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Crystal-Physical Model of Ion Transport in Nonlinear Optical Crystals of KTiOPO4

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Abstract

The ionic conductivity along the principal axes a, b, and c of the unit cell of the nonlinear-optical high-resistance KTiOPO4 single crystals (rhombic syngony, space group Pna21), which are as-grown and after thermal annealing in vacuum, has been investigated by the method of impedance spectroscopy. The crystals were grown from a solution-melt by the Czochralski method. The as-grown KTiOPO4 crystals possess a quasi-one-dimensional conductivity along the crystallographic c axis, which is caused by the migration of K+ cations: σ║c = 1.0 × 10–5 S/cm at 573 K. Wherein the characteristics of the anisotropy of ionic conductivity of the crystals is equal to σ║c/σ║a= 3 and σ║c/σ║b= 24. The thermal annealing at 1000 K for 10 h in vacuum increases the magnitude of σ║c of KTiOPO4 by a factor of 28 and leads to an increase in the ratio σ║c/σ║b= 2.1 × 103 at 573 K. A crystal-physical model of ionic transport in KTiOPO4 crystals has been proposed.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography “Crystallography and Photonics”, Russian Academy of Sciences, Moscow, Russia

    N. I. Sorokin & Yu. V. Shaldin

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  1. N. I. Sorokin
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  2. Yu. V. Shaldin
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Correspondence to N. I. Sorokin.

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Original Russian Text © N.I. Sorokin, Yu.V. Shaldin, 2018, published in Fizika Tverdogo Tela, 2018, Vol. 60, No. 4, pp. 706–709.

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Sorokin, N.I., Shaldin, Y.V. Crystal-Physical Model of Ion Transport in Nonlinear Optical Crystals of KTiOPO4. Phys. Solid State 60, 710–713 (2018). https://doi.org/10.1134/S1063783418040315

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