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

被引：0
作者：
Sorokin, N. I. [1 ]
Shaldin, Yu. V. [1 ]
机构：
[1] Russian Acad Sci, Shubnikov Inst Crystallog Crystallog & Photon, Moscow, Russia
来源：
PHYSICS OF THE SOLID STATE | 2018年 / 60卷 / 04期
关键词：
DIELECTRIC-PROPERTIES; SINGLE-CRYSTALS; CONDUCTIVITY; GROWTH;
D O I：
10.1134/S1063783418040315
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
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 Pna2(1)), 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: sigma(parallel to c) = 1.0 x 10(-5) S/cm at 573 K. Wherein the characteristics of the anisotropy of ionic conductivity of the crystals is equal to sigma(parallel to c) /sigma(parallel to a) = 3 and sigma(parallel to c) /sigma(parallel to b) = 24. The thermal annealing at 1000 K for 10 h in vacuum increases the magnitude of sigma(parallel to c) of KTiOPO4 by a factor of 28 and leads to an increase in the ratio sigma(parallel to c) /sigma(parallel to b) = 2.1 x 10(3) at 573 K. A crystal-physical model of ionic transport in KTiOPO4 crystals has been proposed.
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页码：710 / 713
页数：4
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