Mossbauer study of rare-earth intermetallic compounds R3T29Si4B10

A Fe-57 Mossbauer study has been conducted on the Fe-57 doped novel rare-ea rth intermetallic compounds R3T29Si4B10 (R = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy , Ho, Er, Tm and Lu, T = Ni, Co). The Fe-57 Site assignment has been invest igated by Fe-57 Mossbauer spectroscopy combined with thermodynamic analysis and crystal field estimation. The investigation demonstrated that Fe-57 at oms preferentially occupy the 2c crystallographic site with (4) over bar m2 local symmetry in the R3T29Si4B10 compounds. Sequentially, the 8j1, 8j2 an d 8i2 crystallographic sites are the second preferentially occupied and 8i3 and 16 K sites are the third preferential occupancy group of iron atoms. T he magnetic hyperfine interaction at 4.2 K demonstrates the effect of a spi n-induced Co magnetic moment.