The maximum variance of a condensed, isobaric three-component system is 3. In a two-dimensional representation, the variance that can be described is restricted to values of 0, 1, and 2. The usual presentation is of a projection of the saturation surface of the single-phase liquid. An area (Φ = 2) is a two-phase region; a line or curve (Φ= 1) is a three-phase equilibrium, and the intersection of lines at a point (Φ = 0) represents the isobaric invariance of four-phase equilibria. A projection of the liquidus onto a single plane is unambiguous if the solid crystallizing phase compositions are reasonably constant, as unique isothermal sections can be determined from the diagram information.
KeywordsPeritectic Reaction Univariant Curve Lever Rule Ceramic Process Univariant Boundary
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