Talk:Quasicrystal

A couple of other sources ([[1]], [[2]]) state that Schechtman observed quasicrystals in 1984, but this article says 1982. Which is correct?

Crust 15:04, 1 Feb 2005 (UTC)

Shechtman et al. discovered the quasicrystalline phase in 1982 and published their results in 1984 (Phys. Rev. Lett. 53 (1984) 1951). — Preceding unsigned comment added by 140.105.8.31 (talk • contribs)

Potential Uses of quasicrystals

I am currently reading a book on Atlantis which explains the use of quasicrystals as "libraries", storing massive amounts of information which is programmed into them telepathically. Does anyone have some information on this or telepathy in any state? Skeptics need not respond — Preceding unsigned comment added by Nonskeptic (talk • contribs)

No need to answer to the last comment, but quasicrystals have been used indeed for practical applications. Due to their low friction coefficient they have been used as coating in frying pans by a french firm. quasicrystals are also promissing materials for hydrogen storage especially the Zr-Ti-Ni alloy. — Preceding unsigned comment added by 69.138.202.161 (talk • contribs)

"bent" linear subspaces?

In a quasicrystal, flaws are locations where the 3D "subspace" is bent, or wrinkled, or broken as it passes through the higher-dimensional space.

seems to contradict the earlier description of non-periodic tilings (in that definition, the subspace was linear!). Can anyone clarify?

RandomP 01:24, 28 April 2006 (UTC)

Needs Revision?

I think that this article should be thoroughly revised. Since Shechtman's discovery many new experimental results have been reported. In physics 'Quasicrystals' has been a fashionable topic during the last 20 years, with lots of popular examples. Mathematicians have also taken some interest in this recent development. And now there is a pile of books with 'quasicrystal' in the title. None of this is apparent in the article. (I have added a few lines, but an expert is needed to rewrite all.)15:32, 28 June 2006 (UTC)After some reading, did some more rewriting but it is still far from being acceptable .al 14:34, 28 January 2007 (UTC)

Removed:

• Quasi crystal inspired pentagon tile by Alexander Braun.

It is a nice picture but not exactly a quasicrystal; relevant material can be seen at the external links.al 17:51, 18 September 2006 (UTC)

1D quasicrystals?

Are one dimensional quasicrystals possible? Can anyone give me an example(mathematical example is fine) of a 1D quasicrystal?

(Check the link to S.Weber's Introduction):

10110101101101011010110110101101101011010110... The Fibonacci sequence is a standard example of 1D quasicrystal: it is neither ordered ('crystal') nor disordered ('noise'). The Fourier transform of such nonperiodic systems with well defined long range order exhibits delta peaks with spacings which are fractions of some irrational number. The absence of this feature is taken as a sign of insufficient long range order and then the systems are taken to be closer to random ones. The Bombieri-Taylor argument allows eventually to identify the quasicrystals.195.96.229.95 07:44, 7 August 2006 (UTC)

Examples of quasicrystals

Maybe we can link to examples of quasicrystals that have their own page in wikipedia? One family of quasicrystals is the high temperature superconductors Bi-2201, Bi-2212, Bi-2223. They have a crystal unit cell that's modulated by a displacment function whose wavevector has irrational components. --spiralhighway 07:41, 14 August 2006 (UTC)

PS: By the way there's a great review article about all this stuff by Akiji Yamamoto: Acta Cryst. A52, 509-560 (1996)

Needs improvement

The grammar and spelling need improvement in the main article.