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First-order magneto-structural transition and magnetocaloric effect in Mn(Co0.96Fe0.04)Ge

Journal Article


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Abstract


  • The magnetic properties and magnetic structure of an as-prepared Mn(Co0.96Fe0.04)Ge sample has been investigated by powder neutron diffraction as well as X-ray diffraction and magnetisation measurements. The sample has a ferromagnetic structure in the low-temperature orthorhombic phase and a magneto-structural transition at 299 (1) K to the high-temperature paramagnetic hexagonal phase. This transition occurs at a higher temperature than for as-prepared (Mn0.96Fe0.04)CoGe (TM = 239 (1) K). Increased occupancy by Fe of the Co (4c) site rather than the Mn (4c) site results in this smaller suppression of the structural transition temperature away from that of undoped MnCoGe. It was found that chemical pressure increased the Curie temperature View the MathML sourceTCorth in the orthorhombic phase from 355 (5) K in Mn(Co0.96Fe0.04)Ge to 379 (6) K in MnCoGe. Mn(Co0.96Fe0.04)Ge exhibits a large magnetocaloric effect around the magneto-structural transition, View the MathML source−ΔSmpeak = 11 (2) J kg−1 K−1 and RC = 187 (30) J kg−1 with μ0ΔH = 5 T. The magneto-structural transition is a first order transition as demonstrated by master curve analysis.

Authors


  •   Ren, Qing Yon (external author)
  •   Hutchison, Wayne D. (external author)
  •   Wang, Jian Li.
  •   Studer, Andrew J. (external author)
  •   Campbell, Stewart J. (external author)

Publication Date


  • 2017

Citation


  • Ren, Q. Y., Hutchison, W. D., Wang, J. L., Studer, A. J. & Campbell, S. J. (2017). First-order magneto-structural transition and magnetocaloric effect in Mn(Co0.96Fe0.04)Ge. Journal of Alloys and Compounds, 693 32-39.

Scopus Eid


  • 2-s2.0-84988579215

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3378&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2355

Number Of Pages


  • 7

Start Page


  • 32

End Page


  • 39

Volume


  • 693

Abstract


  • The magnetic properties and magnetic structure of an as-prepared Mn(Co0.96Fe0.04)Ge sample has been investigated by powder neutron diffraction as well as X-ray diffraction and magnetisation measurements. The sample has a ferromagnetic structure in the low-temperature orthorhombic phase and a magneto-structural transition at 299 (1) K to the high-temperature paramagnetic hexagonal phase. This transition occurs at a higher temperature than for as-prepared (Mn0.96Fe0.04)CoGe (TM = 239 (1) K). Increased occupancy by Fe of the Co (4c) site rather than the Mn (4c) site results in this smaller suppression of the structural transition temperature away from that of undoped MnCoGe. It was found that chemical pressure increased the Curie temperature View the MathML sourceTCorth in the orthorhombic phase from 355 (5) K in Mn(Co0.96Fe0.04)Ge to 379 (6) K in MnCoGe. Mn(Co0.96Fe0.04)Ge exhibits a large magnetocaloric effect around the magneto-structural transition, View the MathML source−ΔSmpeak = 11 (2) J kg−1 K−1 and RC = 187 (30) J kg−1 with μ0ΔH = 5 T. The magneto-structural transition is a first order transition as demonstrated by master curve analysis.

Authors


  •   Ren, Qing Yon (external author)
  •   Hutchison, Wayne D. (external author)
  •   Wang, Jian Li.
  •   Studer, Andrew J. (external author)
  •   Campbell, Stewart J. (external author)

Publication Date


  • 2017

Citation


  • Ren, Q. Y., Hutchison, W. D., Wang, J. L., Studer, A. J. & Campbell, S. J. (2017). First-order magneto-structural transition and magnetocaloric effect in Mn(Co0.96Fe0.04)Ge. Journal of Alloys and Compounds, 693 32-39.

Scopus Eid


  • 2-s2.0-84988579215

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3378&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2355

Number Of Pages


  • 7

Start Page


  • 32

End Page


  • 39

Volume


  • 693