Physical Chemistr Multicomponent Phase Compound Formation with Congruent Melting liquid-phase Miscibility and Solid-phase immiscibility The compound t/℃ formed: Mg,Si 1500 I(A+B) B1430 Mg(A) Si(c) S(C)+l(A+B) Mg2 Si(C)Si(B) 1000 I(A+B)+s(B S(C 650 E1 n compounds (A+B)+s(A)/(A+B S(C)+S(B) E,638 (n+ 1) phase diagrams 500 S(A)+S(C) 0.00.2040.60.81.0 Mg(A) Mg2 Si(C) Si(B)
11 Compound Formation with Congruent Melting Liquid-phase Miscibility and Solid-phase immiscibility xB 0.0 0.2 0.4 0.6 0.8 1.0 1500 1000 s(C)+s(B) l(A+B) t/℃ l(A+B)+s(B) E1 500 l(A+B)+s(A) Mg(A) Mg2Si(C) Si(B) s(A)+s(C) s(C)+l(A+B) E2 l(A+B) * A t * B t 1430 638 650 s(C) + The compound formed: Mg2Si Mg(A)⎯Mg2Si(C) Mg2Si(C)⎯Si(B) n compounds (n+1) phase diagrams Physical Chemistry Multicomponent Phase
Physical Chemistry Multicomponent Phase Hydrated-Compound Formation T/K C,. HSO..O e c: HSO2HO 273ka C2: HSO.HO 253 Each has its own melting point 233 E A combination of 4 213 simple eutectic E systems 193 (H2O) SO4
12 Hydrated-Compound Formation Physical Chemistry Multicomponent Phase C1 : H2SO4 4H2O C2 : H2SO4 2H2O C3 : H2SO4 H2O Each has its own melting point A combination of 4 simple eutectic systems