This document discusses key concepts in phase diagrams including unary and binary phase diagrams. It defines important terms like system, phase, and phase equilibrium. It explains that unary phase diagrams show the relationship between a single component and variables like pressure and temperature. Binary phase diagrams illustrate the relationship between two components, temperature, and composition, and can reveal properties like complete solubility, partial solubility, and eutectic points. Gibbs' phase rule is also summarized, which relates the number of phases, components, and degrees of freedom in a system.
8. Gibbs Phase Rule
P + F = C + 2
F : degrees of Freedom
C : number of Components P + F = C +1
P : number of Phases For binary systems
9. Binary phase diagram
Common variables : P - T - C (composition)
P or T = Cte
Complete solubility
Binary system : Partial solubility
Insolubility have eutectic point
