sentence: Chemists often melt the reactants together and then later anneal the solidified melt.
sentences_after: If volatile reactants are involved, the reactants are often put in an ampoule and then all air is removed. The sealed ampoule is then put in an oven and given a specified heat treatment.
concept_name: chemist
headings: Solid-state chemistry Synthetic methods Oven techniques Melt methods
categories: Chemistry