- Solidus (chemistry)
chemistry, materials science, and physics, the solidus is a temperature (a line on a phase diagram) below which a given substance is completely solid(crystallized). The solidus is applied, among else, to metal alloys, ceramics, and natural rocks and minerals.
The solidus quantifies the temperature at which
meltingof a substance "begins", but not necessarily the substance is melted "completely", i.e., the solidus is not necessarily a melting point. For this distinction, the solidus may be contrasted to the liquidus. The solidus and liquidus do not align or overlap in all cases. If a gap exists between the solidus and liquidus, then within that gap, the substance consists of solid and liquid phases simultaneously (like a "slurry"). Such is the case, for example, with the olivine( forsterite- fayalite) system.
eutecticmixtures the solidus and liquidus temperatures are identical, i.e., the mixture melts completely at one temperature, the eutectic point.
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