Regensburg 2002 – wissenschaftliches Programm

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MA: Magnetismus

MA 10: Poster : Dünne Schichten(1-21),Spinabh.Transp.(22-39),Exch.Bias(40-51),Spindyn.(52-55),Mikromag.(56-66),Partikel(67-74),Abb.Verf.(75-77),Oberfl.+Spinelektr.+Elektr.Theo+Mikromag(75-87),PÜ+Aniso+Werkst/Leg.(88-103),Mol.Mag.+N-dim+Messm.+Postdead(104-111

MA 10.93: Poster

Dienstag, 12. März 2002, 15:00–19:00, Bereich A

Crystal structure and magnetic properties of NdFe_12−x−yTi_xNb_y alloys — •J.  Hesse³, K. G.  Efthimiadis¹, S. C.  Chadjivasiliou¹, A. K.  Sianou¹, I. A.  Tsoukalas¹, G.  Litardakis² und H.  Bremers³ — ¹Aristotle University, Department of Physics, GR 54006 Thessaloniki, Greece — ²Aristotle University, Department of Electrical and Computer Engineering, GR 54006 Thessaloniki, Greece — ³Institut für Metallphysik und Nukleare Festkörperphysik TU, 38106 Braunschweig, Mendelssohnstr. 3

A series of NdFe_12−x−yTi_xNb_y (0.6≤ x+y ≤ 1.1) alloys was prepared by arc melting followed by annealing at temperatures 950^∘C, 1050^∘C and 1150^∘C and water quenching. X-ray diffraction and magnetization measurements showed crystalline phases of ThMn₁₂ (1:12), Th₂Zn₁₇ (2:17) and Nd₃(Fe,Ti)₂₉ (3:29) structure types, as well as bcc–Fe and Fe₂(Ti,Nb) crystalline phases. The volume fraction of the intermetallic compounds rises with the increasing of the anneaeling temperature. The 1:12 structure type is formed in alloys with p_Nb=y/(x+y)≤ 0.3; as the Nb participation in the stabilizing agent increases (0.3 < p_Nb≤ 0.5), the 3:29 structure type is the dominant one, while for higher participations (p_Nb > 0.5) the 2:17 structure type is observed.