Regensburg 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 39: Impurities/amorphous semiconductors
HL 39.3: Vortrag
Donnerstag, 29. März 2007, 12:45–13:00, H14
Non-periodicity in atomic structure of cadmium sulfide CdS nanoparticles — •Andrey Vorokh1,2, Andrej A. Rempel1,2, and Andreas Magerl2 — 1Institute of Solid State Chemistry, Russian Academy of Sciences, Pervomaiskaya 91, GSP-145, Ekaterinburg 620219, Russia — 2Crystallography and Structural Physics, University of Erlangen-Nuremberg, Staudtstrasse 3, 91058 Erlangen, Germany
By means of X-ray diffraction experiment and ab initio calculation of powder diffraction intensity using Debye equation it is shown that the atomic structure of cadmium sulfide (CdS) nanoparticles prepared by wet chemical method is disordered. The disordered atomic structure is a closed packed atomic structure with the tetrahedral coordination for both elements, cadmium and sulfur, but with a non-periodical sequence of the closed-packed planes types A, B, and C. The free energy of the disordered structure is higher in compare with the energy of known for CdS crystalline structures, wurtzite (B4 type, ABABAB. . . sequence of closed-packed planes ) and zincblende (B3 type, ABCABC. . . sequence of closed-packed planes).