One method often employed is to melt the reactants together and then later anneal thts are often put in an ampoule that is evacuated-often while keeping the reactant mixture cold e.g. by keeping the bottom of the ampoule in liquid nitrogen-and then sealed.
One method often employed is to melt the reactants together. Later anneal thts are often put in an ampoule. This ampoule is evacuated-often while keeping the reactant mixture cold e.g. by keeping the bottom of the ampoule in liquid nitrogen -. Later anneal thts are often then sealed.