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PuNi crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Pu is bonded in a 7-coordinate geometry to seven equivalent Ni atoms. There are a spread of Pu–Ni bond distances ranging from 2.84–2.95 Å. Ni is bonded in a 9-coordinate geometry to seven equivalent Pu and two equivalent Ni atoms. Both Ni–Ni bond lengths are 2.47 Å.
The synthesis, structural, magnetic, thermal, and transport properties are reported for polycrystalline PrIr 3 . At room temperature PrIr 3 displays the rhombohedral space group R–3m and a PuNi 3 -type structure. At around 70 K a phase transition to a monoclinic C2/m structure is observed and continued cooling reveals temperature independent behavior of the unit cell volume. Further, PrIr 3 undergoes a paramagnetic to ferromagnetic transition with T c =7.5K. The temperature dependent magnetic susceptibility follows the Curie-Weiss law with a positive Curie-Weiss temperature, and an effective moment that is close to the theoretical effective moment for a free Pr +3 ion. Finally, the structural transition introduces further complexity into the behavior of PuNi 3 -type materials and highlights the importance of temperature-dependent structural studies to complement physical property measurements in intermetallic compounds.
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