Magnetic, Magnetocaloric, and Critical Properties of Fe 84-x Cr 2+x B 2 Co 2 Zr 10 Melt-Spun Ribbons
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ORIGINAL PAPER
Magnetic, Magnetocaloric, and Critical Properties of Fe84-xCr2+xB2Co2Zr10 Melt-Spun Ribbons Nguyen Hai Yen 1,2
&
Nguyen Hoang Ha 2,3 & Pham Thi Thanh 1,2 & Tran Dang Thanh 1,2 & Nguyen Huy Dan 1,2
Received: 10 April 2020 / Accepted: 6 July 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Magnetic properties, magnetocaloric effect, and critical behavior of Fe84-xCr2+xB2Co2Zr10 (x = 1, 2, 3, 4, 5, and 6) rapidly quenched alloy ribbons prepared by melt-spinning method have been investigated. X-ray diffraction analysis shows that the ribbons are almost amorphous. All the ribbons exhibit soft magnetic behavior with a low coercivity, Hc < 20 Oe. The magnetic phase transition temperature of the alloy can be adjusted in the room temperature region by appropriate Cr concentrations. With increasing Cr concentration, Curie temperature (TC) of the alloys is reduced from 330 K (for x = 1) to 290 K (for x = 6). The quite high maximum magnetic entropy change, |ΔSm|max > 0.8 J.kg−1.K−1 (under a magnetic field change of 12 kOe), and the wide working temperature range, δT > 90 K, around room temperature, have been achieved on these alloy ribbons. The obtained results reveal that Fe84-xCr2+xB2Co2Zr10 alloys are potential candidates for the magnetic refrigerants at room temperature region. Using the Arrott-Noakes method, critical analyses around the ferromagnetic-paramagnetic phase transition elucidated the magnetic orders in the alloys. The critical parameters determined for Fe84-xCr2+xB2Co2Zr10 ribbons are close to those of the mean-field theory applied for the long-range ferromagnetic orders. Keywords Magnetocaloric effect . Magnetic entropy change . Magnetic refrigerant . Critical parameters . Melt-spinning method
1 Introduction The magnetocaloric effect (MCE) is defined as the temperature change of a magnetic material associated with an external magnetic field change in an adiabatic process. This effect was discovered a long time ago and practically applied to refrigeration techniques at extremely low temperatures (down to microKelvin) [1]. However, the magnetocaloric materials have been really focused recently due to their possibility for magnetic refrigeration at room temperature [2–5]. This technology has a high cooling efficiency (saving energy) and does
* Nguyen Hai Yen [email protected] 1
Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
2
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
3
Lam Son Gifted High School, 307 Le Lai, Dong Son, Thanh Hoa, Vietnam
not cause environmental pollution. The magnetic refrigeration bases on the principle of the magnetic entropy change (ΔSm) of material. To have high magnetic cooling efficiency, the MCE of the magnetic material should be large (large ΔSm) with a low magnetic field change. Up to now, a number of the magnetic materials having large MCE have been discovere
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