Mg. Barker et Je. Gareh, A NOVEL REACTION BETWEEN PHYSICALLY SEPARATED SOLID REACTANTS, Journal of the Chemical Society, Chemical Communications, (24), 1994, pp. 2745-2746
Ternary oxides may be converted to ternary sulfides by a metathesis re
action with yttrium sulfide in a sealed, evacuated silica ampoule, eve
n when the reactants are physically separated.