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Investigation on chalcogenide glasses for its threshold phenomena using photothermal methods

机译：用光热法研究硫族化物玻璃的阈值现象

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Photoacoustic spectroscopy (PAS) and Photothermal beam deflection spectroscopy (PBS) was used to study the bulk Ge_(7.5)As_xTe_(92.5-x) alloy glasses in the composition range, 17.5 < = x < = 60 [co-ordination number (, 2.35-2.75] for its thermal diffusivity (alpha), alpha was found to be maximum for = 2.4 (0.85 X 10~(-2) cm~2/s), with increase in there was a steep decrease except for a small hump observed at = 2.67(0.44 X 10~(-2)cm~2/s).Thisobservedbehaviourisexplainedonthebasisoftwotransitionspointsat = 2.4 and = 2.67, that correspond to mechanical and chemical thresholds respectively. The advantage of PAS and PBS is highlighted in comparison with the conventional absorption spectrophotometric technique. These methods are independent of sample thickness and are not affected by light scattering which is ideally suited for studying chalcogenide glassy systems. The experimental data was curve-fitted using the one-dimensional heat diffusion equation to evaluate the accuracy of the thermal diffusivity values obtained.
机译：使用光声光谱（PAS）和光热束偏转光谱（PBS）研究组成范围为17.5 <= x <= 60 [配位数（< r>，2.35-2.75]的热扩散率（alpha），发现 = 2.4时alpha最大值（0.85 X 10〜（-2）cm〜2 / s），其中增大除了在 = 2.67（0.44 X 10〜（-2）cm〜2 / s）处观察到小的驼峰外，其急剧下降。此观察性是在两个转变点（r> = 2.4和 = 2.67）的基础上进行的解释，这对应于机械和与传统的吸收分光光度法相比，PAS和PBS的优势更加突出，这些方法不受样品厚度的影响，不受光散射的影响，非常适合研究硫族化物玻璃态体系，实验数据是曲线用一维热扩散方程拟合来评估获得的热扩散率值的准确性。

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