielectric constant ɛ and the spectral dependence of the photoconductivity of Pb(Mg1/3Ta2/3)O3 crystals are investigated. The width of the band gap (3.4 eV) is determined. It is found that above the temperature of the
maximum of the dielectric constant, its reciprocal 1/ɛ varies with temperature first quadratically and then according to a linear law, as is characteristic of ferroelectrics with
a smeared phase transition. The smearing parameter of the transition estimated from the experimental data is close to the
value calculated assuming the absence of long-range order in the arrangement of the Mg and Ta ions.
Fiz. Tverd. Tela (St. Petersburg) 40, 109–110 (January 1998) |
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