What compounds wurtzite structure?
Among the compounds that can take the wurtzite structure are wurtzite itself (ZnS with up to 8% iron instead of zinc), silver iodide (AgI), zinc oxide (ZnO), cadmium sulfide (CdS), cadmium selenide (CdSe), silicon carbide (α-SiC), gallium nitride (GaN), aluminium nitride (AlN), boron nitride (w-BN) and other …
What is the difference between zinc blende and wurtzite structure?
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.
How many zinc atoms are found in the wurtzite unit cell?
four atoms
When the nearest neighbor distance is the same in the wurtzite and zinc-blende structures, the lattice constants are related by az = -./2aw. For wurtzite, there are four atoms per unit cell in contrast to two for zinc-blende.
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 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 the geometry of ZnS crystal?
ZnS exists in two main crystalline forms, and this dualism is often a salient example of polymorphism. In each form, the coordination geometry at Zn and S is tetrahedral. The more stable cubic form is known also as zinc blende or sphalerite.
What kind of symmetry does the wurtzite have?
Wurtzite structure has basic hexagonal symmetry. It can be considered as being formed by the penetration of two hcp lattices (see Fig. 1.32). The two hcp lattices have the same axis (a3 –axis) but one of them is displaced with respect to the other. The wurtzite structure may be considered as an hcp structure with a basis of two atoms.
What kind of crystal is the ZnS Crystal?
If the sulfide ions originally adopt a cubic closest-packed structure, the ZnS crystal is zinc blende. The virtual reality displays depict the structure of wurtzite. The yellowspheres represent the sulfide ions and the bluespheres represent the zinc(II) ions.
How are atoms in a wurtzite crystal coordinated?
When viewed altogether, the atomic positions are the same as in lonsdaleite (hexagonal diamond ). Each atom is tetrahedrally coordinated. 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…
How many molecules are in a wurtzite cell?
The hexagonal wurtzite structure (or simply “wurtzite structure”) can be considered as formed by two interpenetrating hexagonal closed-packed lattices; in the unit cell there are four atoms of two different types, forming two molecules (see Figure 2.14 ). The primitive translation vectors and the basis vectors are.
