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NIST Standard Reference Database 31

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Version 4.5
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 4.5 (2021) 


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Phase Equilibria Diagrams, (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.

The Phase Equilibria Diagrams Database contains commentaries and more than 30,000 diagrams, including those published in all 21 hard-copy issues:  Volumes I through XIV ("blue books"); Annuals 91, 92, 93; High Tc Superconductors I & II; special‐Volume P (phosphorus‐containing); Zirconium & Zirconia Systems; and Electronic Ceramics I.  (Publication of hard‐copy books was discontinued after Vol. 14.)  The content includes experimental and calculated data 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.

Version 4.5 is 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/interactive-viewing program (PED Viewer/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, the Route scheduling system, and an object relational mapper for the GUI.  The user interface is browser‐based and includes help icons at each user‐input location.  The phase diagrams can be viewed and manipulated interactively; in addition, all PED Figures are available as complete .pdf files which are similar in quality to those in the previously printed books.  Users are able to perform keyword searches of the critical evaluations of all PED Figures, allowing them to associate material systems with any potential applications mentioned by Contributing Editors in the commentary text.  All graphics files can be printed or saved as high‐quality .pdf files.

Materials researchers please note: The PED Editor, developed at NIST by Eric Boesch, is available for free Download PED Editor and can be used (1) to digitize phase diagrams and (2) to extract data from phase diagrams or other two-dimensional scientific drawings. (The PED Editor is a custom-developed Java program which uses the iText open‐source PDF file generation library, Batik open‐source SVG file generation library, Jackson open‐source JSON file generation library, and the JAMA Java Matrix package.)

Version 4.5 provides 268 new entries with 720 new diagrams, many of which are recently studied systems for which no phase equilibrium information was previously available.  These systems include numerous complex salt systems containing Li and rare earth elements, ZnO-containing complex oxides and phosphates, mixed Li-based salt-oxides, transition-metal oxides containing rare earths, heavy-metal- (Tl, Te, Pb) or Li-containing semiconductors, transition-metal salt systems, and heavy-metal-containing salt systems.  These newly added diagrams reflect the need for data and emphasis of research efforts on challenges in emerging energy technologies, including corrosion issues in molten-salt Generation IV nuclear reactors, heat-transfer and/or -storage in nuclear as well as concentrated solar power, and development of next-generation batteries. 

Other new entries in Version 4.5 provide data pertinent to the recovery/recycling of rare earths; semiconducting systems for laser diodes, photoluminescence, solar cells, displays, chemical sensors, switches, thermoelectrics, and data-storage; non-linear optical materials; spintronics (topological insulators); photoelectrodes (mixed ionic-electrical conductors); photocatalysts; scintillators; thermal-barrier coatings; carbon-storage in the earth's mantle; metallurgical processing methods with reduced carbon emissions; electroceramics for dielectric applications; glass-ceramics for dental restoration materials; and advanced cement for oil wells.




Please note that use of the SRD31 product requires installation of Java™ SE version 8.  You can download the latest version at SRD31 will not operate with any other Java version such as OpenJDK or versions 9 or higher.  Please also note that beginning with Java 8 update 211, Oracle enacted the Oracle Technology Network (OTN) License Agreement for Java SE. The new license continues to permit certain uses at no cost (e.g. personal gaming). Other uses, including this application, now require the OTN License and a Java SE Subscription. Consult with your computer/software manager about your organization’s JAVA license status.


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] if you have questions.  

Download free demo version 4.5.

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: NISTSRD31DemoVersion4.4) (here). You will need to provide your shipping address.

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Single User full version - $1095.00 PLACE ORDER
Single User annual upgrade from Version 4.4- $275.00 PLACE ORDER
Single User Upgrade from Version 4.3 - $550.00 PLACE ORDER
Single User Upgrade from Version. 4.2 - $825.00 PLACE ORDER


Multiple User full version - $1895.00 PLACE ORDER
Multiple User annual upgrade from 4.4 - $475.00 PLACE ORDER
Multiple User annual upgrade from Version 4.3 - $950.00 PLACE ORDER
Multiple User annual upgrade from Version 4.2 - $1425.00  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]

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]

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 November 3, 2021