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Phase diagram

x axis energy other assessments tie-lines phase labels °C

Database details

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Phase diagrams are computed from each database with pycalphad (BinaryStrategy mapping, 298.15–4000 K at 1 atm, gas phases excluded) and drawn here from the resulting phase-boundary data — they are not images, so you can zoom into any part of one.

The datasets are the SGTE collection of binary datasets, compiled by Bengt Hallstedt — 2773 assessments of 1238 binary systems, including the five Landolt-Börnstein volumes (marked LB). Unary data from the SGTE Unary Database v5.0 (A. Dinsdale), as reformatted in that collection.

B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833. doi:10.1016/j.calphad.2025.102833 — published open access under CC BY 4.0. Please cite that paper if you use anything from this site.

Changes made to the source data: none to any thermodynamic parameter. The phase diagrams here are computed from the datasets as published; one file (the unary database) has a single invalid character in a reference-state label corrected so that it parses. Each diagram reflects only the assessment it was computed from — where two assessments of a system disagree, overlay them and see.