Effect of Se on Structure and Electrical Properties of Ge-As-Te Glass

• Published in: Materials Vol. 15; no. 5; p. 1797
• Main Authors: Liu, Kangning, Kang, Yan, Tao, Haizheng, Zhang, Xianghua, Xu, Yinsheng
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 27.02.2022; MDPI
• Subjects: chalcogenide glass; Chemical Sciences; Conductivity; Crystallization; Dielectric properties; Electrical properties; electrical property; Glass; Infrared spectra; Metallicity; optical property; Optics; Pyramids; Raman spectra; Refractivity; Tellurium; Tetrahedra; thermal property; Thermal stability; Germany; Raman spectra; optical property; thermal property; electrical property; chalcogenide glass
• ISSN: 1996-1944; 1996-1944
• 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 [GeTe Se ] 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.