Crystal structure and magnetic properties of the new ternary actinide compounds in An-Pd-Al system (An=U, Np)

Y. Haga, D. Aoki, Y. Homma, S. Ikeda, T. D. Matsuda, E. Yamamoto, H. Sakai, N. Tateiwa, N. D. Dung, A. Nakamura, Y. Shiokawa, Y. Onuki

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1 Citation (Scopus)


We report the crystal structure and magnetic properties of new ternary actinide compounds. A series of compounds having AnPd5Al2 composition crystallize in the body-center tetragonal ZrNi2Al 5-type tetragonal structure (/4/mmm). Although the magnetic susceptibility of both compounds follows the Curie-Weiss behavior at high temperature, no magnetic phase transition was observed. UPd5Al 2 has a nonmagnetic ground state where the magnetic susceptibility saturates at low temperature, while NpPd5Al2 superconducts below 4.9 K as reported recently. Another new ternary uranium intermetallic compound U 2/3Pd2Al5 crystallizes in the hexagonal structure (P63/mmc) with the lattice parameters 4.3278 and c = 16.2870 Å. The composition analysis and the single crystal X-ray diffraction revealed the peculiar disordered structure where 1/3 of uranium atoms are replaced by three aluminum atoms. The similar structure is reported previously for the compound in U-Fe-Si system. Magnetization as well as specific heat measurements revealed a low temperature anomaly corresponding to the magnetic phase transition.

Original languageEnglish
Pages (from-to)1601-1606
Number of pages6
JournalJournal of Optoelectronics and Advanced Materials
Issue number7
Publication statusPublished - 2008 Jul


  • Actinide intermetallics
  • Crystal growth
  • X-ray diffraction


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