Wurtzite (crystal structure)
- Wurtzite (crystal structure)
:"For the mineral, see Wurtzite"
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.
Among the compounds that can take the wurtzite structure are wurtzite itself, AgI, ZnO, CdS, CdSe, α-SiC, GaN, AlN, and other semiconductors. In most of these compounds, wurtzite is not the favored form of the bulk crystal, but the structure can be favored in some nanocrystal forms of the material.
Each of the two individual atom types forms a sublattice which is HCP-type (short for "hexagonal close-pack"). 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 and pyroelectricity, which centrosymmetric crystals cannot.
External links
* [http://cst-www.nrl.navy.mil/lattice/struk/b4.html The Wurtzite structure]
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