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

页码：469 / 474

页数：6

共 29 条

[1] FERROELECTRIC LITHIUM NIOBATE .5. POLYCRYSTAL X-RAY DIFFRACTION STUDY BETWEEN 24 DEGREES AND 1200 DEGREES C [J].