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Polytypes and polytypism
Published/Copyright:
August 25, 2010
Abstract
The definition of polytypism recommended by the IMA/IUCr joint committee on nomenclature is reviewed in the light of the structural variation observed in mineral and alloy systems. As a result of this review it is concluded that previous definitions of polytypism are too restrictive to be practical, and a definition which emphasises the structural basis of polytypism is proposed:
“Polytypism arises from the different modes of stacking of one or more structurally compatible modules.”
The various types of structural variation included under this definition are described using as examples minerals, ceramics, and alloys.
Published Online: 2010-8-25
Published in Print: 1986-10-2
© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München
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Articles in the same Issue
- Enstatite, Mg2Si206: A neutron diffraction refinement of the crystal structure and a rigid-body analysis of the thermal vibration
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- A study of decomposition methods for refinement of H+-ZSM5 zeolite with powder diffraction data
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- Copper(II) silicates and germanates with chain structures II. Crystal chemistry *
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- Fehlordnung bei Verbindungen MX3 mit Schichtenstruktur II. Analyse der Fehlordnung im Wismuttriiodid
- Effect of inaccessible volumes accompanied by symmetry elements on cumulative distribution functions
- Groups of simple and multiple antisymmetry of layers
- Electron diffraction intensity calculation and image simulation considering absorption for germanium and gold
- Structures of two modifications of Ca3GeO5
- Transverse quadratic electrostrictive effect in alkali halides with the NaCl structure*
