Magnetic and crystal structure of the novel compound Nd3Fe29−xTix

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Abstract
The structure of the compound previously reported as Nd2Fe19−xTix has been solved by powder neutron diffraction, which reveals a monoclinic cell and a stoichiometry of Nd3Fe29−xTix (x=1.24) and two formula units per unit cell. This low symmetry, and the large number of crystallographically unique sites (17), lead to a wide range of Fe—Fe bond lengths (from 2.36 to 3.01 Å) in a nearly continuous band. The phase forms through the replacement of two‐fifths of the rare earths in the RFe5 phase by Fe‐Fe dumbbells. The magnetic moments at room temperature lie along the monoclinic a axis with an average iron moment of 1.05 μB, while the magnetic moments at 12.5 K lie in the a‐b plane with an average iron moment of about 1.36 μB.