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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.