In this work we review our current understanding of structure, stability and formation of icosahedral quasicrystals and approximants. The work has special emphasis on Cd–Yb type phases, but several concepts are generalized to other families of icosahedral quasicrystals and approximants. The paper handles topics such as chemical order and site preference at the cluster level for ternary phases, valence electron concentration and its influence on formation and composition, fundamental building blocks and cluster linkages, and the similarities and differences between different families of icosahedral quasicrystals and approximants.
Cet article discute notre compréhension actuelle de la formation, de la stabilité et de la structure atomique des quasicristaux icosaédriques et de leurs approximants. Plus particulièrement consacré aux phases de type Cd–Yb, il présente plusieurs concepts qui sont applicables aux autres familles de phases icosaédriques et dʼapproximants. Ainsi, on discutera ici lʼordre chimique et les sites préférentiels dans les amas atomiques pour les systèmes ternaires, la concentration des électrons de valence et son influence sur la formation et la composition des amas atomiques, blocs constitutifs des structures, et les connexions entre amas, en soulignant les similarités et les différences entre les diverses familles de quasicristaux icosaédriques et leurs approximants.
Mot clés : Quasicristaux, Approximants, Amas atomique, Ordre chimique, Rapport électron sur atome, Structure de type Cd–Yb
Cesar Pay Gómez 1; An Pang Tsai 2
@article{CRPHYS_2014__15_1_30_0, author = {Cesar Pay G\'omez and An Pang Tsai}, title = {Crystal chemistry and chemical order in ternary quasicrystals and approximants}, journal = {Comptes Rendus. Physique}, pages = {30--39}, publisher = {Elsevier}, volume = {15}, number = {1}, year = {2014}, doi = {10.1016/j.crhy.2013.10.007}, language = {en}, }
Cesar Pay Gómez; An Pang Tsai. Crystal chemistry and chemical order in ternary quasicrystals and approximants. Comptes Rendus. Physique, Volume 15 (2014) no. 1, pp. 30-39. doi : 10.1016/j.crhy.2013.10.007. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2013.10.007/
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