Kuczera Pawel, Wolny Janusz, Steurer Walter
AGH University of Science and Technology, al. Mickiewicza 30, Krakow, Poland.
Laboratory of Crystallography, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland.
Acta Crystallogr B Struct Sci Cryst Eng Mater. 2014 Apr;70(Pt 2):306-14. doi: 10.1107/S2052520613032575. Epub 2014 Mar 17.
The structure of decagonal Al-Cu-Rh has been studied as a function of temperature by in-situ single-crystal X-ray diffraction in order to contribute to the discussion on energy or entropy stabilization of quasicrystals. The experiments were performed at 293, 1223, 1153, 1083 and 1013 K. A common subset of 1460 unique reflections was used for the comparative structure refinements at each temperature. A comparison of the high-temperature datasets suggests that the best quasiperiodic ordering should exist between 1083 and 1153 K. However, neither the refined structures nor the phasonic displacement parameter vary significantly with temperature. This indicates that the phasonic contribution to entropy does not seem to play a major role in the stability of this decagonal phase in contrast to other kinds of structural disorder, which suggests that, in this respect, this decagonal phase would be similar to other complex intermetallic high-temperature phases.
通过原位单晶X射线衍射研究了十边形Al-Cu-Rh的结构随温度的变化，以促进对准晶体能量或熵稳定化的讨论。实验在293、1223、1153、1083和1013 K下进行。在每个温度下，使用1460个独特反射的公共子集进行比较结构精修。高温数据集的比较表明，最佳的准周期有序应存在于1083和1153 K之间。然而，无论是精修结构还是声子位移参数都没有随温度显著变化。这表明，与其他类型的结构无序相比，声子对熵的贡献似乎在该十边形相的稳定性中不起主要作用，这表明在这方面，该十边形相类似于其他复杂的金属间高温相。
