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Chemistry · Glossary

What is Defined compound?

Also known as: congruent melting

Definition 8.14 University Chemistry — Year 2 · Chapter 8 — Binary Solid–Liquid Diagrams

A defined compound is a solid of fixed composition AaBb\mathrm{A}_a\mathrm{B}_b formed by the two components. It shows congruent melting when it melts into a liquid of its own composition: the liquidus then has a maximum at that composition.

Schematic diagram with a defined compound AB_2 (vertical line at x_ B = 2/3) melting congruently at the maximum of the liquidus. The diagram is two simple eutectic diagrams side by side, with eutectics E_1 and E_2.
Schematic diagram with a defined compound AB2\mathrm{AB_2} (vertical line at xB=2/3x_{\mathrm B} = 2/3) melting congruently at the maximum of the liquidus. The diagram is two simple eutectic diagrams side by side, with eutectics E1_1 and E2_2.
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