Intrinsic Properties of Ternary Rare-Earth Compounds from 57Fe, 161Dy, 166Er Mössbauer Spectroscopies

  • J. P. Sanchez

Abstract

57Fe, 161Dy and 166Er Mössbauer results are reported in the R2Fe14B alloys and some of the corresponding hydrides. The local moments at the six inequivalent iron crystallographic sites are inferred from the 57Fe hyperfine field data. The occurrence of fairly pure Jz = 15/2 state at the two Dy and Er sites is demonstrated from the near free ion values of the rare-earth hyperfine fields. Empirical estimates of the second order crystal field parameters are provided by the 161Dy quadrupole interaction data. Informations on the magnetic structures and spin reorientation phenomena are obtained from the study of magnetically oriented samples. A detailed analysis of the spin reorientation in (Er1-xDyx) 2Fe14B alloys allowed to estimate the importance of higher order crystal field terms (B4 0, B6 0). The study of the R1+εFe4B4 phases indicated that the iron atoms are essentially non-magnetic and revealed the occurrence of a giant value for the crystal field parameter A2 0. The magnetic properties of the Nd (Co1-xFex)9Si2 alloys, inferred by combining bulk measurements with Mössbauer and NMR data, are presented.

Keywords

Mossbauer Spectroscopy Crystal Field Hyperfine Field Crystal Field Parameter Spin Reorientation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Berthier, Y., Chevalier, B., Etourneau, J., Rechenberg, H.R. and Sanchez, J.P. 1988. Magnetic properties of Nd(Co1 - xFex)9Si2 Alloys from magnetization, NMR and Mössbauer studies (to be published).Google Scholar
  2. Bogé, M., Coey, J.M.D., Czjzek, G., Givord, D., Jeandey, C., Li, H.S. and Oddou, J.L. 1986. A 155Gd Mössbauer study of a Gd2Fe14B single crystal. J. Phys. F 16, L67–72.CrossRefGoogle Scholar
  3. Chevalier, B., Gurov, G., Fournes, L. and Etourneau, J. 1987. New ferromagnetic compounds : the ternary silicides NdCo9-xFexSi2 (0 ≤ x ≤ 5).J. Chem. Research 5, 138.Google Scholar
  4. Givord, D., Li, H.S. and Moreau, J.M. 1984. Magnetic properties and crystal structure of Nd2Fe14B. Solid State Comm. 50, 497–499.CrossRefGoogle Scholar
  5. Givord, D., Li, H.S. and Tasset, F. 1985. Polarized neutron study of the compounds Y2Fe14B and Y2Fe14B. J. Appl. Phys. 57, 4100–4102.CrossRefGoogle Scholar
  6. Givord, D., Moreau, J.M. and Tenaud, P. 1986. Refinement of the crystal structure of R1+ε Fe4B4 compounds (R = Nd, Gd). J. Less Common Met. 123, 109–116.CrossRefGoogle Scholar
  7. Friedt, J.M., Sanchez, J.P., L’Heritier, P. and Fruchart, R.1984. Mössbauer spectroscopy in the RE2Fe14BHxmaterials. In “Proceedings of the Workshop on Nd-Fe Permanent Magnets” (Ed. I.V, Mitchell). (Commission of the European Communities, Brussels), pp.179–182.Google Scholar
  8. Friedt, J.M., Vasquez, A., Sanchez, J.P., L’Heritier, P. and Fruchart, R. 1986a. Magnetism and crystal field properties of the RE2Fe14BHx alloys (RE = Y, Ce, Dy, Er) from Mössbauer spectroscopy. J. Phys. F 16, 651–667.CrossRefGoogle Scholar
  9. Friedt, J.M., Vasquez, A., Sanchez, J.P., L’Héritier, P. and Fruchart, R. 1986b. Mössbauer spectroscopy on RE2Fe14BHx alloys. Hyperfine Interactions 28, 611–614.CrossRefGoogle Scholar
  10. Niarchos, D., Zouganelis, G., Kostikas, A. and Simopoulos, A. 1986. Magnetic properties of the R1=ε£Fe4B4 compounds (R = rare earth) from magnetization and Mossbauer measurements. Solid State Comm. 59, 389–391.CrossRefGoogle Scholar
  11. Rechenberg, H.R. and Sanchez, J.P. 1987. Effective magnetic fields on Fe in R1+εFe4 alloys. Solid State Comm. 62, 461–464.CrossRefGoogle Scholar
  12. Rechenberg, H.R., Sanchez, J.P., L’heritier, P. and Fruchart, R. 1987a. Crystal-field interactions and spin reorientation in (Er1-xDyx)2Fe14B. Phys. Rev. B 36, 1865–1871.Google Scholar
  13. Rechenberg, H.R., Bogé, M., Jeandey, C., Oddou, J.L., Sanchez, J.P. and Tenaud, p. 1987. 155Gd and 161Dy Mössbauer study of R1+εFe4B4 alloys (R = Gd, Dy). Solid State Comm. 64, 277–281.CrossRefGoogle Scholar
  14. Sanchez, J.P., Friedt, J.M., Vasquez, A., L’Héritier, P. and Fruchart, R. 1986. 166Er Mössbauer spectroscopy in the E2Fe14BHx alloys. Solid State Comm. 57, 309–313.CrossRefGoogle Scholar
  15. Sanchez, J.P. 1987. New permanent magnets investigated by Mossbauer spectroscopy. In “Proceedings of XXII Zakopane School on Physics, Part 2 : condensed matter studies by nuclear methods” (Eds. K. Krolas and K. Tomala) (Institute of Nuclear Physics and Jagiellonian University, Krakow), pp.156–193.Google Scholar
  16. Vasquez, A., Friedt, J.M., Sanchez, J.P., L’Héritier, P. and Fruchart, R. 1985. Spin reorientation phenomena in RE2Fe14B (RE = Ce, Dy, Er) alloys from 57Fe and 161Dy Mössbauer spectroscopies. Solid State Comm. 55, 783–786.CrossRefGoogle Scholar
  17. Vasquez, A. and Sanchez, J.P. 1987. Spin reorientation phenomena in (Er Gd ) Fe,B alloys. J. Less. Common. Met. 127, 71–78.CrossRefGoogle Scholar

Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1989

Authors and Affiliations

  • J. P. Sanchez
    • 1
  1. 1.Centre de Recherches Nucléaires (I N2 P3)Strasbourg CedexFrance

Personalised recommendations