Moessbauer and x-ray study of the self-induced magnetostatic distortion of Tb/sub x/Y/sub 1-x/Fe$sub 2$ laves phases

Conference · Wed Jan 01 04:00:00 EST 1975 · AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 660-661

OSTI ID:4162339

Preston, R S; Dwight, A E; Fedro, A J; Kimball, C W

A comparison was made between x-ray diffraction data and Moessbauer absorption data for a series of ferrimagnetic compounds Tb/sub x/Y/sub 1-x/Fe$sub 2$. Previous work has shown that the volume and the rhombohedral angle of the distorted ''cubic'' unit cell both vary with the Tb concentration x, but that the distortion disappears for x less than or equal to 0.25. Since this is close to the concentration where the rare-earth and the iron sublattice magnetizations are equal and opposite, a detailed study of the $sup 57$Fe Moessbauer spectra was made for these compounds in the vicinity of x = 0.25. Results confirm the previous finding that the magnetic hyperfine field varies continuously with the Tb concentration. Also, they reveal that the Fe sites are not all equivalent chemically and crystallographically, and that this is true whether or not the rhombohedral distortion is present. This suggests that in addition to the rhombohedral distortion there may be an independent distortion or shifting of the iron tetrahedra within the unit cube. (auth)

• Research Organization: Northern Illinois Univ., DeKalb
• NSA Number: NSA-33-003603
• OSTI ID: 4162339
• Conference Information: Journal Name: AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 660-661
• Country of Publication: United States
• Language: English

Related Subjects

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CHEMICAL COMPOSITION
FERRIMAGNETIC MATERIALS
INTERMETALLIC COMPOUNDS
IRON 57
LAVES PHASES
MOESSBAUER EFFECT
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Ceramics
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X-RAY DIFFRACTION