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The Phase Equilibria Diagrams Database is the primary product of the long-standing cooperative effort between the National Institute of Standards and Technology (NIST) and the American Ceramic Society (ACerS) to provide high-quality phase diagram data to the technical community. The database features more than 23,000 phase diagrams, offers full commentary text and diagram diagram display, and includes 900 new figures and 1,400 new phase diagrams.