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Magnetocaloric effect in Mn-rich Heusler-derived alloys for room temperature-based applications

Journal Article · · Journal of Materials Chemistry C
DOI:https://doi.org/10.1039/D4TC04242E· OSTI ID:3021122
 [1];  [1];  [2];  [3];  [4];  [1];  [5];  [1]
  1. Indian Institute of Technology Kharagpur, West Bengal (India)
  2. Indian Institute of Technology Jammu (India)
  3. Southern Illinois University, Carbondale, IL (United States)
  4. Defence Metallurgical Research Laboratory, Hyderabad (India)
  5. Indian Institute of Science, Karnataka (India)
Magnetic refrigeration-based technologies rely on the magnetocaloric properties of materials and are crucial for improving energy efficiency and for supporting clean environments. However, materials possessing significant magnetocaloric properties that can be used for room temperature-based applications are still lacking. Heusler alloys (such as Mn–Ni–Ga) show giant magnetocaloric effects, which can be further improved by tuning their composition. Herein, we optimized the ratio of Ni to Ga to achieve an alloy with unique magnetocaloric properties. Here, the alloy demonstrated a substantial magnetocaloric effect, attributed to its narrow temperature range for structural and magnetic phase transitions (near room temperature with minimal hysteresis). Structural phase changes were also observed through high-resolution transmission electron microscopy. Optimum entropy changes, calculated from isothermal magnetization curves (4 Tesla magnetic field), were found to be 24.50 J kg−1 K−1, which is higher than that of state-of-the-art alloys. Experimental demonstration of the magnetocaloric effect (refrigeration cycle) was also carried out using a thermal imaging camera. Furthermore, first-principles calculations were conducted to validate the experimental findings, specifically focusing on the compositional effects on the structural transitions and magnetic properties of the investigated MNG alloys.
Research Organization:
Southern Illinois University, Carbondale, IL (United States)
Sponsoring Organization:
Asian Office of Aerospace Research and Development; USDOE
Grant/Contract Number:
FG02-06ER46291
Other Award/Contract Number:
FA2386-21-1-4014
OSTI ID:
3021122
Alternate ID(s):
OSTI ID: 2563514
Journal Information:
Journal of Materials Chemistry C, Journal Name: Journal of Materials Chemistry C Journal Issue: 21 Vol. 13; ISSN 2050-7534; ISSN 2050-7526
Publisher:
Royal Society of Chemistry (RSC)Copyright Statement
Country of Publication:
United States
Language:
English

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