Mossbauer effect studies of Dy[(Fe sub 0.7 CO sub 0.3 ) sub 1- X Al sub x ] sub 2 intermetallics

• Published in: Journal of alloys and compounds Vol. 299; no. 1-2; pp. 59 - 67
• Main Authors: Pszczola, J, Feret, A, Winiarska, B, Dabrowski, L, Suwalski, J
• Format: Journal Article
• Language: English
• Published: 14-03-2000
• ISSN: 0925-8388

It was previously found, that the magnetic hyperfine fields at exp 57 Fe nuclei in the Dy(Mn sub 1-x Fe sub x ) sub 2 and Dy(Fe sub 1-x Co sub x ) sub 2 intermetallic series form the two-branches of the Slater-Pauling curve with a maximum hyperfine field observed for the Dy(Fe sub 0.7 CO sub 0.3 ) sub 2 compound. The Al-substitution of the 3d-sublattice of the Dy(Fe sub 0.7 CO sub 0.3 ) sub 2 compound was studied in the present paper. For this purpose the intermetallic series Dy[(Fe sub 0.7 CO sub 0.3 ) sub 1-X Al sub x ] sub 2 was prepared and data of a detailed X-ray analysis are presented (300 K). The crystal structure depends on the Al-content. exp 57 Fe Mossbauer effect measurements on the Dy[(Fe sub 0.7 CO sub 0.3 ) sub 1-X Al sub x ] sub 2 intermetallics were performed (4.2 K) and the hyperfine interaction parameters were obtained from the experimental Mossbauer spectra. It was found that the magnetic hyperfine field observed at exp 57 Fe nuclei forms a new branch of the Slater-Pauling curve. Some determined crystallographic and Mossbauer data are compared to those already known for the other Al-substituted series. An attempt is made to discuss qualitatively the relations between the Al-substitution, the magnetic hyperfine fields and the possible structure of the 3d-band.