Abstract Samples of YPdCd, Y 2 Pd 2 Cd and Y 2 Cu 2 Cd were synthesized from the elements by induction melting. The three cadmium phases were characterized through their Guinier powder patterns. YPdCd crystallizes with the hexagonal ZrNiAl-type structure (space group P 6 ‾ 6 2 m ; a = 756. 0 (4) and c = 384. 7 (2) pm). The structure of Y 2 Pd 2 Cd was refined from single-crystal X-ray diffractometer data: Mo 2 B 2 Fe type, tetragonal space group P 4/ mbm, a = 765. 33 (3), c = 370. 30 (2) pm, w R 2 = 0. 0254, 289 F 2 values and 12 variables. Y 2 Pd 2 Cd is a 1: 1 intergrowth structure of CsCl and AlB 2 related slabs of compositions ‘YCd’ and ‘YPd 2 ’. The palladium dumb-bells (279 pm Pd–Pd) and the cadmium atoms (301 pm Cd–Pd) form a two-dimensional Pd 2 Cd substructure that is separated by yttrium layers in c direction. Consistent with their crystal structures, the 113 Cd solid-state MAS-NMR spectra of Y 2 Pd 2 Cd and isotypic Y 2 Cu 2 Cd show only one signal characterized by strong Knight shift contributions.
Johnscher et al. (Tue,) studied this question.
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