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, Th, Pepperhoff, W
• Format: Journal Article
• Language: English
• Published: 02.12.1998
• 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 less than or equal to x less than or equal to 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)F 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.