Structure and magnetic properties of RFe11TiNx (R=Y, Sm, and Dy)

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Abstract
Single phase alloys of composition RFe11Ti with R=Y, Sm, and Dy were prepared by induction melting. The samples were nitrided by thermal cycling to 770 K, at a heating rate of 10 K/min, under an atmosphere of nitrogen in a thermopiezic analyzer(TPA). For YFe11TiN the x‐ray diffraction(XRD) patterns give a=0.8611 nm and c=0.4802 nm for the tetragonal structure, space group I4/mmm. This represents a 3% volume expansion of the nitrogen‐free unit cell. The amount of absorbed nitrogen corresponds to one nitrogen atom per formula unit indicating that RFe11TiN is a true nitrogen compound with the nitrogen atoms occupying the 2b site in the structure. The expansion of the unit cell is accompanied by a dramatic increase in the Curie temperature for all compounds.