title: Research on optical band gap of the novel GeSe2-In2Se3-KI chalcohalide glasses.
abstract: The glass-forming region of the GeSe(2)-In(2)Se(3)-KI system was reported firstly. The dependence of physical, thermal and optical properties on compositions as formula of (1-x)(0.8GeSe(2)-0.2In(2)Se(3))-xKI (x=0, 0.1, 0.2, 0.3) chalcohalide glasses was investigated. The allowed direct transition and indirect transition, and Urbach energy of samples were calculated according to the classical Tauc equation. The results show that the glass system has good thermal stability and that there is an obvious blue-shift at the visible absorbing cutting-off edge. When the dissolved amount of KI increased from 0 to 30mol%, the direct optical band gap and the indirect optical band gap were in the range from 1.617 to 1.893eV and 1.573 to 1.857eV. With the decrease of the molar refraction the refractive index decreases, optical band gap and metallization criterion increase. The relationship between energy band gap and metallization criterion was analyzed and the optical properties of chalcohalide glasses were summarized.
authors.affiliation: Faculty of Information Science and Engineering, Ningbo University, Ningbo, China. wodehaiyang88@126.com
authors.forename: Guoxiang
authors.initials: G
authors.lastname: Wang
authors.forename: Qiuhua
authors.initials: Q
authors.lastname: Nie
authors.forename: Xunsi
authors.initials: X
authors.lastname: Wang
authors.forename: Shixun
authors.initials: S
authors.lastname: Dai
authors.forename: Mingxing
authors.initials: M
authors.lastname: Zhu
authors.forename: Xiang
authors.initials: X
authors.lastname: Shen
authors.forename: Kun
authors.initials: K
authors.lastname: Bai
authors.forename: Xianghua
authors.initials: X
authors.lastname: Zhang
mesh_terms: D018011:Chalcogens / Q000737:chemistry*; D005857:Germanium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D055095:Optics and Photonics; D011193:Potassium Iodide / Q000737:chemistry*; D012643:Selenium / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013816:Thermodynamics
chemical_list: D018011:Chalcogens; D005857:Germanium; D007204:Indium; D011193:Potassium Iodide; D012643:Selenium