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Figure 7
(a) HRTEM image of PD2 with 2 × 2 unit cells taken along the c axis (Hovmöller et al., 2012BB21). The tenfold wheels with atoms in black are clearly seen. (b) Atomic structure model of PD2 obtained by RED projected along the c axis. The circles indicate the 2 nm cluster columns with pseudo-tenfold rotational symmetry. Ni/Co atoms are in red and Al atoms in blue. (c) Structure model showing the arrangement of Ni/Co atoms at z = 0.25 (red) and z = 0.75 (red with yellow cross) layers. (d) The structure of PD4 (a = 101.3, b = 32.0, c = 4.1 Å), as determined by X-ray crystallography (Oleynikov et al., 2006BB24). The circles mark the 2 nm clusters similar to those found in PD2.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 47| Part 1| February 2014| Pages 215-221
doi:10.1107/S1600576713029294
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