A Magnetic, Neutron Diffraction, and Mössbauer Spectral Study of the Ce₂Fe₁₇₋ₓGaₓ Solid Solutions

Author

Gary J. Long, Missouri University of Science and TechnologyFollow
Sanjay R. Mishra
Oran Allan Pringle, Missouri University of Science and TechnologyFollow
Zhong Bo Hu
William B. Yelon, Missouri University of Science and Technology
Fernande Grandjean, Missouri University of Science and TechnologyFollow
D. P. Middleton
K. H. J. Buschow

Abstract

The magnetic properties of the rhombohedral Ce₂Fe_17-xGa_x solid solutions, with x equal to 0.3, 0.5, 0.7, 1.0, and 2.0, have been studied by magnetic measurements, neutron diffraction, and Mössbauer spectroscopy. Magnetization studies indicate that, as the unit cell volume expands with Ga addition, the Curie temperature increases from 238 K for Ce₂Fe₁₇ to 406 K for Ce₂Fe₁₅Ga₂. Powder neutron diffraction measurements at 295 and 14 K indicate that the Fe moments are both oriented in the basal plane and increase with increasing Ga content. The Mössbauer spectra, which have been fit with a binomial distribution of the near-neighbor environments, indicate that the maximum, hyperfine field, H_max, increases with increasing Ga content and is largest for the 6c site. The decremental field, ΔH, per added Ga atom is virtually independent of temperature and Ga content, indicating that the next-nearest-neighbor interactions are very small. The compositional dependence of the isomer shifts for R₂Fe_17-xM_x, where R is Ce or Tb and M is Al, Si, or Ga, is analyzed in terms of volume and chemical terms, the second of which reveals the importance of the electronic configuration of M in understanding its influence on the magnetic properties of these solid solutions. Finally, the similarities and differences in the changes in crystallographic, magnetic, and Mössbauer spectral properties of R₂Fe_17-xM_x, at low x values, indicate that electronic rather than structural factors are more important in modifying the magnetic properties and indicate the need for extensive band structure calculations on these solid solutions.

Recommended Citation

G. J. Long et al., "A Magnetic, Neutron Diffraction, and Mössbauer Spectral Study of the Ce₂Fe₁₇₋ₓGaₓ Solid Solutions," Journal of Magnetism and Magnetic Materials, vol. 176, no. 2016-02-03, pp. 217 - 232, Elsevier, Dec 1997.

The definitive version is available at https://doi.org/10.1016/S0304-8853(97)00650-1

Department(s)

Chemistry

Second Department

Physics

Keywords and Phrases

Band Structure; Cerium Alloys; Ferrimagnetism; Magnetic Properties; Magnetic Variables Measurement; Magnetization; Mössbauer Spectroscopy; Neutron Diffraction; Solid Solutions; Temperature; Cerium Iron Gallium Alloys; Curie Temperature; Cerium Compounds; Mössbauer Effect

International Standard Serial Number (ISSN)

0304-8853

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1997 Elsevier, All rights reserved.

Publication Date

01 Dec 1997