Lattice dynamics and structure of GeTe, SnTe and PbTe

Paula Bauer Pereira (1, 2) , Ilya Sergueev (1, 3) , Stéphane Gorsse (4) , Jayaram Dadda (5) , Eckhard Müller (5, 6) , Raphaël P. Hermann (1, 2)

1 JCNS - PGI, JARA-FIT - Jülich Centre for Neutron Science
2 Faculté des Sciences
3 ESRF - European Synchrotron Radiation Facility
4 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
5 DLR Institut für Werkstoff-Forschung / Institute of Materials Research
6 Institute of Inorganic and Analytical Chemistry

The lattice dynamics in the IV-VI compounds GeTe, SnTe and PbTe were studied by 125Te and 119Sn nuclear inelastic scattering and the obtained partial density of phonon states were compared with published theoretical calculations. The phase purity and structure were characterized by high energy X-ray diffraction. The effect of the atomic arrangement, rhombohedral for GeTe and cubic for SnTe and PbTe, is visible in the density of phonon states. Vibrational properties are found to be in good agreement with available calculated data and the softer character of the NaCl-type structures in comparison with the rhombohedral GeTe is confirmed.

Mots clés: Chalcogenides; Phonons; Structure; Sound velocity

Domaines: Matériaux

Paula Bauer Pereira, Ilya Sergueev, Stéphane Gorsse, Jayaram Dadda, Eckhard Müller, et al.. Lattice dynamics and structure of GeTe, SnTe and PbTe. physica status solidi (b), 2013, 250 (7), pp.1300-1307. ⟨10.1002/pssb.201248412⟩. ⟨hal-00858187⟩