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Title: Phase Transitions and Magnetocaloric Properties in MnCo 1-x Zr x Ge Compounds

The structural, magnetic, and magnetocaloric properties of MnC o 1 - x Z r x Ge ( 0.01 x 0.04 ) have been studied through X-ray diffraction, differential scanning calorimetry, and magnetization measurements. Results indicate that the partial substitution of Zr for Co in MnC o 1 - x Z r x Ge decreases the martensitic transition temperature ( T M ). For x = 0.02, T M was found to coincide with the ferromagnetic transition temperature ( T C ) resulting in a first-order magnetostructural transition (MST). A further increase in zirconium concentration ( x = 0.04) showed a single transition at T C . The MST from the paramagnetic to ferromagnetic state results in magnetic entropy changes ( - Δ S M ) of 7.2 J/kgK for Δ H = 5 T at 274 K for x = 0.02. The corresponding value of the relative cooling power (RCP) was found to be 266 J/kg for Δ H = 5 T. Thus, the observed large value of MCE and RCP makes this system a promising material for magnetic cooling applications.
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [2] ;  [1]
  1. Southern Illinois Univ., Carbondale, IL (United States). Dept. of Physics
  2. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
FG02-06ER46291; FG02-13ER46946
Type:
Published Article
Journal Name:
Advances in Condensed Matter Physics
Additional Journal Information:
Journal Volume: 2017; Journal ID: ISSN 1687-8108
Publisher:
Hindawi
Research Org:
Southern Illinois Univ., Carbondale, IL (United States); Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE
OSTI Identifier:
1363725
Alternate Identifier(s):
OSTI ID: 1430123