Difference between revisions of "White sapphire"
From apm
(→Related: added * '''Gemstone like compounds with high potential''') |
(added details and deltalumide polymorph) |
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Advantages: | Advantages: | ||
| − | * very hard material, very high heat conductivity | + | * very hard material (Mohs 9 – defining mineral), very high heat conductivity |
* made out of the extremely common element aluminum (more common than carbon) | * made out of the extremely common element aluminum (more common than carbon) | ||
* thermodynamically stable not just metastable thus very heat resistant | * thermodynamically stable not just metastable thus very heat resistant | ||
| − | + | ---- | |
| − | + | * Crystal structure: trigonal | |
| − | Crystal structure of less high symmetry than other interesting base materials. <br> | + | It is of slightly less high symmetry than other interesting base materials. <br> |
Maybe look at metastable polymorphs at the eventual cost of somewhat less heat resistance? | Maybe look at metastable polymorphs at the eventual cost of somewhat less heat resistance? | ||
| − | Note: The page uses leukosapphire instead of just sapphire because <br> | + | == Terminology == |
| − | just sapphire is often associated with a blue to black variant where the | + | |
| + | Note: The page uses the term "leukosapphire" instead of just "sapphire" because <br> | ||
| + | just sapphire is often associated with a blue to black variant where the color is caused by metal impurities. <br> | ||
A base material for [[gemstone metamaterial technology]] would be perfectly impurity free and colorless clear though. <br> | A base material for [[gemstone metamaterial technology]] would be perfectly impurity free and colorless clear though. <br> | ||
| − | Like a leukosapphire | + | Like a leukosapphire. Just even more clear. |
== Related == | == Related == | ||
| Line 26: | Line 28: | ||
[[Category:Base materials with high potential]] | [[Category:Base materials with high potential]] | ||
| + | |||
| + | == Polymorphs == | ||
| + | |||
| + | '''Deltalumite''' Al<sub>2</sub>O<sub>3</sub> (δ form of corundum, polymorph of [[sapphire]]) – tetragonal – Mohs ? – | ||
| + | |||
| + | * [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Deltalumite (on mineralienatlas.de)] | ||
| + | * [https://www.mindat.org/min-47933.html (on mindat.org)] | ||
| + | * [https://www.wikidata.org/wiki/Q27013457 (on wikidata)] | ||
| + | |||
| + | Paper: "Deltalumite, a new natural modification of alumina with spinel-type structure" | ||
| + | * Researchgate Jannuary 2019 [https://www.researchgate.net/publication/345362779_Deltalumite_a_new_natural_modification_of_alumina_with_spinel-type_structure] | ||
| + | * Researchgate December 2020 [https://www.researchgate.net/publication/349128285_Deltalumite_a_New_Natural_Modification_of_Alumina_with_a_Spinel-Type_Structure] | ||
| + | * [https://www.semanticscholar.org/paper/Deltalumite%2C-a-New-Natural-Modification-of-Alumina-Pekov-Anikin/403a9a67ff0454c5c562f9aa0ff2cdd142c31ac7/figure/3 (semanticscholar)] << Images! | ||
| + | |||
| + | How to spell this ?? | ||
| + | * Delt-alumite? | ||
| + | * Delta-lumite? | ||
| + | * Delta-alumite? | ||
== External links == | == External links == | ||
Revision as of 17:17, 18 June 2021
Advantages:
- very hard material (Mohs 9 – defining mineral), very high heat conductivity
- made out of the extremely common element aluminum (more common than carbon)
- thermodynamically stable not just metastable thus very heat resistant
- Crystal structure: trigonal
It is of slightly less high symmetry than other interesting base materials.
Maybe look at metastable polymorphs at the eventual cost of somewhat less heat resistance?
Terminology
Note: The page uses the term "leukosapphire" instead of just "sapphire" because
just sapphire is often associated with a blue to black variant where the color is caused by metal impurities.
A base material for gemstone metamaterial technology would be perfectly impurity free and colorless clear though.
Like a leukosapphire. Just even more clear.
Related
- Gemstone like compounds with high potential – Gemstone like compounds
- Corundum structure – Simple crystal structures of especial interest
- Aluminum oxides
- Tistarite Ti2O3 has the same structure.
- Moissanite is also an extremely heat resistant base material.
- Diamond is much less heat and oxidation resistant.
- Both diamond and moissanite have higher crystal structure symmetry than leukosapphire
Polymorphs
Deltalumite Al2O3 (δ form of corundum, polymorph of sapphire) – tetragonal – Mohs ? –
Paper: "Deltalumite, a new natural modification of alumina with spinel-type structure"
- Researchgate Jannuary 2019 [1]
- Researchgate December 2020 [2]
- (semanticscholar) << Images!
How to spell this ??
- Delt-alumite?
- Delta-lumite?
- Delta-alumite?
