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首页> 外文期刊>Physica, B. Condensed Matter >Compositional dependence of the optical properties of the amorphous GexTe1-x system
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Compositional dependence of the optical properties of the amorphous GexTe1-x system

机译：非晶态GexTe1-x系统光学特性的成分依赖性

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Optical absorption at room temperature of vacuum evaporated GexTe1?x (0.125x0.225) amorphous thin films has been studied as a function of composition. It was found that the optical absorption is due to a direct transition. The real and imaginary parts of the dielectric constant were determined. The single-oscillator energy (Eo) and the energy dispersion parameter (Ed) have been calculated and discussed in terms of the Wemple and Di-Domenico model. The relationship between the optical gap, the average heat of atomization and the coordination numbers has been determined. The optical properties of the amorphous thin films do not change monotonically with increasing Ge content. The observed behavior of the optical properties in the range of compositions studied are explained on the basis of the Bond Constraint Theory (BCT) and rigidity theory, which provide a powerful framework for understanding the structure and properties of amorphous materials. The non-monotonic variation of the optical properties indicates that a transition from floppy to rigid occurs in the GexTe1?x films.
机译：已经研究了真空蒸发的GexTe1x（0.125x0.225）非晶薄膜在室温下的光吸收与组成的关系。发现光吸收是由于直接跃迁引起的。确定介电常数的实部和虚部。已经根据Wemple和Di-Domenico模型计算并讨论了单振荡器能量（Eo）和能量色散参数（Ed）。已经确定了光学间隙，平均雾化热和配位数之间的关系。非晶态薄膜的光学特性不会随着Ge含量的增加而单调变化。在键合约束理论（BCT）和刚度理论的基础上解释了在所研究的成分范围内观察到的光学性能，这为理解非晶材料的结构和性能提供了强大的框架。光学性能的非单调变化表明在GexTe1x薄膜中发生了从软盘到刚性的转变。

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