Difference between revisions of "Zincblende structure"
From apm
(added discussion of pseudo phase diagrams plus a lot more) |
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* '''SiC''' [[moissanite]] | * '''SiC''' [[moissanite]] | ||
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* '''α-ZnS''' [https://en.wikipedia.org/wiki/Sphalerite zinc sphalerite] - 4.2g/ccm . Mohs 3.5 to 4 (soft) | * '''α-ZnS''' [https://en.wikipedia.org/wiki/Sphalerite zinc sphalerite] - 4.2g/ccm . Mohs 3.5 to 4 (soft) | ||
* CdS [https://en.wikipedia.org/wiki/Cadmium_sulfide cadmium_sulfide] | * CdS [https://en.wikipedia.org/wiki/Cadmium_sulfide cadmium_sulfide] | ||
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| + | * are there other examples also forming [[pseudo phase diagram]] islands? | ||
== Pseudo phase diagrams surrounding SiC == | == Pseudo phase diagrams surrounding SiC == | ||
Revision as of 14:40, 24 April 2021
- SiC moissanite
- ZnSe Zinc_selenide stilleite - 5.42g/ccm - Mohs 5 - (Se is rare)
- α-ZnS zinc sphalerite - 4.2g/ccm . Mohs 3.5 to 4 (soft)
- CdS cadmium_sulfide
- are there other examples also forming pseudo phase diagram islands?
Pseudo phase diagrams surrounding SiC
All the carbon group elmenets can be substitutes.
The heavier ones likely only within bounds.
Like e.g. Lead carbide (biggest and smallest atoms of the group) is not achievable via thermodynamic means.
And it's unclear if even via [mechanosynthesis|mechanosynthetic]] means.
Rift between pseudo phase diagrams
SiC and ZnS have the same structure but there seems to be an unbridgable rift for pseudo phase diagrams.
With other nonmetals sulfur usually assumes bond order two (like oxygen above) but in ZnS it assumes bond order four.
Pseudo phase diagrams surrounding ZnS
Investigating the pseudo phase diagrams that emanate from ZnS
Replacing sulfur:
- Replacing all sulfur with oxygen (above S) likely not work since ZnO (zncite) is hexagonal.
- Replacing all sulfur with selenium (below S) works. thhis gives ZnSe Zinc_selenide (mineral stilleite)
Replacing Zinc:
Below Zinc there is cadmium and mercury both rare and toxic.
- CdS cadmium_sulfide has zinkblende structure => all psuedo polymorphs possible
- α-HgS cinnabarite wants to be trigonal rather than cubic
Misc
Also a very simple but different (odd) cubic structure: Cu2O cuprite.
