Liu Kangning, Kang Yan, Tao Haizheng, Zhang Xianghua, Xu Yinsheng
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
ISCR (Institut Des Sciences Chimiques de Rennes)-UMR 6226, CNRS, Université de Rennes 1, 35042 Rennes, France.
Materials (Basel). 2022 Feb 27;15(5):1797. doi: 10.3390/ma15051797.
The Ge-As-Te glass has a wide infrared transmission window range of 3-18 μm, but its crystallization tendency is severe due to the metallicity of the Te atom, which limits its development in the mid- and far-infrared fields. In this work, the Se element was introduced to stabilize the Ge-As-Te glass. Some glasses with Δ ≥ 150 °C have excellent thermal stability, indicating these glasses can be prepared in large sizes for industrialization. The Ge-As-Se-Te (GAST) glasses still have a wide infrared transmission window (3-18 μm) and a high linear refractive index (3.2-3.6), indicating that the GAST glass is an ideal material for infrared optics. Raman spectra show that the main structural units for GAST glass are [GeTe] tetrahedra, [AsTe] pyramids, and [GeTeSe] tetrahedra, and with the decrease of Te content (≤50 mol%), As-As and Ge-Ge homopolar bonds appear in the glass due to the non-stoichiometric ratio. The conductivity of the studied GAST glasses decreases with the decrease of the Te content. The highest value of 1.55 × 10 S/cm is obtained in the glass with a high Te content. The activation energy of the glass increases with the decrease of the Te content, indicating that the glass with a high Te content is more sensitive to temperature. This work provides a foundation for widening the application of GAST glass materials in the field of infrared optics.
锗 - 砷 - 碲玻璃具有3 - 18μm的宽红外透射窗口范围，但其结晶倾向严重，这是由于碲原子的金属性所致，这限制了其在中红外和远红外领域的发展。在这项工作中，引入了硒元素来稳定锗 - 砷 - 碲玻璃。一些Δ≥150°C的玻璃具有优异的热稳定性，表明这些玻璃可以制成大尺寸用于工业化生产。锗 - 砷 - 硒 - 碲（GAST）玻璃仍然具有宽红外透射窗口（3 - 18μm）和高线性折射率（3.2 - 3.6），这表明GAST玻璃是红外光学的理想材料。拉曼光谱表明，GAST玻璃的主要结构单元是[GeTe]四面体、[AsTe]金字塔和[GeTeSe]四面体，并且随着碲含量的降低（≤50mol%），由于非化学计量比，玻璃中会出现As - As和Ge - Ge同极键。所研究的GAST玻璃的电导率随着碲含量的降低而降低。在高碲含量的玻璃中获得了最高值1.55×10 S/cm。玻璃的活化能随着碲含量的降低而增加，表明高碲含量的玻璃对温度更敏感。这项工作为拓宽GAST玻璃材料在红外光学领域的应用提供了基础。
