| 释义 |
quasicrystal, n. Physics.|ˈkweɪzaɪˌkrɪstəl|
[f. quasi- 2 + crystal n.]
A regular aggregation of molecules of a particular compound in a structure which has some of the properties of a crystal lattice, such as the ability to diffract radiation as a crystal does, but whose spatial periodicity is incommensurable. Cf. quasi-crystalline adj. s.v. quasi- 2 b.
1984Levine & Steinhardt in Physical Rev. Lett. LIII. 2477/2 We began a long, systematic investigation of the properties of the Penrose lattice to see if other such lattices might exist in 2D and 3D. We find that the Penrose lattice is just one of an infinite set of 2D and 3D lattices that exhibit the BOO and self-similarity properties of a crystal, but have quasiperiodic (QP), rather than periodic, translational order. We term such lattices ‘quasicrystals’. 1985Nelson & Halperin in Science 19 July 235/2 Structures containing several incommensurate spatial periodicities, which are not simply periodic but nevertheless have a diffraction pattern with δ-function Bragg peaks, might be called ‘quasicrystals’, by analogy with the term ‘quasi-periodic motion’ that is used for simple dynamic systems having two incommensurate periods. 1986Physica Scripta T. XIII. 295 Well-facetted external shapes of domains of the quasicrystal material were..observed in the specimen. 1988[see *Penrose n.]. |