Moessbauer study of rare-earth intermetallic compounds R3T29Si4B10

A 57Fe Moessbauer study has been conducted on the 57Fe doped novel rare-earth intermetallic compounds R3T29Si4B10 (R = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm and Lu, T=Ni, Co). The 57Fe site assignment has been investigated by 57Fe Moessbauer spectroscopy combined with thermodynamic analysis and crystal field estimation. The investigation demonstrated that 57Fe atoms preferentially occupy the 2c crystallographic site with 4-barm2 local symmetry in the R3T29Si4B10 compounds. Sequentially, the 8j1, 8j2 and 8i2 crystallographic sites are the second preferentially occupied and 8i3 and 16 K sites are the third preferential occupancy group of iron atoms. The magnetic hyperfine interaction at 4.2 K demonstrates the effect of a spin-induced Co magnetic moment. (author)