Polytypism

From Online Dictionary of Crystallography

(Difference between revisions)
Jump to: navigation, search
(Tidied translations and added German and Spanish (U. Mueller))
 
(9 intermediate revisions not shown)
Line 1: Line 1:
-
<Font color="blue">Polytypisme</Font> (''Fr'').
+
<font color="blue">Polytypisme</font> (''Fr''). <font color="red">Polytypie</font> (''Ge''). <font color="black">Politipismo</font> (''It''). <font color="purple">多型現象</font> (''Ja''). <font color="green">Politipismo</font> (''Sp'').
== Definition ==
== 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.
+
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.
-
 
+
-
 
+
-
[http://dx.doi.org/10.1107/S0108768102003464 ''Acta Cryst.'' A'''40''', 399-404].
+
-
Acta Cryst. (1984). A40, 399-404; "Nomenclature of Polytype Structures"
+
-
Report of the International Union of Crystallography Ad-Hoc Committee on the Nomenclature of Disordered, Modulated and Polytype Structures
+
-
 
+
 +
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:
 +
[http://dx.doi.org/10.1107/S0108767384000842 ''Acta Cryst.'' A'''40''', 399-404(1984)], 'Nomenclature of Polytype Structures'.
==See also==
==See also==
-
Chapter 9.2 of ''International Tables of Crystallography, Volume C''
+
*[[Cell-twinning]]
 +
*[[Modular crystal structure]]
 +
*[[OD structure]]
 +
*[[Polymorphism]]
 +
*Chapter 9.2 of ''International Tables for Crystallography, Volume C''
-
[[Category:Fundamental crystallography]]
+
[[Category:Crystal chemistry]]

Latest revision as of 10:02, 17 November 2017

Polytypisme (Fr). Polytypie (Ge). Politipismo (It). 多型現象 (Ja). Politipismo (Sp).

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