Symmetry and Asymmetry in Quasicrystals or Amorphous Materials

被引:0
|
作者
Barber, Enrique Macia [1 ]
机构
[1] Univ Complutense Madrid, Fac CC Fis, Dept Fis Mat, Madrid 28040, Spain
来源
SYMMETRY-BASEL | 2020年 / 12卷 / 08期
关键词
D O I
10.3390/sym12081326
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Quasicrystals (QCs) are long-range ordered materials with a symmetry incompatible with translation invariance. Accordingly, QCs exhibit high-quality diffraction patterns containing a collection of discrete Bragg reflections. Notwithstanding this, it is still common to read in the recent literature that these materials occupy an intermediate position between amorphous materials and periodic crystals. This misleading terminology can be understood as probably arising from the use of models and notions borrowed from the amorphous solid's conceptual framework (such us tunneling states, weak interference effects, variable range hopping, or spin glass) in order to explain certain physical properties observed in QCs. On the other hand, the absence of a general, full-fledged theory of quasiperiodic systems certainly makes it difficult to clearly distinguish the features related to short-range order atomic arrangements from those stemming from long-range order correlations.
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页数:3
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