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How many atoms are in zinc blende unit cell?
Zinc Blende is the name given to the mineral ZnS. It has a cubic close packed (face centred) array of S and the Zn(II) sit in tetrahedral (1/2 occupied) sites in the lattice, giving a Unit Cell with 8 Zn and 16 S’s.
How many atoms are in a unit cell of ZnS?
Since the number of atoms in a single unit cell of Zn and S is the same, it is consistent with the formula ZnS. The ionic radius for Zn2+ is 74pm and for S2- is 190pm….Introduction.
| Site | Zn | S |
|---|---|---|
| Central | 4 | 0 |
| Face | 0 | 6(1/2) = 3 |
| Corner | 0 | 8(1/8) = 1 |
| Total | 4 | 4 |
How many formula units are there in zinc blende unit cell?
four formula units
The unit cell of zinc blend has four formula units of ${\text{ZnS}}$.
Is Zinc blende fcc or BCC?
Zincblende/sphalerite is based on a fcc lattice of anions whereas wurtzite is derived from an hcp array of anions. In both structures, the cations occupy one of the two types of tetrahedral holes present.
What is the coordination number of Zn in ZnS?
4
We know that the coordination number of zinc is 4 and sulphide ion in ZnS is face centered so its coordination number is also 4.
What is formula unit of zinc blende?
Zinc blende has fcc arrangement of S2−ions while wurtzite has hcp arrangement of S2−ions. A unit cell of zinc blende has 4 formula units while that of wurtzite has 6 formula units of ZnS.
Is zinc blende ionic?
Zinc sulfide crystallizes in two different forms: wurtzite and zinc blende. The ionic radius of the zinc(II) ion is 0.74 Å and that of the sulfide ion is 1.70 Å.
How do you find the coordination number in ZnS?
The coordination number is 4. You can also look at this structure as a hexagonal closest packed lattice of sulfur ions with half the tetrahedral holes filled with zinc ions. Both ZnS and ZnO can also form a face-centered cubic structure, called the zinc blende structure (which, for ZnS, is also called sphalerite).
How many atoms are in a zinc blende lattice?
Simply so, how many atoms are in zinc blende? or hexagonal structure Of course we see immediately that what many call Zinc blende or sphalerite is simply an fcc lattice with two atoms in the base: atom A at (0,0,0,) and atom B at (½, ½, ½). Similarly, what is the coordination number of Zn in ZnS? 4
How many ZnS are in a zinc blende?
Zinc Blende is the name given to the mineral ZnS. It has a cubic close packed (face centred) array of S and the Zn (II) sit in tetrahedral (1/2 occupied) sites in the lattice, giving a Unit Cell with 8 Zn and 16 S’s. The display shows an idealised unit cell (Space group 216 F-43m).
What kind of structure is a zincblende cell?
To recap, zincblende is best thought of as a face-centered cubic array of anions cations occupying one half of the tetrahedral holes. Each ion is 4-coordinate and has local tetrahedral geometry. Unlike wurtzite, zincblende is its own antitype — you can switch the anion and cation positions in the cell and it doesn’t matter (as in NaCl).
How is the zincblende structure similar to NaCl?
Notice that the (111) plane is identical to the (111) in NaCl. That’s not too surprising given that the anion lattice is identical. Unlike NaCl, the (100) plane of zincblende contains only anions. Look at Figure 4 — can you see how this cuts through the unit cell in Figure 1?