What is an Antifluorite structure?
What is an Antifluorite structure?
A crystal structure for ionic compounds of the type M 2 X, which is the same as the fluorite (CaF2) structure except that the positions of the anions and cations are reversed, i.e. the cations occupy the F− sites and the anions occupy the Ca2+ sites. Examples of the antifluorite structure are given by K2O and K2S.
What is meant by fluorite structure?
A type of ionic crystal structure in which the cations have an expanded face-centred cubic arrangement with the anions occupying both types of tetrahedral hole. The cations have a coordination number of 8 and the anions have a coordination number of 4.
What is fluorite and Antifluorite structure?
The antifluorite structure has ccplfcc anions with cations in all (T+ and T-) tetrahedral sites. The difference between antifluorite and fluorite is that anti- fluorite refers to an anion array with tetrahedral cations, whereas fluorite has the inverse arrangement with a ccp cation array and tetrahedral anions.
Which of the following have an Antifluorite structure?
The compound which possesses the antifluorite structure is. Some common substances with antifluorite structure are Na2O,Li2O,Rb2OandRb2S.
What is the structure of caf2?
Calcium fluoride is the inorganic compound of the elements calcium and fluorine with the formula CaF2….Calcium fluoride.
| Identifiers | |
|---|---|
| Crystal structure | cubic crystal system, cF12 |
| Space group | Fm3m, #225 |
| Lattice constant | a = 5.451 Å, b = 5.451 Å, c = 5.451 Å α = 90°, β = 90°, γ = 90° |
| Coordination geometry | Ca, 8, cubic F, 4, tetrahedral |
What is the structure of ZNS?
Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite….Zinc sulfide.
| Names | |
|---|---|
| Structure | |
| Crystal structure | see text |
| Coordination geometry | Tetrahedral (Zn2+) Tetrahedral (S2−) |
| Thermochemistry |
What is the structure of CaF2?
Is K2O an Antifluorite?
The antifluorite structure gets its name from the fluorite structure because it’s just the opposite i.e. the cations occupy the tetrahedral holes as compared to the anions in the fluorite structure. For example in K2O the cubic close-packing is made by oxide and the potassium occupy all 8 tetrahedral holes.
What is radius ratio of crystal?
This stability of the ionic crystals can be explained on the basis of radius ratio. Therefore, radius ratio is the ratio of cation to the ratio of an anion. Here, Ratio of cation= r, Ratio of anion = R. Thus, Radius ratio = (r/R). Limiting radius ratio helps in expressing the range of radius ratio.
What is the sum of coordination number of atoms present in Antifluorite?
As in case of the Antifluorite structure, it has FCC packing of anions. All tetrahedral sites are filled with cations so which clearly implies that coordination number of cations is 4. And since the coordination number of FCC structure is 12, therefore it implies clearly that the coordination number of anions is 8.
Is CaF2 basic?
CaF2 is slightly basic. The reason is HF is a weak acid ( but it is very corrosive). When dissolved in water, the F- ion formed will undergoes hydrolysis reaction with water molecules forming HF and OH-.
What is the structure of an antifluorite compound?
antifluorite structure Quick Reference A crystal structure for ionic compounds of the type M 2 X , which is the same as the fluorite (CaF 2 ) structure except that the positions of the anions and cations are reversed, i.e. the cations occupy the F − sites and the anions occupy the Ca 2+ sites.
How to inspect a na2o-antifluorite interactive 3D structure?
1 model in this collection. Use getProperty “modelInfo” or getProperty “auxiliaryInfo” to inspect them. while cations fill all tetrahedral holes. How useful was this page? Click on a star to rate it!
What kind of chemical is antimony trifluoride used for?
Antimony trifluoride is a white to gray crystalline solid, which is sometimes shipped as an aqueous solution. It is corrosive to tissue. It is used in ceramics and to make other chemicals.
What is an Antifluorite structure? A crystal structure for ionic compounds of the type M 2 X, which is the same as the fluorite (CaF2) structure except that the positions of the anions and cations are reversed, i.e. the cations occupy the F− sites and the anions occupy the Ca2+ sites. Examples of the antifluorite…