Indirect band gap and optical parameters of pure and doped potassium ferrocyanide single crystals

被引:7
作者
Gaffar, MA [1 ]
Abu-El Fadl, A [1 ]
机构
[1] Assiut Univ, Fac Sci, Dept Phys, Assiut, Egypt
来源
PHYSICA B | 2000年 / 292卷 / 3-4期
关键词
ferroelectrics; potassium ferrocyanide crystals; optical properties;
D O I
10.1016/S0921-4526(00)00466-X
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The optical transmittance for potassium ferrocyanide (KFCT) single crystals were measured as a function of the wavelength at different temperatures in the range 275-320 K along the two axes (I 0 (1) over bar) and (0 1 0) and hence the absorption coefficient (a) and optical band gap E-g were deduced. The type of transition was determined and the validity of Urbach's rule was checked. The steepness parameter (sigma) and the exciton energy E-0 were calculated at different temperatures. The temperature dependence of the energy gap was estimated and the result was confirmed through the calculation of dE(g)/dT from information about sigma. The refractive index, the extinction coefficient and both the real and imaginary parts of the dielectric permittivity were also calculated as a function of photon energy and the results were discussed. The effect of doping KFCT with 2% of sodium nitroproced, cobalt sulphate or potassium dichromate on the same physical parameters was also discussed. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:221 / 232
页数:12
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