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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:818

Article

Duc, N. T. M.^1,2,3  Shen, H. X.^1,4  Thiabgoh, O.⁵  Huong, N. T.²  Sun, J. F.⁴  Phan, M. H.¹ 

[1] Univ S Florida, Dept Phys, Tampa, FL 33620 USA

[2] VNU Univ Sci, Dept Phys, 334 Nguyen Trai, Hanoi, Vietnam

[3] Univ Sci & Educ, Univ Danang, 459 Ton Duc Thang, Danang, Vietnam

[4] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

[5] Ubon Ratchathani Univ, Fac Sci, Dept Phys, Ubon Ratchathani 34190, Thailand

关键词: Melt-extraction;    Magnetic microwires;    Magnetocaloric effect;    Magnetic refrigeration;   

DOI  :  10.1016/j.jallcom.2019.153333

来源: Elsevier

【 摘 要 】

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 (similar to 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 Delta S-M similar to 6.4 J kg(-1) K-1 at similar to 120 K, a large temperature interval delta T-FWHM similar to 130 K, and the large refrigerant capacity RC similar to 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. (C) 2019 Elsevier B.V. All rights reserved.

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