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Title

Exploring the magneto-volume anomalies in Dy2Fe17 with unconventional rhombohedral crystal structure

AuthorsÁlvarez-Alonso, Pablo; Gorria, P.; Puente-Orench, I.; Sánchez-Marcos, J. ; Blanco, J. A.
KeywordsX-ray and neutron diffraction
Rare earth/iron alloys
Crystal and magnetic structures
High pressure
Magneto-volume anomalies
Issue Date2013
PublisherElsevier
CitationActa Materialia 61(20): 7931-7937 (2013)
AbstractWe have synthesized the Dy2Fe17 alloy with an unconventional crystal structure (R3̄m space group). Neutron powder thermo-diffraction and X-ray powder diffraction under high pressure (up to 15 GPa) show that the rhombohedral crystal structure is stable. Likewise, the alloy with the usual hexagonal crystal structure (P63/mmc), the rhombohedral variant of Dy2Fe17 compound, exhibits a collinear ferrimagnetic order below the Curie temperature (TC ≈ 363 K), with antiparallel mutual alignment of the Dy and Fe sublattices. Additionally, we have observed two distinctive issues related to magneto-volume anomalies: (i) the pressure dependence of the cell volume at room temperature shows the existence of a critical pressure at which the compound is no longer ferrimagnetic; and (ii) the cell volume shows invar-like behaviour in a wide temperature range (2-290 K), with a minimum at T ≈ 380 K. The spontaneous volume magnetostriction reaches ωS = 1.6 × 10 -2 at 2 K that decreases to zero at T ≈ 500 K (≈1.4 T C), which is associated with the existence of short-range magnetic correlations.
Descriptionet al.
Publisher version (URL)http://dx.doi.org/10.1016/j.actamat.2013.09.034
URIhttp://hdl.handle.net/10261/117589
DOI10.1016/j.actamat.2013.09.034
ISSN1359-6454
Appears in Collections:(ICMA) Artículos
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