Question

Mention the type of compounds formed when small atoms like $H,C\text{and}N$ get trapped inside the crystal lattice of transition metals. Also give physical and chemical characteristics of these compounds.

Answer 1

• When small atoms like $H,C\text{and}N$ get trapped inside the crystal lattice of transition metals then the formation of interstitial compounds takes place.
• Interstitial compounds are non-stoichiometric compounds.
• Example: Stainless steel, $TiC$ etc

Physical and chemical characteristics of interstitial compounds:

• Interstitial compounds are closely packed thus, they possess high melting points as compared to other pure metals.
• Interstitial compounds are very hard because the voids of such compounds are occupied by other atoms.
• Interstitial compounds maintain their metallic conductivity.
• Interstitial compounds are chemically inert.