Abstract
The magnetic properties of the ternary rare-earth compound TbNiAl with the hexagonal ZrNiAl crystal structure have been discussed in terms of a geometrically magnetic frustration. We have carried out measurements of magnetic susceptibility and magnetization of Tb 1− x Y x NiAl ( 0 ≤ x ≤ 0.3 ) polycrystalline samples to study the dilution effect on magnetic properties of TbNiAl. A small substitution of nonmagnetic ions of Y ( x ≥ 0.1 ) for magnetic ions of Tb stabilizes the ferromagnetic state. This finding suggests that the number of frustrated bonds is strongly reduced by introduction of nonmagnetic Y sites and a dominant ferromagnetic interaction appears instead.
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