Magnetic and Magnetocaloric Properties of ( Nd1-xCex)YFe15 Alloys

ORAL

Abstract

Magnetocaloric materials exhibiting a second-order phase transition (SOPT) near room temperature have attracted much attention because these materials are free from magnetic and thermal hysteresis, and may show large cooling efficiency and moderate magnetic entropy change. We have investigated (Nd1-xCex)YFe15 (x = 0 - 1) alloys prepared by arc melting and vacuum annealing. The x-ray diffraction patterns analyzed using the Rietveld method shows that the samples crystallized in the rhombohedral Th2Zn17-type structure with space group R-3m. The thermomagnetic curves M(T) measured at μ0H = 1T show smooth SOPT with Curie temperatures near 300 K. The values of peak magnetic entropy change (ΔSM,max) and relative cooling power (RCP) measured at 3 T increase with increasing Nd concentration reaching 4.20 Jkg-1K-1 and 285 Jkg-1 for (Nd0.7Ce0.3)YFe15. The measured ΔSM and RCP values are relatively high as compared to those of other Gd-free compounds showing magnetocaloric effect due to SOFT near room temperature. This suggests that the (Nd1-xCex)YFe15 alloys have potential for room temperature magnetic refrigeration.

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Presenters

  • Parashu Kharel

    Physics, South Dakota State University, South Dakota State University

Authors

  • Bishnu Dahal

    Physics, South Dakota State University

  • Parashu Kharel

    Physics, South Dakota State University, South Dakota State University

  • Thomas Ott

    Physics, South Dakota State University

  • Wenyong Zhnag

    Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA, Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, United States

  • Shah Valloppilly

    Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, United States

  • Yung Moo Huh

    Physics, South Dakota State University

  • Ralph Skomski

    Physics & Astronomy, University of Nebraska, Lincoln, Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, United States

  • David Sellmyer

    Physics & Astronomy, University of Nebraska, Lincoln, Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA, University of Nebraska - Lincoln, Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, United States