Details

Autor(en) / Beteiligte

• Skoug, Eric J.
• Meyer, M.S.
• Pinkerton, F.E.
• Tessema, Misle M.
• Haddad, Daad
• Herbst, J.F.

Titel

Crystal structure and magnetic properties of Ce2Fe14−xCoxB alloys

Ist Teil von

• Journal of alloys and compounds, 2013-10, Vol.574, p.552-555

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2013

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •Annealed melt-spun Ce3Fe14−xCoxB or Ce2.55Fe14−xCoxB1.27 ribbons maintain the Ce2Fe14B crystal structure only for x⩽5.•In contrast to many other R2Fe14B materials, we find no evidence for the formation of Ce2Co14B.•The Curie temperature increases rapidly with increasing cobalt content x, reaching ∼660K for x=5.•Ce3Fe12Co2B offers significant improvement in Tc, Br, and (BH)max relative to its Co-free analog with only modest Hci loss. Permanent magnet materials based on the R2Fe14B phase (R=rare earth element) are essential to a wide variety of applications, among them automotive traction motors. Current state-of-the-art materials rely on R=Nd and Dy, for both of which there are supply uncertainties and rapidly rising costs. A possible alternative is R=Ce, the most abundant rare earth, but Ce2Fe14B has several disadvantages, including a low Curie temperature (Tc) that limits its maximum operating point to well below that required for some automotive uses. Here we systematically investigate the Ce2Fe14−xCoxB system by exploring Co substitution for Fe in melt-spun ribbons as a means of increasing Tc. In addition to Tc we report the solubility of Co in Ce2Fe14B and its effect on the crystal structure and hard magnetic properties.