ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The origin of the crystallographic pedigree [Haisa (1978). Acta Cryst. A34, 753-759] is shown to be the Fm3m family, by examining crystal structures of chemical elements and compounds. The family is maintained by making the most of the relevant symmetry sites over the structures of a (Strukturbericht A1), ab (B1), ac (C1), abc (L21), abd, ae, abe, ace (J11), abce (J21), abcde, bcef (D89), abcef (H58), cdf, bdef (D8a), abdef; acefh (D84), ai (D2f), abcgj, abdfk and abcejl types in Wyckoff notation. The descent in site symmetry from Oh to its subgroups may be caused by the balance of the interactions between the neighbors of atomic contents which can be estimated from the lifting of the degeneracy of the nearest-neighbor distances, or the coordination index. When the interactions become out of balance, a descent of the space group through Pm3m, Im3m and P63/mmc to their subgroups occurs to form the crystallographic pedigree.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739482000990
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