Phase diagram (materials)

Native phase diagrams for materials science and thermodynamics. `type pt` (pressure × temperature) renders a single-component diagram with SCHEMATIC sublimation / vaporisation / fusion curves and labelled triple and critical points — the curve shapes are qualitative and identical for every substance; the declared temperatures and pressures set the point markers and their captions, not the paths between them. `type binary` renders a composition × temperature alloy diagram against a numeric temperature axis read from the two declared melting points, with schematic liquidus and solidus curves bridging them.