Relation between structure and magnetism of Ti sub x Fe sub 100-x alloys within the C14 Laves-phase stability range

• Published in: Journal of magnetism and magnetic materials Vol. 190; no. 3; pp. 289 - 301
• Main Authors: Wassermann, E F, Rellinghaus, B, Roessel, T H, Pepperhoff, W
• Format: Journal Article
• Language: English
• Published: 01.12.1998
• ISSN: 0304-8853

We report about x-ray and magnetic investigations on polycrystalline alloys with hexagonal C14(MgZn sub 2 ) structure of the system Ti sub x Fe sub 100-x in the concentration range 30.5 < =x < =36.5 around the Laves-phase composition TiFe sub 2 (Ti sub 33.3 Fe sub 66.6 ). Neighboring compositions Fe sub 50 Ti sub 50 (with B2 structure) and Ti sub 15 Fe sub 85 and Ti sub 20 Fe sub 80 (with bcc structure) have also been investigated. From the data we establish a magnetic phase diagram for the C14 range of the system, showing a rather sharp transition from mainly ferromagnetic ordering in the range x < 32 to a mainly antiferromagnetic ordering in the range x > 32. The results can be made plausible microscopically by taking the site dependence of the moments into account. A revised structural equilibrium phase diagram is also given.