Chemistry — Phase: copper–lead (monotectic)
A monotectic system with a liquid miscibility gap.
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title "Copper-lead (monotectic)"
type binary
basis weight
component A "Cu" melting 1085
component B "Pb" melting 327
// Two invariant reactions, and the figure needs both: a monotectic at
// 36 wt% Pb and 955 C, where one liquid splits into a copper-rich solid
// and a second, lead-rich liquid, and a eutectic at 99.94 wt% Pb and
// 326 C, one twentieth of a degree below lead's own melting point.
monotectic 0.36 955
eutectic 0.9994 326
region "Liquid (one phase)" at (0.5, 0.95) color teal
region "L1 + L2 (immiscible)" at (0.55, 0.72) color amber
region "Cu + liquid" at (0.22, 0.52) color blue
region "Cu + Pb" at (0.6, 0.14) color purple