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Structural and magnetic characteristics of the intermetallic compounds Ho2Ni17 and Er2Ni17

The intermetallic compounds Ho2Ni17 and Er2Ni17 crystallize in the hexagonal structure of Th2Ni17 with lattice parameters a=8.32 AA, c=8.03 AA and a=8.28 AA, c=8.03 AA respectively. The compounds are ferrimagnetic and the effective magnetic moments per formula unit (fu) determined from the paramagnetic region are mu eff/fu=16.51 mu B for Ho2Ni17 and mu eff/fu=15.27 mu B for Er2Ni17, very close to the theoretical values of 16.44 mu B and 15.16 mu B. The critical Curie temperatures for the compounds are Tc=587 K (612 K after heat treatment) for Ho2Ni17 and Tc=572 K (605 K after heat treatment) for Er2Ni17.