Pyroelectric properties of real LiNbO3 single crystals grown from a congruent melt |
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| Authors: | Yu. V. Shaldin V. T. Gabriélyan S. Matyjasik |
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| Affiliation: | (1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiĭ pr. 59, Moscow, 119333, Russia;(2) Research Institute of Laser Physics, St. Petersburg, 199034, Russia;(3) International Laboratory of Strong Magnetic Fields and Low Temperatures, Wroclaw, Poland |
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| Abstract: | The temperature dependences of the pyroelectric coefficient of lithium niobate single crystals grown from a congruent melt have been investigated in the range of 4.2–300 K. No anomalies were found at low temperatures, and the experimental dependence is described well by the Debye-Einstein model, with T D = 357 K and two pyroactive frequencies of 692 and 869 cm?1. Specific features of lithium niobate have been analyzed. Two sublattices, formed by two pairs of mesotetrahedra with (according to the symmetry conditions) dipole and octupole moments, were selected in the structure. Their contributions to the total polarization differ by an order of magnitude. Vacuum annealing of the samples leads to the occurrence of anomalies only at temperatures over 280 K; these anomalities are interpreted as a manifestation of superionic conductivity. |
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