Abstract
We have used neutron powder diffraction to make a comprehensive study of the crystal structure in Pr2Fe17 nanocrystalline compounds. These nanostructured materials have been obtained by high-energy ball milling from an arc-melted bulk polycrystalline alloy. The Th2Zn17-type rhombohedral crystal structure of the starting bulk alloy is maintained after milling for 10 and 20 hours. The studied alloys are ferromagnetic below TC = 286±1 K (bulk) and TC ≈ 300±20 K (milled). These materials exhibit strong magneto-volume anomalies below TC, such as a negative coefficient of thermal expansion (αV ≈ -30 × 10−6 K−1).
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