Investigation on mechanical properties of some thiourea complex crystals: Important nonlinear optical materials

被引:8
作者
Ganesh, V. [1 ]
Shkir, Mohd [2 ,3 ]
Husain, Rizwan [3 ]
Singh, Rajveer
Rao, T. Bhaskar [1 ,2 ]
Rao, K. Kishan [1 ]
机构
[1] Kakatiya Univ, Dept Phys, Warangal 506009, Andhra Pradesh, India
[2] Univ Delhi, ARSD Coll, Dept Phys, New Delhi 110021, India
[3] Jamia Millia Islamia, Dept Phys, New Delhi 110025, India
来源
OPTIK | 2013年 / 124卷 / 24期
关键词
Growth from solutions; Single crystal growth; Nonlinear optic materials; Nonlinear optical; MICROHARDNESS; GROWTH; HARDNESS; SULFATE; PURE;
D O I
10.1016/j.ijleo.2013.05.087
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
In this work the authors have grown good quality single crystals of zinc thiourea sulphate, bis thiourea cadmium acetate, bis zinc thiourea acetate and bis thiourea zinc chloride were grown from slow evaporation solution growth method at ambient temperature and studied their mechanical properties. The crystal system and lattice parameters were confirmed by powder X-ray diffraction analysis. Vickers microhardness of the grown crystals was investigated by using Leitz-Wetzlar (Miniload 2) hardness tester up to an applied load of 120g. It was observed that, upto 40 g applied load the hardness of the grown crystals increases with increasing the load and thereafter it is practically independent of the indentation load. Meyer's law and Hays-Kendall's law fail to explain the observed load variations. But the variation could be satisfactorily explained by PSR model proposed by Li and Bradt. Classification of cracks and their transition from Palmqvist to median types is explained. The average value of fracture toughness, brittleness index, Young's modulus and yield strength were calculated using expressions for Palmqvist and median types of cracks. Anisotropic nature of the grown crystals was studied using Knoop indentation technique. (C) 2013 Elsevier GmbH. All rights reserved.
引用
收藏
页码:6690 / 6695
页数:6
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