Moment instabilities and structural phase transitions in 3d-alloys

• Published in: Journal of magnetism and magnetic materials Vol. 90; pp. 126 - 130
• Main Authors: Wassermann, E.F., Acet, M., Pepperhoff, W.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.12.1990; Elsevier Science
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic properties and materials; Metals. Metallurgy; Physics
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(10)80041-1

Systematics in magnetovolume behavior of fcc 3d-alloys are revealed when their respective physical properties are plotted versus the electron concentration e/a. The results can qualitatively be understood within recent band calculations, showing metamagnetism to occur at threshold values e/a ≈ 8.6 and ≈ 7.7, when the alloys order ferromagnetically and antiferromagnetically, respectively. From the e/a dependence of martensite transition temperatures, M s, we infer that the structural fec-fet (or fcc-bcc) phase transition's occurring just below the e/a thresholds are magnetically driven, and show that martensitic transformations can be explained by using the results of the band calculations mentioned above. Similarity to structural transformations in non-magnetic Hume-Rothery alloys is discussed.