Difference between revisions of "Polytypism"
From Online Dictionary of Crystallography
(→See also) |
(change of category, see also) |
||
| Line 10: | Line 10: | ||
==See also== | ==See also== | ||
*[[OD structure]] | *[[OD structure]] | ||
| + | *[[Polymorphism]] | ||
*Chapter 9.2 of ''International Tables of Crystallography, Volume C'' | *Chapter 9.2 of ''International Tables of Crystallography, Volume C'' | ||
| − | [[Category: | + | [[Category:Crystal chemistry]] |
Revision as of 04:43, 3 December 2014
Polytypisme (Fr); Politipismo (It); 多型 (Ja).
Definition
An element or compound is polytypic if it occurs in several structural modifications, each of which can be regarded as built up by stacking layers of (nearly) identical structure and composition, and if the modifications differ only in their stacking sequence. Polytypism is a special case of polymorphism: the two-dimensional translations within the layers are essentially preserved.
The complete definition is given in the Report of the International Union of Crystallography Ad-Hoc Committee on the Nomenclature of Disordered, Modulated and Polytype Structures: Acta Cryst. A40, 399-404(1984), "Nomenclature of Polytype Structures".
See also
- OD structure
- Polymorphism
- Chapter 9.2 of International Tables of Crystallography, Volume C