Publication Date

3-6-2019

Department

Ames Laboratory

Campus Units

Ames Laboratory

OSTI ID+

1499026

Report Number

IS-J 9915

DOI

10.1016/j.jmmm.2019.03.026

Journal Title

Journal of Magnetism and Magnetic Materials

Volume Number

481

First Page

262

Last Page

267

Abstract

Systematic trends connect detailed composition, lattice parameters and magnetic transition temperatures in the ferromagnetic intermetallic compound AlT2X2 with the Mn2AlB2-type crystal structure, where T = Mn, Fe, Ni, Co and X = B, C. Data were derived from both literature reports and from experiments performed on synthesized samples (T = (Fe1−xNix)2, x = 0, 0.05, 0.1; X = (B0.9C0.1)2). It is observed that compositional variation alters specific bonds responsible for the magnetic phase transition response, which ranges from 200 K ≤ Tt ≤ 310 K. Elemental composition that provides changes in the c-axis length and the associated (T-T)c-axis interatomic distance contribute the largest bonding effects to magnetic phase transition temperature Tt, alterations. Overall, these results are attributed to the dependence of Tt on the specifics of the Fe sublattice occupancy, electronic state and T-T bonding. In contrast, Tt is found to be largely independent of the (b/a) axial ratios and the associated (T-X)b-axis/(T-X)(ac)-plane interatomic distance ratios, indicating that interatomic interactions along the a-axis have little effect on the Tt.

DOE Contract Number(s)

AR0000754; AC02-07CH11358

Language

en

Department of Energy Subject Categories

36 MATERIALS SCIENCE

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Friday, March 06, 2020

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