Modeling and Characterization of the Magnetocaloric Effect in Ni2MnGa Materials

Conference · Sun Jan 01 00:00:00 EST 2012

DOI:https://doi.org/10.1016/j.ijrefrig.2013.10.001· OSTI ID:1081914

Nicholson, Don M ^[1]; Odbadrakh, Khorgolkhuu ^[1]; Rios, Orlando ^[1]; Hodges, Jason P ^[1]; Ludtka, Gerard Michael ^[1]; Porter, Wallace D ^[1]; Sefat, Athena Safa ^[1]; Rusanu, Aurelian ^[1]; Evans, III, Boyd Mccutchen ^[1]

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1. ORNL

Magnetic shape memory alloys have great promise as magneto-caloric effect refrigerant materials due to their combined magnetic and structural transitions. Computational and experimental research is reported on the Ni2MnGa material system. The magnetic states of this system have been explored using the Wang-Landau statistical approach in conjunction with the Locally Self-consistent Multiple-Scattering (LSMS) method to explore the magnetic states responsible for the magnet-caloric effect in this material. The effects of alloying agents on the transition temperatures of the Ni2MnGa alloy were investigated using differential scanning calorimetry (DSC) and superconducting quantum interference device (SQUID). Neutron scattering experiments were performed to observe the structural and magnetic phase transformations at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) on alloys of Ni-Mn-Ga and Ni-Mn-Ga-Cu-Fe. Data from the observations are discussed in comparison with the computational studies.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Temperature Materials Lab. (HTML); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Center for Computational Sciences (NCCS)
• Sponsoring Organization: USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1081914
• Resource Relation: Journal Volume: 37; Conference: THERMAG V, 5th IIR/IIF International Conference on Magnetic Refrigeration at Room Temperature, Grenoble, France, 20120917, 20120920
• Country of Publication: United States
• Language: English

Related Subjects

magnetocaloric
magnetic refrigeration
neutron scattering
first principles modeling