Magnetocaloric properties of rapidly solidified Dy{sub 3}Co alloy ribbons

Journal Article · Thu May 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4906764· OSTI ID:22403039

Flores-Zúñiga, H.; Sánchez-Valdés, C. F. ^[1]; Álvarez-Alonso, Pablo ^[2]; Lara Rodríguez, G. A. ^[3]; Fernández-Gubieda, M. L. ^[2]

---

1. Instituto Potosino de Investigación Científica y Tecnológica A.C., Camino a la Presa San José 2055 Col. Lomas 4"a, San Luis Potosí, S.L.P. 78216 (Mexico)
2. Departamento de Electricidad y Electrónica, UPV/EHU, 48940 Leioa (Spain)
3. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, México, D. F. 04510 (Mexico)

The magnetic and magnetocaloric (MC) properties of melt-spun ribbons of the Dy{sub 3}Co intermetallic compound were investigated. Samples were fabricated in an Ar environment using a homemade melt spinner system at a linear speed of the rotating copper wheel of 40 ms{sup −1}. X-ray diffraction analysis shows that ribbons crystallize into a single-phase with the Fe{sub 3}C-type orthorhombic crystal structure. The M(T) curve measured at 5 mT reveals the occurrence of a transition at 32 K from a first to a second antiferromagnetic (AFM) state and an AFM-to-paramagnetic transition at T{sub N} = 43 K. Furthermore, a metamagnetic transition is observed below T{sub N}, but the magnetization change ΔM is well below the one reported for bulk alloys. Below 12 K, large inverse MC effect and hysteresis losses are observed. This behavior is related to the metamagnetic transition. For a magnetic field change of 5 T (2 T) applied along the ribbon length, the produced ribbons show a peak value of the magnetic entropy change ΔS{sub M}{sup peak} of −6.5 (− 2.1) Jkg{sup −1}K{sup −1} occurring close to T{sub N} with a full-width at half-maximum δT{sub FWHM} of 53 (37) K, and refrigerant capacity RC = 364 (83) Jkg{sup −1} (estimated from the product |ΔS{sub M}{sup peak}| × δT{sub FWHM})

• OSTI ID: 22403039
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTIFERROMAGNETISM
ATOMIC FORCE MICROSCOPY
COPPER
DYSPROSIUM
ENTROPY
HYSTERESIS
INTERMETALLIC COMPOUNDS
IRON CARBIDES
MAGNETIC FIELDS
MAGNETIZATION
ORTHORHOMBIC LATTICES
PARAMAGNETISM
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
REFRIGERANTS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION