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Phase Diagram FAQ


The premier supplier of critically-evaluated phase diagrams for ceramic systems.



What is the ACerS-NIST Phase Equilibria Diagrams Program?

The program supports growth and progress in the ceramics and glass industry by providing relevant, critically-evaluated phase diagrams for oxides, non-oxides, salts, carbides, nitrides, borides, compound semiconductors, pnictides and chalcogenides. For over 60 years, the National Institute of Standards and Technology (NIST) and The American Ceramic Society (ACerS) have collaborated on the publication of evaluated phase diagrams for ceramic systems. The joint ceramic phase diagram program, representing a continuation and expansion of the effort to make ceramic phase diagram information readily and comprehensively available, began in December 1982.


How do I access ACerS-NIST Phase Equilibria Diagrams?

ACerS offers three convenient ways to access the critically-evaluated phase diagrams for ceramic systems:

  • Phase Equilibria Diagrams USB: Single or multi-user licenses
  • Phase Equilibria Diagrams Online: Library, single, or multi-user annual subscriptions
  • Phase Diagram Books: The Phase books are no longer being printed and will be sold on a first-come, first served basis. Own a part of history and get yours today here.

Ready to order? Click here to purchase your phase diagrams product.


Why are phase equilibria diagrams important?

Understanding phase equilibria in ceramic systems is central to the use and development of materials in refractories, glass, and other high-temperature technologies. Phase equilibria diagrams answer questions about flexibility and constraints of a ceramic or glass component in high-temperature or high-pressure environments. Phase boundaries also assist in the evaluation of the service stability of a ceramic material, both in the long and short time frames.  


For a step-by-step introductory text on the use and interpretation of phase diagrams, please purchase Introduction to Phase Equilibria in Ceramics by Clifton G. Bergeron and Subash H. Risbud. Download General Discussions of Phase Diagrams for free information on phase diagrams. General Discussion of Phase Diagrams [pages 5-36] by F.P. Hall, H. Insley, E.M. Levin, H.F. McMurdie and C.R. Robbins from Phase Diagrams for Ceramists, Volume I edited by E.M. Levin, C.R. Robbins and H.F. McMurdie.


Which ceramic systems are included in the phase diagram products?

Oxide and mixed systems with oxides – electrode processing, catalysis, electroceramics, magneto-resistors, thermistors, capacitors, nuclear fuel and nuclear waste, ionic conductors, fuel-cell electrolytes


Chalcogenides – semiconducting sulfides, selenides and tellurides for thermoelectrics, optoelectronics, photovoltaics


Pnictide systems – nitrides, phosphides, arsenides, bismuthides, and antimonides for bandgap-engineered optical materials, electron-transport devices, sensors, detectors, photovoltaics, thermoelectrics

Actinides – (U, Pu, Th)


Actinide-surrogates – (Ce)


Oxycation systems – molybdates and vanadates


Semiconductors – Si, Ge, Sn


Group 3 systems – B, Al, Ga, In, Tl


Salts – including mixed systems with salts


Which phase product is right for me

Phase Equilibria Diagrams PC Database, Version 4.2 USB offers two licenses. If you have a MAC, select the Phase Online option. 

  1. Single-user license – Select this license if you only need to access the phase diagrams from one computer.
  2. Multiple-user license – Select this license if you would like for up to 10 people in your organization to access concurrently.


Phase Equilibria Diagrams Online offers three types of licenses:

  1. Library or institution subscription – Select this option if you are an institution that wants to provide IP-based access to your clients.
  2. Single-user annual subscription – Select this option if you need only one license for an annual, password protected access to Phase Online. 
  3. Multiple-user annual subscription – Select this option if you have up to 10 people in your organization who need one-year password protected access to Phase Online. 

 Ready to order? Click here to purchase your phase diagrams product.


What are the system requirements for Phase Diagrams PC Database

Review the complete list of requirements and installation instructions


Minimum requirements:

  • Microsoft Windows XP or new (Windows 7 is recommended)
  • Minimum hard disk storage available: 4GB
  • Minimum CPU: Intel Core2 Duo, AMD Athlon X2 or better (dual core 1.867GHz or faster)
  • Minimum RAM: 2GB
  • Minimum Screen Resolution: SXGA (1280×1024)
More questions?

If your question isn’t answered here, contact Michelle Martin or Mark Mecklenborg for assistance.


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