Dresden 2011 – wissenschaftliches Programm
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AKE: Arbeitskreis Energie
AKE 10: Wärmepumpen und Kraft-Wärme-Kopplung
AKE 10.2: Vortrag
Mittwoch, 16. März 2011, 15:00–15:15, BEY 118
Experimental and theoretical studies of the Magnetocaloric Effect (MCE) in the Mn5-xFexSi3 series — •Michael Gottschlich1, Olivier Gourdon2, Michael Ohl2, Thomas Brückel1, and Jörg Perßon1 — 1Research Center Jülich, Germany — 2JCNS Outstationed at the SNS at Oak Ridge National Laboratory, USA
The magnetocaloric effect (MCE) based on entropy changes of magnetic materials in an applied magnetic field, holds the potential of applications for refrigeration without moving mechanical parts. Therefore it has recently attracted the attention of many scientific research groups. Although MCE was discovered a long time ago (1881) by Warburg in iron, practically usable materials of low cost which are chemically stable and safe are still being researched. Recently, after the characterization concerning magnetization measurements and refinements on x-ray data, neutron measurements on polycristalline samples Mn5-xFexSi3 have been collected on the POWGEN neutron powder diffractometer at SNS. These preliminary measurements emphasize a unique atomic distribution as well as a ferromagnetic ordering along the c axis. Such effect is certainly directly linked to the MCE measured. Preliminary theoretical calculations which support our findings will also be presented.