Abstract:
:Magnetic refrigeration is of great interest due to its high energy efficiency, environmental friendliness and low cost. However, undesired hysteresis losses, concentrated working temperature interval (WTI) and poor mechanical stability are vital drawbacks that hinder its practical application. Off-stoichiometric Ni-Mn-Ga Heusler alloys are capable of giant magnetocaloric effect (MCE) and tunable transformation temperatures. Here, by creating Ni-Mn-Ga microwires with diameter of 35-80 μm using a melt-extraction technique, negligible hysteresis and relatively good mechanical stability are found due to the high specific surface area (SSA) that reduces incompatibility between neighboring grains. The high SSA also favors the element evaporation at high temperatures so that the transformation temperatures can be feasibly adjusted. Tunable magnetocaloric effect owing to different magneto-structural coupling states is realized by (i) composition design and subsequent tuning, which adjusts the temperature difference between the martensite transformation (MT) and the magnetic transition, and (ii) creation of gradient composition distribution state, which manipulates the MT range. Magnetic entropy change ΔSm ~-18.5 J kg-1 K-1 with relatively concentrated WTI and WTI up to ~60 K with net refrigeration capacity ~240 J kg-1 at 50 kOe are demonstrated in the present Ni-Mn-Ga microwires. This criterion is also applicable for other small-sized materials.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Qian M,Zhang X,Wei L,Martin P,Sun J,Geng L,Scott TB,Peng HXdoi
10.1038/s41598-018-35028-9subject
Has Abstractpub_date
2018-11-08 00:00:00pages
16574issue
1issn
2045-2322pii
10.1038/s41598-018-35028-9journal_volume
8pub_type
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