Alquimia
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Why most quasicrystals (if not, all) are of metallic compounds?
I recently raised the idea of growing quasicrystals. No, they are not normal crystals, they are aperiodic as something amorphous but regular, and may
have symmetries of 5, 7, 8, 9, etc. which are impossible in common crystals.
I asked here to see if there was any salt or compound soluble in common materials, capable of forming stable quasicrystals.
But after the few answers, and after take a look through the internet, I was disappointed: all quasicrystals are metallic.
I would like to know if the existence of ionic and covalent quasicrystals is really impossible (and why), or if they can exist at least in theory.
[Edited on 12-10-2017 by Alquimia]
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CRUSTY
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I know you were looking for soluble ionic quasicrystals, but I think this is just as spicy of a discovery (I love quasicrystals): [Wired article].
They're not salts, but rather organic, and they're self assembling too! The base unit is ferrocenecarboxyllic acid. Not what you asked for, but pretty
neat anyways.
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Hegi
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I am also really amazed by quasicrystals but as long as we do not know how is it possible at all that such a compounds exist, we can only guess. Maybe
when you find a set of ions in well defined stoichiometric ratio - you can get them too. No idea.
Maybe another interesting question would be - what inorganic salt crystallizes in a form of tetrahedron? 
Our webpage has been shut down forever cause nobody was willing to contribute. Shame on you all!!!
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crystal grower
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Quote: Originally posted by Hegi  |
Maybe another interesting question would be - what inorganic salt crystallizes in a form of tetrahedron? |
Tennantite-tetrahedrite series minerals .
Cu6[Cu4(Fe,Zn)2]As4S13 to Cu6[Cu4(Fe,Zn)2]Sb4S13
https://www.mindat.org/min-1437.html
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Hegi
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I know, try to crystallize it at home.. .) Think of something else..
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crystal grower
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You have not mentioned home crystallization  . But ok I'll try to think of
something else...
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CaCl2
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| Quote: Originally posted by Hegi | I am also really amazed by quasicrystals but as long as we do not know how is it possible at all that such a compounds exist, we can only guess. Maybe
when you find a set of ions in well defined stoichiometric ratio - you can get them too. No idea.
Maybe another interesting question would be - what inorganic salt crystallizes in a form of tetrahedron? |
Possibly sodium bromate under some conditions:
http://www.sciencedirect.com/science/article/pii/00220248950...
I have no access to the article itself, so I have no idea what the required conditions are or how large the crystals tend to be, It's also
hydroscopic which makes storing them harder.
[Edited on 4-11-2017 by CaCl2]
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crystal grower
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Can I post .pdf of that article here or should I post it in references?
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Hegi
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What the pack o.O Nice, I have to try that. 
Our webpage has been shut down forever cause nobody was willing to contribute. Shame on you all!!!
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