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1993 (2)
1Author    Ryosei Uno, Haruo Ozawa, Jun Ishigaki, Ken YukinoRequires cookie*
 Title    Electron Distribution in Some Zincblende-Type Crystals  
 Abstract    The elctron density distribution in crystalline ZnSe and ZnTe has been measured by X-ray diffraction on powder samples and is compared with the results for other zincblende-type crystals. It is shown that the data for these two compounds corroborate the linear dependence on the bond charge that has been found earlier for the effective atomic charge from infrared reflection measure-ments, the optical dielectric constant and the ionicity estimated from pseudopotential band theory. 
  Reference    Z. Naturforsch. 48a, 38—40 (1993); received January 10 1992 
  Published    1993 
  Keywords    Zincblende-type crystals, Bond charge, Ionicity, X-ray powder diffraction, Electron density distribution 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0038.pdf 
 Identifier    ZNA-1993-48a-0038 
 Volume    48 
2Author    Masaki Takata, Yoshiki Kubota, Makoto SakataRequires cookie*
 Title    The Electron Density Distribution in Be Metal Obtained from Synchrotron-Radiation Powder Data by the Maximum-Entropy Method  
 Abstract    The nature of the bonding in Be metal was studied by investigating the MEM map, which is the electron density distribution obtained by the Maximum-Entropy Method. In order to avoid extinc-tion effects, 19 Bragg reflections were measured by a new powder-diffraction experiment that utilizes Synchrotron Radiation as an incident X-ray and an Imaging Plate as detector. The experiment was carried out at the Photon Factory BL6A2. In spite of the limited number of reflections used in the MEM analysis, the electron density distribution of Be was obtained accurately and reliably. The structure factors for unmeasured reflections were calculated and compared with the values observed by Larsen and Hansen [Acta Cryst. B40, 169 (1984)]. The agreement is very good. Furthermore, the MEM map revealed that Be metal forms an electronic layer in the shape of a honeycomb that is parallel to the basal plane. 
  Reference    Z. Naturforsch. 48a, 75—80 (1993); received December 28 1991 
  Published    1993 
  Keywords    Maximum entropy method, Be metal, Electron density distribution, X-ray powder diffraction, HCP structure 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0075.pdf 
 Identifier    ZNA-1993-48a-0075 
 Volume    48