Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 80: Challenges in semiconductor theory

HL 80.9: Vortrag

Donnerstag, 19. März 2015, 17:00–17:15, EW 015

high resolution nuclear inelastic scattering of antimony trioxide — atefeh jafari^1,2,3, ronnie e. simon^1,2, abdelfattah Mahmoud¹, dimitrios bessas³, volkr l. Deringer⁴, ralf stoffel⁴, •richard dronskowski⁴, ilya sergeev⁵, benedikt klobes¹, and raphael p. hermann^1,2 — ¹Jülich Centre for Neutron Science JCNS and Peter Grünberg Institute PGI, Forschungszentrum Jülich, Jülich, Germany — ²Faculty of Sciences, University of Liège, Liège, Belgium — ³European Synchrotron Radiation Facility, Grenoble, France — ⁴Institute of Inorganic Chemistry, RWTH Aachen University Landoltweg 1, Aachen — ⁵Deutsches Elektronen-Synchrotron, Hamburg, Germany

The lattices dynamics of the α and β phases of antimony trioxides (Sb2O3) have been carried out using Mössbauer spectroscopy, nuclear inelastic scattering (NIS) and density functional theory (DFT). The experimental results are in very good agreement with our DFT calculations.The acoustic cut-off frequency of α- Sb2O3 is approximately 78 cm-1 as determined from the density of phonon states, DPS. Complementary to other Raman or IR methods, NIS is a powerful technique which yields the element specific density of phonon states of Mössbauer isotopes. Moreover, due to the high resolution achieved with the backscattering sapphire monochromator, we could identify weak and partially superposed bands.