ISSN:
1600-5740
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
An analysis of the distribution of the M—M distances (M = Al, Ga, In, Tl) in all their binary, ternary and quaternary oxides, contained in the Inorganic Crystal Structure Database (ICSD95), shows that the M—M distances are not distributed uniformly, but present maxima at values which are near the corresponding distances in pure metals. As for boron, this feature reflects the tendency of these elements to form aggregates in their compounds. These metal aggregates maintain distances and, in many instances, also the topology of the elemental structures, as is illustrated here with two families of structures, i.e. spinels and delafossites. In spinels, the group 13 cations form a 3D (three-dimensional) network of truncated tetrahedra, which are also found in the Zintl phases of these elements. In MgAl2O4 the Al subnet is identical, in topology and dimensions, to that of CaAl2 and both reproduce exactly half of the f.c.c. (face-centred cubic) net of Al metal.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108768197012068
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