In chemistry, materials science, and physics, the solidus is the locus of temperatures (a curve 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 melting of 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.
This information originally retrieved from http://en.wikipedia.org/wiki/Solidus_(chemistry)
on Wednesday 3rd August 2011 9:29 pm EDT
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