Effect of stoichiometry on the thermal expansion coefficients of lithium niobate single crystals

被引：8
|
作者：
Singh, K [1 ]
Saodekar, PV
Bhoga, SS
机构：
[1] Amravati Univ, Dept Phys, Amravati 444602, India
[2] Jagadamba Mahavidyalaya, Dept Phys, Achalpur 444806, India
[3] Hislop Coll, Dept Phys, Nagpur 440001, Maharashtra, India
来源：
BULLETIN OF MATERIALS SCIENCE | 1998年 / 21卷 / 06期
关键词：
single crystal; thermal expansion; non-stoichiometry; defects; octahedra;
D O I：
10.1007/BF02790348
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The chemical analysis of LiNbO3 single crystals, with different melt compositions (Li/Nb)(m) = 0.945, 1.0, 1.1 and 1.2, grown by slow cooling technique, reveals a remarkable difference in solid and melt compositions, The thermal expansion coefficients along a and c axes, determined by using Newton's ring experiment, are found to increase anisotropically with increase in (Li/Nb), ratio. The variation in thermal expansion coefficient with increase in the (Li/Nb)nl ratio is discussed in the light of defect chemistry i.e. the partial replacement of Li+ by excess Nb5+ creates additional cation vacancies to attain the electro-neutrality in the crystal.
引用
收藏
页码：469 / 474
页数：6
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