Model of the transformation of several basis structures into intermetallic crystal structure types

✍ Scribed by M. Ruhnow

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 337 KB
• Volume: 46
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.201100033

✦ Synopsis

A model is presented that states that all intermetallic crystal structure types can be hypothetically derived from few basis structures. These hypothetical basis structures consist of different atomic layer stackings and conform to the principles of simplicity and high symmetry. The transition from the basis structure to the real structure takes place by the replacement of formerly occupied atomic sites by interstices followed by a lateral relaxation of the remaining atoms. This leads to, in most cases, a lowering of symmetry and packing density, as well as an alteration of stoichiometry. The requirement of the transition to the known real structure depends on the individual "nature" of the atoms of the different elements in the compound. The connection between basis structures and crystalline non-equilibrium phases is highlighted. Non-equilibrium phases, a topic of modern research, can be regarded as "frozen-in" basis structures.