Abstract
We report the pressure (P) dependent Curie temperature, Tc (P) in a FeCoNiCuMn high entropy alloy (HEA). We analyze Tc (P) in terms of d-orbital contraction to explain changes in magnetic exchange interactions (Jex). Considerations of the d-radius contraction inferred from the composition dependence of Tc in γ-Fe-Ni are combined with experimental data for P-dependent lattice constants and magnetic measurements of Tc (P), to calculate contributions of atomic spacing and d-orbital radii to Jex. We show the d-orbital contraction with P captures most of the Tc variation in this alloy.
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Acknowledgements
The authors acknowledge support from the National Science Foundation (NSF) through Grant DMR-1709247. The authors also acknowledge use of the Data Storage Systems Center at CMU. We thank Alex Leary at NASA Glenn Space Center for measurement assistance. Work at LLNL prepared under Contract DE-AC52-07NA27344 and was supported by the LLNL-LDRD Program under Project No. 20-ER-059.
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This article is part of a special topical focus in the Journal of Phase Equilibria and Diffusion on the Thermodynamics and Kinetics of High-Entropy Alloys. This issue was organized by Dr. Michael Gao, National Energy Technology Laboratory; Dr. Ursula Kattner, NIST; Prof. Raymundo Arroyave, Texas A&M University; and the late Dr. John Morral, The Ohio State University.
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Perrin, A., McCall, S., McElfresh, M. et al. Understanding Magnetic Exchange Interactions by the Pressure Dependent Curie Temperature in FeCoNiCuMn High Entropy Alloys. J. Phase Equilib. Diffus. 42, 617–622 (2021). https://doi.org/10.1007/s11669-021-00920-x
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DOI: https://doi.org/10.1007/s11669-021-00920-x