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 Magnetocaloric microwires for energy efficiency magnetics refrigeration
Tác giả hoặc Nhóm tác giả: N.T.M. Duc, H.X. Shen, E. Clements, N.T. Huong, H. Srikanth, and M.H. Phan
Nơi đăng: Hanoi International Symposium on Advanced Materials and Devices (HISAMD 2019), January 10-12, 2019, Hanoi, Vietnam; Số: P17-AMD;Từ->đến trang: 72;Năm: 2019
Lĩnh vực: Khoa học công nghệ; Loại: Báo cáo; Thể loại: Quốc tế
TÓM TẮT
Magnetic refrigeration based on the magnetocaloric effect (MCE) has enabled a future green cooling technology. There are many factors that determine the cooling efficiency; one of which is the dimesion of the magnetic refrigerant used. While shaping magnetic refrigerants in the form of spherical or irregular particles is energy-inefficient, the use of the wires with increased surface areas allows for a higher heat transfer between the magnetic refrigerant and surrounding liquid. In this paper, we report on the structural, magnetic, and magnetocaloric properties of some high-quality Gd-based alloy microwires systems with an average diameter of ~40 μm, which were fabricated by the melt-extraction method. In the first system, the high-quality Gd60Fe20Al20 microwires, magnetization measurements revealed a broad paramagnetic to ferromagnetic phase transition at TC ~ 202 K. For μ0ΔH = 5T, the microwires exhibit a broad magnetic entropy change with its maximum value ΔSMmax of ~4.8 J kg-1 K-1 and a large refrigerant capacity (RC) of ~ 687 J kg-1 over a large temperature interval (150 K). In the second system, the high-quality amorphous Gd50(Co69.25Fe4.25Si13B13.5)50 microwires undergo a second-order paramagnetic to ferromagnetic (PM-FM) transition around the Curie temperature, TC ~173 K. Around the PM-FM phase transition temperature, the magnetic entropy change reaches a maximum value ΔSMmax of about 5.92 J/kg K for μ0ΔH = 5T. The critical behaviors near the PM-FM phase transition are discussed.
ABSTRACT
Magnetic refrigeration based on the magnetocaloric effect (MCE) has enabled a future green cooling technology. There are many factors that determine the cooling efficiency; one of which is the dimesion of the magnetic refrigerant used. While shaping magnetic refrigerants in the form of spherical or irregular particles is energy-inefficient, the use of the wires with increased surface areas allows for a higher heat transfer between the magnetic refrigerant and surrounding liquid. In this paper, we report on the structural, magnetic, and magnetocaloric properties of some high-quality Gd-based alloy microwires systems with an average diameter of ~40 μm, which were fabricated by the melt-extraction method. In the first system, the high-quality Gd60Fe20Al20 microwires, magnetization measurements revealed a broad paramagnetic to ferromagnetic phase transition at TC ~ 202 K. For μ0ΔH = 5T, the microwires exhibit a broad magnetic entropy change with its maximum value ΔSMmax of ~4.8 J kg-1 K-1 and a large refrigerant capacity (RC) of ~ 687 J kg-1 over a large temperature interval (150 K). In the second system, the high-quality amorphous Gd50(Co69.25Fe4.25Si13B13.5)50 microwires undergo a second-order paramagnetic to ferromagnetic (PM-FM) transition around the Curie temperature, TC ~173 K. Around the PM-FM phase transition temperature, the magnetic entropy change reaches a maximum value ΔSMmax of about 5.92 J/kg K for μ0ΔH = 5T. The critical behaviors near the PM-FM phase transition are discussed.
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