Glossary of Terms for Phase Equilibria Diagrams
 Alkemade (Van Rijn van Alkemade) Theorem
The direction of falling temperature on the boundary curve of two intersecting primary phase
areas is always away from the Alkemade line. If the Alkemade line intersects the boundary
curve, the point of intersection represents a temperature maximum on the boundary curve.
If the Alkemade line does not intersect the boundary curve, then the maximum on the boundary
curve is represented by that end which if prolonged would intersect the Alkemade line.
Reference: Levin, E.M., McMurdie, H.F., and Hall, F.P., Phase Diagrams for Ceramists: Volume 1,
The American Ceramic Society, Columbus, Ohio, p. 5, 1956.
 Alkemade Line
In a ternary phase diagram a straight line connecting the composition points of two primary
phases whose areas are adjacent and the intersection of which forms a boundary curve.
Reference: Levin, E.M., McMurdie, H.F., and Hall, F.P., Phase Diagrams
for Ceramists: Volume 1, The American Ceramic Society, Columbus, Ohio, p. 5, 1956.
Some Examples of Alkemade Lines
