Effects of Rare-Earth (R = Pr, Gd, Ho, Er) Doping on Magnetostructural Phase Transitions and Magnetocaloric Properties in Ni43–xRxMn46Sn11 Shape Memory Alloys
- Southern Illinois Univ., Carbondale, IL (United States)
- Louisiana State Univ., Baton Rouge, LA (United States)
A series of rare-earth-doped Ni43-xRxMn46Sn11 (x = 0, 1 and R = Pr, Gd, Ho, Er) alloys was fabricated by arc melting, and their structural, magnetic, and magnetocaloric properties were studied through room temperature X-ray diffraction (XRD), differential scanning calorimetry, and magnetization measurements. Analysis of XRD data reveal that the alloys crystallize in the cubic L21 austenite phase structure as the major phase with a small trace of martensitic phase (MP). The martensitic transition temperature (TM) shifts to consecutive higher temperatures with the substitution of Pr, Gd, Ho, and Er. A drastic shift in TM by ~60 K relative to the parent compound (TM = 195 K) was found for Ni42PrMn46Sn11. Large values of magnetic entropy changes (ASM) of 32 (Pr), 28 (Gd), and 25 J · kg-1 · K-1 (Ho) were obtained at TM for ΔH = 50 kOe. A maximum value of the refrigeration capacity of ~250 J · kg-1 was obtained in the vicinity of TM for ΔH = 50 kOe for the Ho-doped compound. Furthermore, a large exchange bias effect with HEB~ 1.1 kOe at 10 K was observed for the Pr-doped compound in its MP.
- Research Organization:
- Louisiana State Univ., Baton Rouge, LA (United States); Southern Illinois Univ., Carbondale, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- Grant/Contract Number:
- FG02-13ER46946; SC0010521
- OSTI ID:
- 1872888
- Journal Information:
- IEEE Transactions on Magnetics, Vol. 55, Issue 2; ISSN 0018-9464
- Publisher:
- Institute of Electrical and Electronics Engineers. Magnetics GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Magnetic field dependence of the martensitic transition and magnetocaloric effects in Ni 49 BiMn 35 In 15
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journal | January 2020 |
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75 CONDENSED MATTER PHYSICS
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magnetocaloric effect
phase transitions
shape-memory alloys
exchange bias
magnetocaloric
magnetoresistance
magnetostructural transitions
rare-earth doped Heusler alloys