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Title: Effects of heat treatments on magneto-structural phase transitions in MnNiSi-FeCoGe alloys

Journal Article · · Intermetallics
 [1];  [1];  [1];  [1];  [2];  [2];  [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Southern Illinois Univ., Carbondale, IL (United States)

A first-order magneto-structural transition from a ferromagnetic orthorhombic TiNiSi-type martensite phase to a paramagnetic hexagonal Ni2In-type austenite phase was observed in (MnNiSi)0.62(FeCoGe)0.38. In this work, we demonstrate that the first-order magneto-structural transition temperature for a given composition is tunable over a wide temperature range through heat treatment and hydrostatic pressure application. The first-order transition temperature decreased by over 150 K as the annealing/quenching temperature went from 700 to 1050 °C. The largest maximum magnetic-field-induced isothermal entropy change with μ0ΔH = 7 T reached -36.2 J/kg-K for the sample quenched at 700 °C, and the largest effective refrigeration capacity reached 344.5 J/kg for the sample quenched at 800 °C. Similar to the influence of annealing temperatures, the first-order martensitic transition temperatures decreased as the applied hydrostatic pressure increased until they were completely converted to second order. Lastly, our results suggest that the class of MnNiSi-based alloys is a promising platform for tailoring working temperature ranges and associated magnetocaloric effects through heat treatment or application of hydrostatic pressure.

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); National Science Foundation (NSF)
Grant/Contract Number:
SC0010521; FG02-06ER46291; FG02-13ER46946; NSF-DMR-1306392
OSTI ID:
1872461
Alternate ID(s):
OSTI ID: 1529686
Journal Information:
Intermetallics, Vol. 112; ISSN 0966-9795
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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