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Melt-extracted Gd73.5Si13B13.5/GdB6 ferromagnetic/antiferromagnetic microwires with excellent magnetocaloric properties

Journal Article · · Journal of Alloys and Compounds
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of South Florida, Tampa, FL (United States); VNU Univ. of Science, Hanoi (Vietnam); Univ. of Danang (Vietnam); OSTI
  2. Univ. of South Florida, Tampa, FL (United States); Harbin Institute of Technology (China)
  3. Ubon Ratchathani Univ. (Thailand)
  4. VNU Univ. of Science, Hanoi (Vietnam)
  5. Harbin Institute of Technology (China)
  6. Univ. of South Florida, Tampa, FL (United States)
A novel class of magnetocaloric microwires composed of antiferromagnetic GdB6 nanocrystals embedded in an amorphous ferromagnetic Gd73.5Si13B13.5 matrix is reported. These composite microwires were created directly from a melt-extraction process. XRD, TEM, HRTEM and SAED confirm the formation of GdB6 nanocrystals (~10 nm) in the amorphous Gd73.5Si13B13.5 matrix. As a second-order magnetic material, the Gd73.5Si13B13.5/GdB6 microwires exhibit an excellent magnetocaloric response, with a large magnetic entropy change ΔSM ~6.4 J kg-1 K-1 at ~120 K, a large temperature interval δTFWHM ~130 K, and the large refrigerant capacity RC ~890 J kg-1 for a field change of 5 T. Such microwires are a promising candidate for active magnetic refrigeration in the temperature range of 10–200 K.
Research Organization:
Univ. of South Florida, Tampa, FL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER46438
OSTI ID:
1800498
Alternate ID(s):
OSTI ID: 1579434
Journal Information:
Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 818; ISSN 0925-8388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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