Abstract
Temperature changes of lattice parameters in TbPdIn, DyNiAl and GdNiAl were investigated using the low-temperature X-ray powder diffraction, and related to the magnetic ordering in these compounds. All three compounds exhibit a strong magneto-crystalline anisotropy. Additional powder diffraction measurements were performed in external magnetic fields to assess the orientation of magnetic moments with respect to the crystal axes. No significant preferential orientation of crystallites due to the macroscopic ordering in magnetic field was observed below T c in TbPdIn. On the contrary, the other compounds became macroscopically well ordered below the magnetic-phase transition temperature. DyNiAl had the preferred orientation 00l parallel to the direction of the magnetic field; the preferred orientation of crystallites in GdNiAl exposed to external magnetic field was hk0 .
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