Campus Units

Materials Science and Engineering, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

6-15-2015

Journal or Book Title

Acta Materialia

Volume

92

First Page

18

Last Page

24

DOI

10.1016/j.actamat.2015.03.049

Abstract

Relationships between the electronic structure, magnetostriction, and phase stability of the GdNi1−xCox system have been investigated. Increasing the concentration of Co in GdNi1−xCox (0 ⩽ x < 0.5) series leads to anisotropic changes of lattice parameters within the CrB-type crystal structure which are qualitatively similar to, but are stronger than, those observed upon the application of magnetic field to the Co-free, binary GdNi near its Curie temperature, TC. The magnetic field and temperature dependent X-ray powder diffraction study of GdNi0.85Co0.15 shows that the strong linear thermal expansion effects near TC are, however, absent. Density functional theory calculations show that hypothetical “GdCo” has positive formation energy, and density of states at the Fermi level indicates intrinsic instability of “GdCo” as opposed to GdNi. The enhanced exchange interaction energy of “GdCo” compared to GdNi supports the experimentally observed increasing Curie temperature of GdNi1−xCox with increasing x(Co).

Comments

This is a manuscript of an article published as Mudryk, Y., D. Paudyal, T. Prost, L. S. Chumbley, V. K. Pecharsky, and K. A. Gschneidner Jr. "Correlations between magnetism, microstructure, crystallography, and phase stability in GdNi1− xCox alloys." Acta Materialia 92 (2015): 18-24. DOI: 10.1016/j.actamat.2015.03.049. Posted with permission.

Copyright Owner

Acta Materialia Inc.

Language

en

File Format

application/pdf

Published Version

Included in

Metallurgy Commons

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