In an effort to augment thermal and mechanical properties of ternary Ge-Sb-Se glass for use in molded lens applications, mixed-chalcogen Ge_27.5Sb_12.5S_xSe_60-x glasses have been investigated in this study with a particular attention paid to refractive index dispersion as well as infrared transmission edge. Changes in Vickers hardness, glass transition temperature, dilatometric softening temperature and thermal expansion coefficient are elucidated in terms of structural evolutions that sulfur induces. Infrared transmission edge blueshifts upon the addition of sulfur, which can be nicely interpreted in connection with average bond energy and molar mass of a given composition based on a postulation that this glass behaves as a single average harmonic oscillator in shaping multiphonon absorption. Refractive index at the long-wavelength infrared range becomes more dispersive with increasing sulfur content in these sulfur-selenide glasses, and thereby their dispersion can be pinpointed via adjusting S content. The Abbe diagram in the long-wavelength infrared region is extended towards the high-dispersion side, thus enhancing practicality of the chalcogenide glasses as in the form of lens and/or filter for the thermal imaging applications.

为了增强用于模制透镜应用的三元Ge-Sb-Se玻璃的热和机械性能，混合硫族元素Ge _27.5 Sb _12.5 S _x Se _{60- x}在这项研究中对玻璃进行了研究，并特别注意了折射率色散以及红外透射边缘。根据硫引起的结构演变，阐明了维氏硬度，玻璃化转变温度，膨胀软化温度和热膨胀系数的变化。加入硫后，红外传输边缘会发生蓝移，这可以很好地解释为与给定成分的平均键能和摩尔质量有关，这是基于这种玻璃在塑造多声子吸收方面表现为单个平均谐波振荡器的假设。在这些硒化硫玻璃中，随着硫含量的增加，长波红外范围内的折射率变得更加分散，因此可以通过调节S含量来精确地确定它们的分散。