What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.

An alloy is a solid or solution of two or more elements in a metallic matrix. It can either be a partial solid solution or a complete solid solution. Alloys are usually found to posses different physical properties than those of the component elements.

An important alloy of lanthanoids is Mischmetal. It contains lanthanoids (4-95%), iron (5%) and traces of $S,C,Si,Ca$ and $Al$

Uses

(1) Mischmetal is used in cigarettes and gas lighters

(2) It is used in flame throwing tanks

(3) It is used in flame bullets and shills.