Crystal structure magnetic properties and hyperfine interactions in RFe4Al8 (R = rare earth) systems
作者： I. Felner , I. Nowik
DOI: 10.1016/0022-3697(78)90109-9
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摘要: Abstract X-ray, magnetic susceptibility and 57Fe, 151Eu, 155Gd 170Yb Mossbauer studies were performed. Detailed analysis of X-ray intensities yields all ion locations interatomic distances in the body centered tetragonal structure (space group I4/MMM). The unit cell contains two formula units. rare earth, iron aluminum occupy 2(a), 8(f) 8(i) 8(j) crystallographic sites, respectively. indicate existence independent sublattices. sublattice orders into an antiferromagnetic at about 120 K, whereas earth (excluding those with La, Ce, Eu, Y Lu) antiferromagnetically 20 K. yield, addition to hyperfine interaction parameters, also direction along which moments are aligned. In EuFe4Al8 Eu is a mixed valent state.
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