CHAPTER X

SOLID SOLUTIONS. MIXED CRYSTALS 175

General, 175. Solution of gases in solids, 176. Palladium and hydrogen, 178. Solutions of solids in solids. Mixed crystals, 180. Formation of mixed crystals of isomorphous substances, 182. I. The two components can form an unbroken series of mixed crystals. (_a_) _The freezing points of all mixtures lie between the freezing points of the pure components._ Examples, 183. Melting-point curve, 183. (_b_) _The freezing-point curve passes through a maximum._ Example, 186. (_c_) _The freezing-point curve passes through a minimum._ Example, 188. Fractional {xiv} crystallization of mixed crystals, 188. II. The two components do not form a continuous series of mixed crystals. (_a_) _The freezing-point curve exhibits a transition point_, 190. Example, 190. (_b_) _The freezing-point curve exhibits a eutectic point_, 191. Examples, 192. Changes in mixed crystals with the temperature, 192.