Diffuse scattering and phason fluctuations in the Zn-Mg-Sc icosahedral quasicrystal and its Zn-Sc periodic approximant.
Diffuse scattering and phason fluctuations in the Zn-Mg-Sc icosahedral quasicrystal and its Zn-Sc periodic approximant.
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DOI：
10.1103/physrevlett.95.105503
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发表时间：
2005-09
影响因子：
8.6
通讯作者：
M. de Boissieu;S. Francoual;Y. Kaneko;T. Ishimasa
中科院分区：
文献类型：
--
作者：
M. de Boissieu;S. Francoual;Y. Kaneko;T. Ishimasa
我们报告了 ZnMgSc 二十面体准晶及其周期性近似中 X 射线漫散射的绝对尺度测量。虽然近似体中的漫散射纯粹是由热漫散射引起的，但在准晶体中观察到了附加信号。它与相子波动有关，如其 Q(2)(per) 依赖性所示。此外，与之前对 i-AlPdMn 相进行的测量相比，我们发现 i-ZnMgSc 相中的漫散射量较小，这与该相中较大的相子弹性常数一致。这通过观察大量具有高 Q(per) 倒易空间分量的弱布拉格峰得到证实。
We report on the absolute scale measurement of the x-ray diffuse scattering in the ZnMgSc icosahedral quasicrystal and its periodic approximant. Whereas the diffuse scattering in the approximant is purely accounted for by thermal diffuse scattering, an additional signal is observed in the quasicrystal. It is related to phason fluctuations as indicated by its Q(2)(per) dependence. Moreover, when compared to previous measurements carried out on the i-AlPdMn phase, we find that the amount of diffuse scattering is smaller in the i-ZnMgSc phase, in agreement with larger phason elastic constants in this phase. This is confirmed by the observation of a large number of weak Bragg peaks having a high Q(per) reciprocal space component.