Effect of an Iron Impurity on the Electrical Conductivity of LiNbO3 Crystals

被引：4
|
作者：
Yatsenko, A. V. [1 ]
Evdokimov, S. V. [1 ]
机构：
[1] Vernadsky Fed Univ, Simferopol, Republic Of Cri, Ukraine
来源：
PHYSICS OF THE SOLID STATE | 2020年 / 62卷 / 03期
关键词：
lithium niobate; LiNbO3; photoresistive effect; electrical conductivity; polarons; impurities; LITHIUM-NIOBATE CRYSTALS; CHARGE-TRANSPORT; DARK DECAY; HOLOGRAMS; FEATURES; LITAO3;
D O I：
10.1134/S1063783420030269
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The electrical conductivity of a series of LiNbO3 crystals grown from the charge of the congruent composition with relatively low iron concentration (up to 0.15 wt % Fe2O3) has been studied experimentally. It is found that, at temperatures close to 300 K, the main contribution to the electrical conductivity of these crystals is from two types of the centers with close activation energies. The first type of centers are Fe2+ ions, which determines the impurity electron conductivity with the activation energy (0.34 +/- 0.01) eV. The second type of centers are polarons of small radius with the activation energy (0.29 +/- 0.02) eV. The polaron conductivity is shown to be dominate for nominally impurity-free and low-doped "as-grown" LiNbO3 crystals at T = 300 K.
引用
收藏
页码：485 / 491
页数：7
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