Difference between revisions of "White sapphire"
From apm
m |
m (merged redundant sections) |
||
| Line 1: | Line 1: | ||
| − | {{stub}} | + | {{stub}} __NOTOC__ |
| − | White sapphire (meaning clear transparent colorless) because we want to focus on perfect crystals without any color giving impurities. <br> | + | == Terminology == |
| − | Just "sapphire" usually refers to sapphires with impurities (iron and titanium ions replace aluminum ions) causing a blue color. <br> | + | |
| + | "White sapphire" (meaning clear transparent colorless) because we want to focus on perfect crystals without any color giving impurities. <br> | ||
| + | A base material for [[gemstone metamaterial technology]] would be perfectly impurity free and colorless clear. <br> | ||
| + | |||
| + | Just "sapphire" usually refers to sapphires with impurities (iron and titanium ions replace aluminum ions) causing a blue to black color. <br> | ||
Also called lecosapphire or leukosapphire (may be more prevalent in German). | Also called lecosapphire or leukosapphire (may be more prevalent in German). | ||
| − | + | == Advantages of this gem == | |
* very hard material (Mohs 9 – defining mineral), 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 in [[diamond]] or [[moissanite]]) | + | * made out of the extremely common element aluminum (more common than carbon in [[diamond]] or [[moissanite]]) <br><small>Possibly helpful on the [[Moon]] with carbon being scarce.</small> |
| − | * thermodynamically stable not just metastable thus very heat resistant | + | * like [[moissanite]] sapphire is thermodynamically stable not just metastable like [[diamond]] thus very heat resistant |
| − | + | * Crystal structure: trigonal – Not as high symmetry as cubic but still good. | |
| − | * Crystal structure: trigonal | + | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | Maybe look at metastable Al<sub>2</sub>O<sub>3</sub> polymorphs at the eventual cost of somewhat less heat resistance? | |
| − | + | ||
| − | + | ||
| − | + | ||
== Related == | == Related == | ||
Revision as of 12:11, 6 June 2023
Terminology
"White sapphire" (meaning clear transparent colorless) because we want to focus on perfect crystals without any color giving impurities.
A base material for gemstone metamaterial technology would be perfectly impurity free and colorless clear.
Just "sapphire" usually refers to sapphires with impurities (iron and titanium ions replace aluminum ions) causing a blue to black color.
Also called lecosapphire or leukosapphire (may be more prevalent in German).
Advantages of this gem
- very hard material (Mohs 9 – defining mineral), very high heat conductivity
- made out of the extremely common element aluminum (more common than carbon in diamond or moissanite)
Possibly helpful on the Moon with carbon being scarce. - like moissanite sapphire is thermodynamically stable not just metastable like diamond thus very heat resistant
- Crystal structure: trigonal – Not as high symmetry as cubic but still good.
Maybe look at metastable Al2O3 polymorphs at the eventual cost of somewhat less heat resistance?
Related
- Tistarite Ti2O3 has the same structure. => neo-polymorph series?
- Gemstone like compounds with high potential – Gemstone like compounds
- Corundum structure – Simple crystal structures of especial interest
- Aluminum oxides
- 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?
External links
Wikipedia
- materialsproject.org [3]
- mineralienatlas (de) [4]
- Strukturtypendatenbank uni-freiburg: [5]
- Wikidata leukosapphire: https://www.wikidata.org/wiki/Q3831236
