Evolution of Defective State of Aluminum Oxide Irradiated with Chromium Ions after Annealing in Oxygen Environment

7th International Conference Radiation-thermal Effects and Processes in Inorganic Materials

材料科学;物理学

Kabyshev, A.V.^1 ; Konusov, F.V.^1

National Research Tomsk Polytechnic University, Lenin Avenue, 30, Tomsk

634050, Russia^1

关键词: Annealing in vacuum;    Characteristics of defect;    Defective state;    Intrinsic radiation;    Optical parameter;    Polycrystalline;    Substitutional defects;    Thermal and chemical stabilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/168/1/012001/pdf
DOI  :  10.1088/1757-899X/168/1/012001

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The characteristics of interband and exponential optical absorption of leucosapphire and polycrystalline corundum (polycor) after irradiation with chromium ions and subsequent annealing in vacuum at 300-1800 K and in air at 300-800 K are studied. Contributions of defects with different thermal and chemical stability into optical parameters were established. The effect of intrinsic radiation defects, of substitutional defects and of complexes on base of oxygen and defects on formation the focal point in absorption spectra owing to fulfilment of the Urbach rule was determined. Heating in air of strongly defective material synthesized in surface layers of alumina by the ion-heat modification influences the characteristics of defects and the electronic structure of band gap negligibly.