Glossary of Terms for Phase Equilibria Diagrams
- Solid Solution
A single crystalline phase which may be varied in composition within finite limits without
the appearance of an additional phase.
Reference: Levin, E.M., McMurdie, H.F., and Hall, F.P., Phase Diagrams for
Ceramists: Volume 1, The American Ceramic Society, Columbus, Ohio, p. 8, 1956.
Example of Solid Solution
- Solidus
The locus of temperature-composition points in a system at temperatures above which solid
and liquid are in equilibrium and below which the system is completely solid. In binary
diagrams without solid solutions, it is a straight line, representing constant temperature, and
with solid solutions, it is a curved line or combination of curved and straight lines. Likewise,
in ternary systems, the solidus is represented by a flat plane or curved surface, respectively.
Reference: Levin, E.M., McMurdie, H.F., and Hall, F.P., Phase Diagrams
for Ceramists: Volume 1, The American Ceramic Society, Columbus, Ohio, p. 8, 1956.
Example of Solidus
- Subsystem
Any portion of a binary, ternary, etc. system which can be treated as an independent binary
or ternary, etc. system. The selected substances designating the subsystem must be
components for the subsystem.
Reference: Levin, E.M., McMurdie, H.F., and Hall, F.P., Phase Diagrams
for Ceramists: Volume 1, The American Ceramic Society, Columbus, Ohio, p. 8, 1956.
- System
A system is that part of the universe that is chosen for study. The rest of the universe
is then called the surroundings. The choice of what to include in the system is completely
free, and is made to suit the purposes at hand.
Reference: Levin, E.M., McMurdie, H.F., and Hall, F.P., Phase Diagrams
for Ceramists: Volume 1, The American Ceramic Society, Columbus, Ohio, p. 8, 1956.
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