Role of Ce substitution in the magneto-crystalline anisotropy of tetragonal ZrFe10Si2

Salazar, D.; Martín-Cid, A.; Garitaonandia, J. S.; Hansen, T. C.; Barandiaran, J. M.; Hadjipanayis, G. C.

doi:10.1016/j.jallcom.2018.06.225

Title: Role of Ce substitution in the magneto-crystalline anisotropy of tetragonal ZrFe10Si2

Journal Article · Mon Oct 01 00:00:00 EDT 2018 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2018.06.225· OSTI ID:1457102

;

; Garitaonandia, J. S.; Hansen, T. C.; Barandiaran, J. M.; Hadjipanayis, G. C.

We report the study of Zr_1-xCe_xFe₁₀Si₂ (x = 0.0, 0.3 and 0.6) compounds, with tetragonal ThMn12 structure, by means of neutron diffraction and Mössbauer spectroscopy to understand the role of Ce in the increasing magneto-crystalline anisotropy. Fitting of the ⁵⁷Fe Mössbauer spectra to the three Fe atomic positions, namely 8i, 8j and 8f, indicate that Ce displaces Fe from the 8i to the 8j positions and in parallel increases the quadrupole splitting (QS) in position 8f, correlating with the increase of the magneto-crystalline anisotropy. However, the hyperfine field Bhf remains constant for all Ce substitutions. The full occupancy of the 8j positions by Fe at Ce = 0.6 can explain the instability of the ThMn₁₂ structure for similar and higher Ce concentrations. Neutron diffraction experiments show the evolution of the magnetic moment and crystal structure as a function of temperature, showing Ce to cause an increase of the lattice parameters and tetragonal distortion. A large anomaly of the expansion coefficient, due to the spontaneous magnetostriction, is also disclosed. These results support a pure geometric influence of Ce on the magneto-crystalline anisotropy through a selective distortion of the lattice.

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Research Organization:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE Office of Science (SC); European Union's Horizon 2020 research and innovation programme

Grant/Contract Number:: FG02-90ER45413; 686056

OSTI ID:: 1457102

Alternate ID(s):: OSTI ID: 1610137

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 766 Journal Issue: C; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 11 works

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References (14)

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