What are interstitial compounds ? How are they formed ? Give two examples.

Explanation

The compounds which are formed when small atoms like H, C or N are trapped inside the crystal lattices of metal are called interstitial compounds.
Eg : TiC, `Fe_(3)H, VH_(0.56)` etc.
`rarr` These are non stoichiometric and are neither typically ionic nor covalent.
`rarr` They have high melting points, higher than of pure metals.

`rarr` They are very hard, some borides approach diamond in hardness.
`rarr` They retain metallic conductivity.
`rarr` They are chemically inert.