Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 15: Poster Session
MM 15.63: Poster
Montag, 11. März 2013, 18:00–20:00, Poster E
Crystal growth and characterization of Ba8Ni3.5Ge42.10.4 — •Stephan Pohl, Céline Grimm-Allio, Carola Dietrich, Klaus-Dieter Luther, Franz Ritter, Wolf Assmus, and Cornelius Krellner — Physikalisches Institut, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany
The clathrate Ba8Ni3.5Ge42.10.4 possesses interesting thermoelectric properties [1]. On the one hand it features a high electric conductivity, on the other hand it has a low thermal conductivity. These properties are due to the specific crystal structure with Ba guest atoms in a Ni-Ge host lattice and might be promising towards technical applications. Neutron scattering techniques are well suited to investigate the phonon dispersions to unravel the underlying microscopic origin of the thermoelectric characteristics. However, large single crystals are required for that kind of research. Here, we show that the crystal growth of Ba8Ni3.5Ge42.10.4 can be achieved by the crucible-free Czochralski pulling method. We particularly present the crystal growing achievements with a tungsten single crystal as a seed and the results of x-ray investigations on the obtained single crystals.
[1] L. T. K. Nguyen et al., Dalton Trans. 39, 1071 (2010).