• DocumentCode
    789325
  • Title

    Structural and magnetic properties of rhombohedral Sm2(Co,Fe,Cr)17Bx and Sm2(Co,Fe,Mn)17Bx compounds

  • Author

    Makridis, Sofoklis S. ; Litsardakis, George ; Efthimiadis, Kostas G. ; Pavlidou, Eleni ; Panagiotopoulos, Ioannis ; Hadjipanayis, George C. ; Niarchos, Dimitris

  • Author_Institution
    Dept. of Electr. & Comput. Eng., Aristotle Univ., Thessaloniki, Greece
  • Volume
    39
  • Issue
    5
  • fYear
    2003
  • Firstpage
    2872
  • Lastpage
    2874
  • Abstract
    Single-phase rhombohedral Sm2(CobalFe0.2My)17Bx with M = Cr or Mn substituting for Co have been prepared and the influence of transition metals on crystal structure, anisotropy field, and Curie temperature is examined. Sm2Co17 as-cast bulk sample has the 2 : 17 hexagonal structure (type Th2Ni17), while boron addition stabilizes the 2 : 17 rhombohedral structure (type Th2Zn17). Anisotropy field for Cr-doped as-cast sample is 74 kOe. Secondary phases of fcc-Co or Fe-Co are observed in some cases. A Cr-doped sample with y = 0.1 after annealing at 1190°C for 26 h is single phase. Curie temperatures of as-cast samples vary from ∼849°C to ∼687°C depending on the composition. Mechanical alloying and melt spinning were used to develop coercivity. As-spun ribbons at 53 m/s with Cr present a nanocomposite structure with Hc = 5.2 kOe. Samples with Mn have a coercive field close to 0.4 kOe. Scanning electron microscopy studies show different microstructure for Mn and Cr substituted ribbon samples.
  • Keywords
    Curie temperature; annealing; boron alloys; chromium alloys; cobalt alloys; coercive force; crystal microstructure; crystal structure; crystal symmetry; ferromagnetic materials; iron alloys; manganese alloys; mechanical alloying; melt spinning; permanent magnets; samarium alloys; scanning electron microscopy; 1190 degC; 26 h; 849 to 687 degC; Curie temperature; Sm2(Co,Fe,Mn)17Bx; Sm2(CoFeCr)17Bx; Sm2(CoFeMn)17Bx; anisotropy field; annealing; coercivity, scanning electron microscopy; crystal; hexagonal structure; magnetic properties; mechanical alloying; melt spinning; rhombohedral Sm2(Co,Fe,Cr)17Bx; structural properties; Alloying; Anisotropic magnetoresistance; Annealing; Boron; Chromium; Iron; Magnetic properties; Spinning; Temperature dependence; Zinc;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/TMAG.2003.815732
  • Filename
    1233244
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=789325