Why MgAl2O4 is a normal spinel?
Why MgAl2O4 is a normal spinel?
Spinels constitute a class of minerals of general type AB2X4, containing two cations A and B connected by anions X which is mostly oxygen. MgAl2O4 is the most prominent example and crystallizes as normal spinel structure because Mg2+ (71 pm) is much larger than Al3+ (53 pm, Shannon’s tetrahedral radii, [2]).
What is the structure of MgAl2O4?
mp-3536: MgAl2O4 (cubic, Fd-3m, 227)
What is magnesium aluminate used for?
As a refractory material, MgAl2O4 spinel has some unique applications in the form of sintered ceramics or coatings. It is considerably more resistant to slags and fluxes, especially alkalis, than alumina.
What is the name of MgAl2O4?
Spinel Powder (MgAl2O4)
What is normal spinel?
Normal spinel structures are usually cubic close-packed oxides with eight tetrahedral and four octahedral sites per formula unit. The tetrahedral spaces are smaller than the octahedral spaces. B ions occupy half the octahedral holes, while A ions occupy one-eighth of the tetrahedral holes.
Which of the following statement is are correct about spinel structure?
For the spinel structure (MgAl_(2)O_(4)), the correct statement is//are. 50%OVs are occupied by ions. Al3+ is equally distributed in TVs and OVs. 12.5%TVs are occupied by ions.
What is the formula of magnesium aluminate?
Magnesium Aluminate Properties (Theoretical)
| Compound Formula | Al2MgO4 |
|---|---|
| Molecular Weight | 142.27 |
| Appearance | White powder |
| Melting Point | N/A |
| Boiling Point | N/A |
What is the chemical formula of magnesium aluminate?
Is magnesium oxide organic or inorganic?
Magnesium oxide (MgO). An inorganic compound that occurs in nature as the mineral periclase. In aqueous media combines quickly with water to form magnesium hydroxide.
How do you know if spinel is normal and inverse?
If A+2 is Non transition metal and B+3 is transition metal (having d1 d2 d3 d4 d6 d7 d8 d9) then spinel will be NORMAL. If is transition metal with (d1 d2 d3 d4 d6 d7 d8 d9 ) and B is also transition metal with (d0 d5 and d10) system then spinel will be INVERSE.
What percentage of tetrahedral voids is occupied by mg2+ ions?
– Out of 8 tetrahedral spaces only 1 is filled by Mg atom, therefore percentage of tetrahedral voids occupied is 100/8 = 12.5 %.
