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Title: Influence of copper substitution on the magnetic and magnetocaloric properties of NiMnInB alloys

The structural, magnetocaloric, and thermomagnetic properties of Ni{sub 50.51}Mn{sub 34.34−x}Cu{sub x}In{sub 14.14}B{sub 1.01} with x = (0, 1.26, and 2.02) have been studied using room-temperature x-ray diffraction, differential scanning calorimetry (DSC), and magnetization measurements. The partial substitution of Cu for Mn was found to shift both the martensitic transition temperature (T{sub M}) and the Curie temperature (T{sub C}) to lower temperatures. The values of the latent heat (L = 9.4 J/g) and corresponding magnetic (ΔS{sub M}) and total entropy (ΔS{sub T}) changes (ΔS{sub M} = 22.60 J/kg K for ΔH = 5 T and ΔS{sub T} = 29.7 J/kg K) have been evaluated using magnetic and DSC measurements, respectively, for the sample with x = 1.26. Large negative values of ΔS{sub M} of −7.27 and −5.98 J/kg K for ΔH = 5 T in the vicinity of T{sub C} were observed for x = 1.26 and 2.02, respectively. It has been found that the application of hydrostatic pressure changes the magnetic ground state of the martensitic phase and increases the temperature stability of the martensitic phase. The roles of the magnetic and structural changes on the transition temperatures are discussed.
Authors:
; ; ; ;  [1] ; ;  [2]
  1. Department of Physics, Southern Illinois University, Carbondale, Illinois 62901 (United States)
  2. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803 (United States)
Publication Date:
OSTI Identifier:
22409930
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; CALORIMETRY; COPPER; COPPER ALLOYS; CURIE POINT; DIFFERENTIAL THERMAL ANALYSIS; ENTROPY; GROUND STATES; INDIUM ALLOYS; MAGNETIZATION; MANGANESE ALLOYS; MARTENSITIC STEELS; NICKEL BASE ALLOYS; PHASE STABILITY; PHASE STUDIES; PHASE TRANSFORMATIONS; TEMPERATURE RANGE 0273-0400 K; THERMOMAGNETISM; X-RAY DIFFRACTION