Crystal structures and phase relationships in magnetostrictive Tb1-xDyxCo2 system

Author ORCID Identifier

Dennis Brown:https://orcid.org/0000-0002-2200-6329

Publication Title

Journal of Physics Condensed Matter

ISSN

09538984

E-ISSN

43917

Document Type

Article

Abstract

The crystal structures and phase relationships of Tb1-xDyxCo2 alloys with 0 x 1 were investigated by synchrotron-based high-resolution X-ray powder diffraction. Three different crystal structures are observed in the system: All the compositions show cubic structure with space group Fd3m at temperatures above the Curie temperature T C; the Tb-rich side sample shows a rhombohedral structure with space group R3M and the Dy-rich side sample has a tetragonal I41/amd space group. In situ measurements on the intermediate compound Tb0.3Dy0.7Co2 show a rhombohedral to tetragonal structural transition, and the two phases coexist from 99 K to 111 K, where the so-called magnetic morphotropic phase boundary (MPB) is found. The coexisting phases are believed to induce the anomalous magnetostrictive effect in the MPB regime.

Publication Date

1-1-2020

DOI

10.1088/1361-648X/ab5cc9

PubMed ID

31778991

Keywords

Crystal structure, Laves phase, Mpb, Rietveld, Synchrotron

Department

Department of Physics

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