The effect of Ga substitution on the magnetic properties of Nd2Fe14B, Pr2Fe14B, and PrCo5

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Abstract
R2Fe14−xGaxB (R=Pr and Nd) and PrCo5−xGax alloys were synthesized and examined by powder x‐ray diffraction at room temperature and by magnetometry in the temperature range 4.2–1100 K. Lattice parameters, Curie temperature, spin‐reorientation temperatures, anisotropy fields, and saturation magnetizations were determined. Phase analysis revealed that single‐phase materials exist only for x≤1 in the case of 2:14:1 alloys and for x≤2 for 1:5 alloys. An increase in lattice parameters is observed upon Ga substitution in all cases. About 20 K increase in the Curie temperature is observed for 2:14:1 alloys, whereas there is a dramatic decrease in 1:5 alloys. Saturation magnetization values decrease upon Ga substitution. The anisotropy field is slightly enhanced by Ga addition in the Nd2Fe14−xGaxB system. Spin‐reorientation phenomena in Nd2Fe14−xGaxB and PrCo5−xGax are strongly affected by Ga addition. The observed behavior is discussed in terms of preferential substitution of Ga atoms into the Nd2Fe14B‐type crystal structure and random substitution into the CaCu5‐type crystal structure.

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