Probing of Local Structure in Laves Compound TbFe 2

Kou, Ronghui; Chang, Tieyan

doi:10.1002/crat.202100246

Probing of Local Structure in Laves Compound TbFe ₂

Journal Article · Fri Aug 12 04:00:00 EDT 2022 · Crystal Research and Technology

DOI:https://doi.org/10.1002/crat.202100246· OSTI ID:1996284

^[1]; Chang, Tieyan ^[2]

College of Mechanical Engineering Shenyang University Shenyang 110044 China
Advanced Photon Source Argonne National Laboratory Lemont IL 60439 USA

Abstract

The Laves compounds Tb _1‐x Dy _x Fe ₂ have attracted much interest due to the giant magnetostriction effect appearing at their morphotropic phase boundary compositions. Although previous studies have established the relationship between the average structure and magnetostrictive properties in these compounds, there is a lack of characterization of their local structures. In this paper, as a first step toward this goal, the evolution of the local structure of the terminal compound (TbFe ₂ ) of this system is reported, in an attempt to provide useful information about interatomic bonding in this system. The pair distribution function (PDF) results suggest that the compound presents the rhombohedral local crystal symmetry. The lattice at the local scale shows abnormal thermal expansion which is different from the long scale structure. The different role of the Tb─Fe bond and Fe─Fe bond in affecting the crystal lattice is revealed. These findings highlight the important role of local structure in determining the magnetostrictive properties of the Laves compounds.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; AC02-06CH11357

OSTI ID:: 1996284

Journal Information:: Crystal Research and Technology, Journal Name: Crystal Research and Technology Journal Issue: 10 Vol. 57; ISSN 0232-1300

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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