Optical absorption spectra of 10-MeV electron-irradiated paratellurite single crystals

• Published in: Radiation effects and defects in solids Vol. 153; no. 3; pp. 205 - 210
• Main Authors: Azhniuk, Yu. M., Gomonnai, A. V., Goyer, D. B., Holovey, V. M., Megela, I. G., Lopushansky, V. V.
• Format: Journal Article
• Language: English
• Published: Reading Taylor & Francis Group 01.02.2001; Taylor and Francis
• Subjects: Absorption; absorption edge; Annealing; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Electrons and positron radiation effects; Exact sciences and technology; Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity); Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physical radiation effects, radiation damage; Physics; Structure of solids and liquids; crystallography; Urbach; Vacancy; Optical spectrometry; Monocrystals; Inorganic compounds; Vacancies; Fluence; Physical radiation effects; Oxides; Experimental study; Thermal annealing; Tellurium oxides; Electrons
• ISSN: 1042-0150; 1029-4953
• DOI: 10.1080/10420150108211839

Optical absorption spectra of TeO 2 crystals, irradiated at room temperature by up to 2·10 18 cm −2 10-MeV electrons and subsequently annealed to 575K, are studied. The dependence of Urbach absorption edge parameters in TeO 2 on the electron beam fluence is discussed. The irradiation-induced near-edge broad (2.5-3.5eV) absorption band is shown to be related to oxygen vacancies, annealing at 475-525K.