Superhard materials can be about classified into two categories: built-in compounds and acquired compounds. The built-in accumulation includes diamond, cubic boron nitride (c-BN), carbon nitrides and ternary compounds such as B-N-C, which acquire an congenital hardness. Conversely, acquired abstracts are those that accept superhardness and added automated backdrop that are bent by their microstructure rather than composition. An archetype of acquired superhard actual is nanocrystalline design accepted as aggregated design nanorods.
Several backdrop accept to be taken into annual if evaluating a actual as Superhard Material. While harder abstracts accept top aggregate moduli, a top aggregate modulus does not beggarly a actual is hard. Elastic characteristics accept to be advised as well, and microburst modulus ability even accommodate a bigger alternation with acerbity than aggregate modulus. Covalent abstracts about accept top bond-bending force constants and top microburst moduli and are added acceptable to accord superhard structures than, for example, ionic solids.
Diamond is an allotrope of carbon area the atoms are abiding in a adapted adaptation of face-centered cubic (fcc) anatomy accepted as "diamond lattice". It is accepted for its acerbity (see table above) and incompressibility and is targeted for some abeyant optical and electrical applications. The backdrop of alone accustomed precious stones alter too broadly for automated purposes, and accordingly constructed design became a above analysis focus.
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