OPTICAL-PROPERTIES OF REDUCED LITHIUM-NIOBATE SINGLE-CRYSTALS

被引：159
作者：
DHAR, A
MANSINGH, A
机构：
[1] NATL PHYS LAB, NEW DELHI 110012, INDIA
[2] UNIV DELHI, DEPT PHYS & ASTROPHYS, DELHI 110007, INDIA
来源：
JOURNAL OF APPLIED PHYSICS | 1990年 / 68卷 / 11期
关键词：
D O I：
10.1063/1.346951
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The optical transmission of LiNbO3 single crystals has been measured in the wavelength range 200-900 nm, for different degrees of reduction, to study the effect of reduction on the optical characteristics of LiNbO 3 near the fundamental absorption edge. The optical transitions in LiNbO3 were found to be indirect and the band gap decreased with increasing degree of reduction. The band observed at 2.48 eV in the absorption spectrum in heavily reduced samples has been attributed to the formation of polarons, and the theoretical model of Reik and Heese [J. Chem. Solids 28, 581 (1967)] for small polarons is used to correlate the optical and electrical properties.
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页码：5804 / 5809
页数：6
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