How many atoms are there in a zinc blende unit cell?
How many atoms are there in a 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.
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 type of cell is ZnS?
2. What type of unit cell is ZnS? Zinc sulfide (ZnS) is a unique compound that forms two types of crystalline structures. Zinc Sulphide is an ionic compound of AB type, i.e it contains two ions of ratio 1:1.
What is a zinc blende?
Summary: Zinc blend is a compound that comes in two forms: sphalerite and wurtzite. These are characterized by a 1:1 stoichiometric ratio of Zinc to Sulfur. It maintains a tetrahedral arrangement in both forms.
Why is zinc blende fcc?
In the zinc blend structure the sulphur ions form an fcc structure and the zinc ions occupy half of the tetrahedral sites in this structure to attain charge neutrality. The crystal has a lattice parameter of 0.541 nm.
What is the difference between zinc blende and diamond structure?
The key difference between zinc blende and diamond structure is that zinc blende has both zinc and sulfur atoms in its structure while diamond structure has only carbon atoms in its structure. The structure of zinc blende crystals closely resembles the structure of diamond.
Why is zinc blend fcc?
Is zinc a blende ore?
The molecular formula of zinc blend is ZnS. Zinc blende is an ore. Any metal can be extracted by following two major steps: Conversion of the ore into metallic oxide.
Where did zinc blende come from?
The sphalerite is composed of zinc sulfide (ZnS, Fig. 1.49) is the primary and principal source of zinc metal. The majority of the sphalerite deposits belong to sedimentary exhalative (SedEx) origin.
How are the cations arranged in the unit cell zinc blende?
In zinc blende structure, anions are arranged in ccp and cations are present in the tetrahedral voids and only half the tetrahedral voids are occupied.
What is the Bravais lattice of zinc blende?
fcc Bravais lattice
Zincblende has a fcc Bravais lattice with two atoms in the basis. The conventional unit cell is a cube with sides of a. There are 4 S atoms (corners: 8 × ⅛ = 1, faces: 6 × ½ = 3) and 4 Zn atoms (interior) in the conventinal unit cell.
Is zinc blende a semiconductor?
Zinc-blende semiconductor consists of two interpenetrating face-centered-cubic lattices, one having a group-III element atom (e.g. Ga), and the other a group-V element atom (e.g. As).
Why do zinc blende and wurtzite have different structures when both are ZnS?
Since zinc blend is more thermodynamically stable than wurtzite, the wurtzite form tends to convert into zinc blend slowly. The key difference between zinc blende and wurtzite is that zinc blend is cubic, whereas wurtzite has a hexagonal structure.
Why is it called zinc blende?
The alternative names blende and zinc blende, from the German word meaning “blind,” similarly allude to the fact that sphalerite does not yield lead. For detailed physical properties, see sulfide mineral (table).
Is zinc blende an ore?
Solution: Option (a) is the answer. Zinc blende (also known as zinc sulphide or ZnS) is a zinc sulphide ore.
How are the anions arranged in the unit cell ZnS?
Is ZnS a semiconductor?
ZnS is a group of II–VI wide band gap semiconductor materials with a band gap, which range between 3.6-3.8 eV. The ZnS has two types crystal structures namely zinc blende and wurtzite.
How is ZnS formed?
Zinc sulfide is usually produced from waste materials from other applications. Typical sources include smelter, slag, and pickle liquors. It is also a by-product of the synthesis of ammonia from methane where zinc oxide is used to scavenge hydrogen sulfide impurities in the natural gas: ZnO + H2S → ZnS + H2O.
What happens when zinc blende is roasted?
Answer. Ore of Zinc Blende is roasted in air (oxygen) to obtain Zinc Oxide.
How many atoms are in zinc blende unit cell?
How many atoms are in zinc blende unit cell? How many atoms are in zinc blende unit cell? Answers: Four of each atoms are present in a unit cell. Besides, how many atoms are in zinc blende?
What is the molecular geometry of zincblende?
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.
Does zincblende have anion lattice?
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?
How many types of zincblende are there?
The Zincblende (ZnS) Structure General Notes ZnS occurs in two common polytypes, zincblende (also called sphalerite) and wurtzite. The two types have these features in common: a 1:1 stoichiometry of Zn:S a coordination of 4 for each ion (4:4 coordination)
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