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首页> 外文期刊>Physica, B. Condensed Matter >Influence of strontium doping on the indirect band gap and optical constants of ammonium zinc chloride crystals
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Influence of strontium doping on the indirect band gap and optical constants of ammonium zinc chloride crystals

机译：锶掺杂对氯化铵锌晶体间接带隙和光学常数的影响

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Optical transmittance measurements near the absorption edge in the energy range 3.4-6.4eV have been carried out on (NH4)(2)ZCl(4):xSr(2+) single crystals with x = 0.000%, 0.020%, 0.039%, 0.087% or 0.144%. The introduction of Sr2+ in low concentration, x = 0.02% or 0.039%, little bleach the intense charge transfer band observed for the undoped sample with a maximum at 5.30 eV. Doping with Sr2+ in a little bit higher concentration, x = 0.087% or 0.144%, led to the disappearance of this band. While doping with Sr2+ has no effect on the indirect allowed type of optical transition in AZC, the optical energy gap decreased with increasing Sr2+ concentration. Measuring reflectance of AZC permitted the calculation of the refractive index n, the extinction coefficient K and both the real epsilon(r) and imaginary epsilon(i) components of the dielectric permittivity as functions of photon energy. The validity of Cauchy-Sellimaier equation was checked in the wavelength range 5.45-5.8 eV and its parameters were calculated. Applying the single-effective-oscillator model, the moments of epsilon(E) could be estimated. Electric susceptibility, as a measure of intraband transition, was calculated and its dependence on photon energy was considered. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 30]
机译：在（NH4）（2）ZCl（4）：xSr（2+）单晶上在x = 0.000％，0.020％，0.039％， 0.087％或0.144％。低浓度x = 0.02％或0.039％的Sr2 +的引入几乎消除了未掺杂样品在5.30 eV时的最大电荷转移带。 Sr2 +的掺杂浓度较高，x = 0.087％或0.144％，导致该谱带消失。虽然掺杂Sr2 +对AZC的间接允许的光跃迁类型没有影响，但是光能隙随着Sr2 +浓度的增加而减小。测量AZC的反射率可以计算出折射率n，消光系数K以及介电常数的实ε和虚ε分量与光子能量的函数关系。在5.45-5.8 eV的波长范围内检查了Cauchy-Sellimaier方程的有效性，并计算了其参数。应用单有效振荡器模型，可以估计ε（E）的矩。计算了电敏感性，作为带内跃迁的量度，并考虑了其对光子能量的依赖性。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：30]

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