Yen Nguyen Hai, Ha Nguyen Hoang, Thanh Pham Thi, Ngoc Nguyen Huy, Thanh Tran Dang, Dan Nguyen Huy
Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, 100000, Viet Nam.
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, 100000, Viet Nam.
J Nanosci Nanotechnol. 2021 Apr 1;21(4):2552-2557. doi: 10.1166/jnn.2021.19099.
In this work, we investigated magnetic properties and magnetocaloric effect in FeCoZrCuB₂ ( = 0, 1, 2, 3 and 4) melt-spun ribbons. The ribbons were prepared by using a melt-spinning method with a tangential velocity of a copper wheel of 40 m·s. The obtained ribbons are almost amorphous. The alloys exhibit typical soft magnetic behavior with low coercivity at room temperature. A minor replacement of Fe by Co gives an increment in Curie temperature () of the alloys to higher temperatures. The of the alloys increases from 242 to 342 K with an increase of from 0 to 4. Maximum magnetic entropy change, Δ , of the alloys, was found to be larger than 0.7 J·kg·K in a magnetic field change Δ of 12 kOe for all the concentrations of Co. High refrigerant capacitys (RC >100 J ·kg with Δ = 12 kOe) at room temperature region have been obtained for the alloys. The large magnetocaloric effect near room temperature suggests that the alloys can be considered as magnetic refrigerants in the range of 250-350 K.
在本工作中，我们研究了FeCoZrCuB₂（= 0、1、2、3和4）熔纺带材的磁性和磁热效应。这些带材采用熔纺法制备，铜轮的切向速度为40 m·s。所获得的带材几乎为非晶态。这些合金在室温下表现出典型的软磁行为，矫顽力较低。用Co少量替代Fe会使合金的居里温度（）升高到更高温度。随着从0增加到4，合金的居里温度从242 K增加到342 K。对于所有Co浓度的合金，在磁场变化Δ为12 kOe时，发现合金的最大磁熵变Δ大于0.7 J·kg·K。在室温区域，这些合金获得了高制冷量（在Δ = 12 kOe时RC >100 J·kg）。室温附近的大磁热效应表明，这些合金在250 - 350 K范围内可被视为磁制冷剂。
