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UIr, a PdBi-like distorted CrB-type structure

1986; Elsevier BV; Volume: 125; Linguagem: Inglês

10.1016/0022-5088(86)90091-3

1878-2728

Theo Siegrist, Y. Le Page, V. Gramlich, W. Petter, A. Dommann, F. Hulliger,

Iron-based superconductors research

The room-temperature structure of UIr was found to be monoclinic with cell parameters a = 7.271(1) Å, b = 10.578(2) Å, c = 8.511(1) Å, β = 90.16(1) °; Z = 16, space group B21. The final residual value for 960 observed reflections was R = 0.082 and 0.124 for all 1502 unique reflections. The structure of UIr is a distortion variant of the CrB type similar to that of PdBi, although there the monoclinic angle is acute. The distortions lead to bonds between adjacent iridium zigzag chains.