Phason-strain analysis of the twinned approximant to the decagonal quasicrystal $\mathrm{Al_{70} Co_{15} Ni_{15}}$ : Evidence for a one-dimensional quasicrystal
| Autor: | Kalning, M., Kek, S., Krane, H. G., Dorna, V., Press, W., Steurer, W. |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Physical review / B 55(1), 187-192 (1997). doi:10.1103/PhysRevB.55.187 |
| Popis: | Physical review / B 55(1), 187 - 192 (1997). doi:10.1103/PhysRevB.55.187 In high-resolution x-ray diffraction sometimes a pronounced splitting of the strongest Bragg reflections in decagonal Al70 Co15 Ni15 is observed. So far, this has been interpreted as evidence for a twinned (micro-)crystalline state with large lattice parameters. In the present paper we show that the metrics can be perfectly reproduced by modeling a twinned one-dimensional quasicrystal rather than a twinned three-dimensional crystalline phase. The split peak positions can easily be reproduced by application of a linear phason strain on the ideal decagonal quasicrystal and subsequent fivefold twinning. New high-resolution x-ray-diffraction data are used in this analysis. An anisotropic broadening of all investigated reflections leads us to suggest a nonlinear phason-strain component. Published by Inst., Woodbury, NY |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|