Is ZnS wurtzite?
Zinc sulfide (ZnS) is a unique compound that forms two types of crystalline structures. These two polymorphs are wurtzite and zincblende (also known as sphalerite). Wurtzite has a hexagonal structure, while zincblende is cubic.
What is wurtzite lattice?
The wurtzite crystal structure, named after the mineral wurtzite, is a crystal structure for various binary compounds. It is an example of a hexagonal crystal system. The chemical prototype is conventionally given as ZnS.
What is hexagonal wurtzite structure?
Wurtzite structure has basic hexagonal symmetry. It can be considered as being formed by the penetration of two hcp lattices (see Fig. 1.32). In the wurtzite structure, the atoms are also arranged with tetrahedral symmetry, that is, an atom has four 1NN atoms of another kind and twelve 2NN atoms of the same kind.
What is the difference between zinc blende and wurtzite?
Zinc blende and wurtzite are two forms of zinc sulfide. However, the key difference between zinc blende and wurtzite is that zinc blend is cubic, whereas wurtzite has a hexagonal structure. Further, the density of zinc blende is higher than wurtzite.
Is wurtzite an FCC?
Assertion: Zinc blende and wurtzite both have fcc arrangement of S^2 – ions. Reason: A unit cell of both has four formula units of ZnS.
What does wurtzite mean?
: a brownish black mineral ZnS that consists of zinc sulfide in hemimorphic hexagonal crystals or a fibrous state and that is polymorphous with sphalerite.
What is Wurtzite formula?
Nonmagnetic, non-radioactive. References. Wurtzite is a zinc and iron sulfide mineral ((Zn,Fe)S), a less frequently encountered structural polymorph form of sphalerite. The iron content is variable up to eight percent.
Is Wurtzite an FCC?
What is the formula of Wurtzite?
|Formula (repeating unit)||(Zn,Fe)S|
How many tetrahedral voids are in ZnS?
– Like ZnS in diamond Carbon occupies half of the tetrahedral voids or holes. – The total number of tetrahedral voids in fcc is 8. – Out of 8 voids, carbon occupies half of it means four. – Therefore the percentage of occupancy of the tetrahedral void by carbon in the diamond is 50%.
Where is Wurtzite found?
Wurtzite, a zinc sulfide mineral that occurs typically in Potosí, Bolivia; Butte, Mont.; and Goldfield, Nev.
What does Wurtzite mean?
What is the lattice constant of P63mc?
The crystal structure of ZnO belonging to space group P63mc is characterized by the interconnection of two sub-lattices made of Zn +2 and O −2 in such a way that each Zn +2 ions is surrounded by four O −2 ions and vice-versa. The lattice constant is a = 3.25 Å and c = 5.206 Å.
What is the chemical prototype of wurtzite called?
The chemical prototype is conventionally given as ZnS, although mineral wurtzite is a multi-component alloy compound. The wurtzite crystal structure is referred to by the Strukturbericht designation B4 and the Pearson symbol hP4.
What kind of properties does a wurtzite have?
The wurtzite structure is non-centrosymmetric (i.e., lacks inversion symmetry). Due to this, wurtzite crystals can (and generally do) have properties such as piezoelectricity and pyroelectricity, which centrosymmetric crystals lack.
What is the empirical formula for the wurtzite crystal structure?
In materials with more than one crystal structure, the prefix “w-” is sometimes added to the empirical formula to denote the wurtzite crystal structure, as in w-BN . Each of the two individual atom types forms a sublattice which is HCP-type (short for “hexagonal close-packed”).