On the real structure of profiled anion-deficient corundum

2016 International Conference on Defects in Insulating Materials

Maksimov, V.I.^1 ; Sokolov, V.I.^1 ; Surdo, A.I.^2,3 ; Abashev, R.M.^2,3 ; Yushkova, E.N.^1

Institute of Metal Physics UB RAS, 18 S. Kovalevskaya Str., Ekaterinburg

620990, Russia^1

Ural Federal University, 19 Mira Str., Ekaterinburg

620002, Russia^2

Institute of Industrial Ecology UB RAS, 20 S. Kovalevskaya Str., Ekaterinburg

620219, Russia^3

关键词: As-grown crystal;    Main structure;    Real structure;    Stepanov's method;    Synthesised;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/169/1/012017/pdf
DOI  :  10.1088/1757-899X/169/1/012017

来源: IOP

【 摘 要 】

Profiled Al2O3single crystals grown by Stepanov's method to obtain anion-deficient composition were characterized by neutron diffraction at T=300 K for the first time. Whereas the main structure motif of investigated crystals is checked to be of corundum-type, the scattering pictures of as-grown crystal demonstrate pronounced anomalies being probably indications on substructure forming. However, neutron scanning of synthesised crystal taken after annealing under restoring conditions reveals additional effects associated with displacement type superstructure.