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NIST Standard Reference Database 31

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Version 5.1
NIST Standard Reference Database 31


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ACerS-NIST Phase Equilibria Diagrams Database: (formerly known as Phase Diagrams for Ceramists)

The Phase Equilibria Diagrams PC Database, Version 5.1 (2023) 


AcerS NIST Phase Version 5.1



Phase Equilibria Diagrams, (PED, Standard Reference Database SRD 31), published from 1964 to 1992 as the well-known Phase Diagrams for Ceramists "blue books", is the result of a long-standing collaboration between NIST and The American Ceramic Society to develop and maintain a state-of-the-art database of critically evaluated phase equilibria data for industrial and academic customers. The diagrams serve as maps of the equilibrium chemical and structural behaviors exhibited by materials (non-organic, non-metallic) and provide critical starting information for the rational design of processing schemes, for quality assurance efforts, for optimization of physical and chemical properties, and for the development of new materials.

This comprehensive, searchable PED application includes all content previously published in all 21 hard-copy books (Phase Diagrams for Ceramists; Phase Equilibria Diagrams; special-issue topical volumes). In 2005 (post Volume 14) publication transitioned to all-electronic; the latest content-update, Volume 24, is provided in this release of the database. Version 5.1 provides over 32,000 phase equilibrium diagrams that provide fundamental information needed to discover or optimize materials for numerous applications ranging from semiconductors to cement to biomarkers. The data include experimental and calculated diagrams for a wide range of non-organic material-types including oxides and mixed systems with oxides, chalcogenides (sulfides, selenides, tellurides), pnictides (N, P, As, Sb, Bi), actinides (U, Pu, Th) and actinide-surrogates (Ce), oxy-cation systems (e.g. molybdates, vanadates), semiconductors (Si, Ge, Sn), group-3 systems (B, Al, Ga, In, Tl), and salts including mixed systems with salts.  New content for SRD31 is extracted from the primary scientific literature on a bimonthly basis; NIST guidelines are then used by subject-matter experts to write critical evaluations of the work and to standardize presentation of the diagrams.

As in the pervious version, v 5.1 features the new JavaScript PED diagram viewer for interactive display of the diagrams.  The PED application no longer requires the installation of Java, although diagrams can still be downloaded and opened using the legacy (Java-based) PED Viewer.  The search interface is very similar to the previous series-4 versions and functions with the same software that resulted from a comprehensive upgrade of the content management system (CMS), the user interface, and the graphics digitization program (PED Editor). The new CMS is a custom-developed web-based system running under Ubuntu Linux using the Ruby programming language. The system uses Nginx web server, an SQLite database, and an object relational mapper for the GUI.

Materials researchers please note: The PED Editor digitization program is available for free download and can be used 1) to digitize phase diagrams and 2) to extract data from phase diagrams or other two-dimensional scientific drawings - see and Download PED Editor 

As in the series-4 versions, the search interface is browser-based and includes help icons at each user-input location. In addition to the previously available search criteria (chemical system, author, etc.) users are now able to perform keyword searches of the critical evaluations of all PED Figures, allowing them to associate material systems with potential applications mentioned in the text. All PED Figures are available as printable .pdf files which provide the commentary text as well as all diagrams, similar to the previous entries in the hard-copy books. In addition, all phase diagrams in the collection can be interactively displayed using the PED Viewer, and can be printed as high-quality .pdf files or downloaded as .png or .jpg files with customized resolution.

Materials covered by this database are used across a broad spectrum of technologies in applications such as optoelectronics, thermal-barrier coatings, chemical sensors, energy converters, solar cells, nuclear-waste reprocessing, nuclear-reactor technology, photovoltaics, pigments, fuel cells, catalysts, thermoelectrics, capacitors, transducers, thermoluminescence, batteries, photovoltaics, video displays, lasers, spintronics, data- storage, electrolytic refining, metallurgical processing, semiconductor manufacturing, bioceramics, and dental restoration.

The Version 5.1 content-update provides Volume 25, with 157 new Figures and 663 new diagrams – 117 of which are for material-systems not previously covered by the PED database. The new content in this version reflects the explosion of research on the fundamental properties of materials needed to enable the transition to energy technologies that do not depend on fossil fuels. New chemical systems and diagrams in v.5.1 are dominated by results from studies to develop low-cost, highly abundant, chemically stable materials for energy applications and include: complex salt systems for advanced nuclear reactors (fuels, coolants), concentrated solar power (heat-transfer/storage), batteries, and fuel-cells; mixed oxide/non-oxide systems for electrodes (batteries, fuel-cells, photovoltaics); chalcogenide systems for electronic-ionic conductors (batteries, sensors); and semiconductor systems for solar-photovoltaics. New diagrams added here also reflect increased research on the recycling/recovery of critical metals including rare earths, Sc, and key transition metals, as well as an uptick in studies of systems for ultra-lightweight structural materials for aerospace applications.






There will be a minimum $30.00 shipping charge for all international shipments of databases via UPS International. Customer will be responsible for their own duties, tax, and VAT. Contact (844) 374-0183 (Toll Free) or data [at] (data[at]nist[dot]gov) if you have questions.  

Download free demo version 5.1.

The free demonstration version contains the same functionality as the full version, but with limited content consisting of the 202 figures published in the Phase Diagrams for Ceramists: Annual '92, and 11 figures from Volume 15.  In addition, the demonstration version serves as a searchable, comprehensive chemical index for the entire database.

If you would like to receive a free demonstration-version disk, please click data [at] (Subject: NISTSRD31DemoVersion5.0) (here). You will need to provide your shipping address.








Single New - $1295.00 PLACE ORDER
Single User Upgrade from 4.3 or older  - $1135.00 PLACE ORDER
Single User Upgrade from Version 4.4 -$845.00 PLACE ORDER
Single User Upgrade from Version 4.5 - $565.00 PLACE ORDER
Single User Upgrade from Version 5.0 - $155.00 PLACE ORDER


New Multiple User  -$2495.00 PLACE ORDER
Multiple User Upgrade from 4.3 or older - $2055.00 PLACE ORDER
Multiple User Upgrade from 4.4 - $1545.00 PLACE ORDER
Multiple User Upgrade from Version 4.5 - $1025.00 PLACE ORDER
Multiple User Upgrade from Version 5.0 - $295.00  PLACE ORDER


For more information please contact:

National Institute of Standards and Technology
Standard Reference Data Program
100 Bureau Dr., Stop 6410
Gaithersburg, MD 20899-6410
(844) 374-0183 (Toll Free)

For information on ordering books, or Phase Online:
Contact ACerS Customer Service Department at:
The American Ceramic Society (ACerS)
550 Polaris Parkway, Suite 510
Westerville, OH 43082
Phone: 1- 866-721-3322 or 240-646-7054
Email: customerservice [at] (customerservice[at]ceramics[dot]org)

The scientific contact for this database:
Terrell Vanderah, Editor-in-Chief 
Phase Equilibria Diagrams Data Center
National Institute of Standards and Technology
MS 8520, 100 Bureau Drive
Gaithersburg, MD 20899-8580
(301) 975-5785 terrell.vanderah [at] (terrell[dot]vanderah[at]nist[dot]gov)

Keywords: Advanced ceramics; ceramic; ceramic phase diagrams; phase diagrams; phase equilibria; phase equilibrium; phase equilibrium diagram; inorganic materials; NIST Practice Guides; PED Editor; Phase Diagrams for Ceramists

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Created October 23, 2013, Updated March 29, 2023