Effect of aluminum substitution and rare-earth content on the structure of R2(Fe1-xAlx)17 (R=Tb, Dy, Ho, Er) phases

Yanson, T.; Manyako, M.; Bodak, O.; Cerny, Radovan; Yvon, Klaus

doi:10.1016/S0925-8388(01)00930-6

Scientific article

English

Effect of aluminum substitution and rare-earth content on the structure of R₂(Fe_1-xAl_x)₁₇ (R=Tb, Dy, Ho, Er) phases

Contributors

Yanson, T.; Manyako, M.; Bodak, O.; Cerny, Radovan; Yvon, Klaus

Published in

Journal of alloys and compounds, vol. 320, p. 108-113

Publication date

2001

Abstract

The phase equilibria in the iron rich parts of the R–Fe–Al (R=Tb, Dy, Ho, Er) phase diagrams at 500°C have been studied by X-ray powder diffraction analysis. As the aluminum contents in the series R2 (Fe1-x Alx)17 are increased the hexagonal Th2Ni17 type structure (or a substitution derivative of that structure) transforms — usually via a hexagonal TbCu type derivative structure — into the rhombohedral Th2Zn17 type structure (or a substitution derivative of that structure). The hexagonal structures dominate at or below the 2 17 molar ratio R/(Fe,Al)52/17 (10.5 and 9.5 at.% R), while the rhombohedral structure dominates at higher R contents (11.5 at.%). The solubility of aluminum in the hexagonal structure increases as the atomic size of R decreases (from x50–3.42 in Tb2Fe17-xAlx to x=0–4.75 in Er2Fe17-xAlx), while that in the rhombohedral structure decreases (from x=7.70–9.41 in Tb2Fe17-xAlxto x=5.70–7.03 in Er2Fe17-xAlx). The cell parameters suggest that the nature of the atomic substitutions in the various crystal structures changes as a 2 172x x function of both structure type and atomic size of R.

Keywords

Phase diagrams
Rare-earth iron aluminides
Ferromagnetic compounds

UNIGE affiliation entities

Faculté des sciences / Section de physique / Département de physique de la matière quantique

UNIGE research groups

Groupe Cerny

Citation (ISO format)

YANSON, T. et al. Effect of aluminum substitution and rare-earth content on the structure of R₂(Fe_1-xAl_x)₁₇ (R=Tb, Dy, Ho, Er) phases. In: Journal of alloys and compounds, 2001, vol. 320, p. 108–113. doi: 10.1016/S0925-8388(01)00930-6

Article (Published version)

Identifiers

PID : unige:35650
DOI : 10.1016/S0925-8388(01)00930-6

Additional URL for this publication

http://www.sciencedirect.com/science/article/pii/S0925838801009306

Journal ISSN

0925-8388

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14/04/2014 09:40:00

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