Precipitation reactions 上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY Precipitation reactions a+B a+B A (i) B A Gii) B A (ii) B a'is metastable supersaturated solid solution ■ B is a stable (or metastable)precipitate ■ a is a more stable solid solution with the same crystal structure as a',but with a composition closer to equilibrium K.Chen 14K. Chen Precipitation reactions  α’ is metastable supersaturated solid solution  β is a stable (or metastable) precipitate  α is a more stable solid solution with the same crystal structure as α’, but with a composition closer to equilibrium Precipitation reactions 14