Phase Equilibria Diagrams Online Search

Welcome to the Phase Equilibria Diagrams Online Search system. Searching available diagrams is all that is open to the public. Please log in to get access to view the repository of diagrams. If you do not have an account you can purchase a subscription to the service at The American Ceramic Society Website

Search by Chemical System

Enter compounds and/or elements separated by spaces or hyphens.
This shows components that are not valid for searching the database.

Components may be invalid due to misspelling, incorrect delimiters between components, or because you have entered a component which is not included in the list of components that are available in the database.
Enter the search component manually or by selecting from the Component drop-down list below, using a space or hyphen if entering more than one (in any order). Enter the chemical symbols for elements correctly using appropriate upper- and lower-case letters. The database assumes that all numbers appearing in chemical formulas for compounds are subscripts. For example, to find all systems containing zirconium oxide, enter ZrO2, or Zr-O. To find all systems containing zirconium oxide, yttrium chloride, and sodium sulfate, enter ZrO2-YCl3-Na2SO4.

See the Help Page for Chemical System Designation rules, which determine the list of searchable components.

Chemical system classifications are designed generally to name the simplest possible chemical components and these are not necessarily the end-members of the diagram. Mixed compounds are not used in the assignment of chemical systems (with the exception of oxides of elements that are not solids at ambient temperature (e.g., C, N, S, CI), see the Help Page for Chemical System Designation rules). For example, BaTiO3, Mg2SiO4, KAlCl4, etc., do not appear in the chemical systems index and are not searchable components. The diagram MgSiO3-CaSiO3 will be classified by the simplest component oxides CaO-MgO-SiO2. The binary system NaAlCl4-KAlCl4 will be classified by the simplest component compounds NaCl-KCl-AlCl3. The simplest components are frequently those compounds that would be used in the laboratory to synthesize the more complex compound.
The user can narrow a search by entering a chemical element (e.g. O) and/or compounds (e.g. Al2O3) in the 'Not Containing' text box.

For example, entering Si-C and Containing, the least restrictive search logic, returns chemical systems such as C-O-Si, SiC-SiO2, SiC-Si3N4, C-N-Si, C-SiO2-Si3N4, SiC-SiO2-Si3N4, SiC-SiO2-Si3N4, C-SiO2-Si3N4, C-N-O-Si, C-O-Si, B-SiC, Si-SiC-T, C-Ni-S, C-SiC-SiO2-Si3N4, C-O-Si, H2-SiC, C-Nb-Si, Al-Be-C-SiC, C-Cr-Si, and Al-C-N-SiC-Si3N4.

An example of a combination of Not Containing components is O-N. This will result in the exclusion of any chemical system with oxygen, an oxide component (Al2O3, SiO2), elemental N, or an N-containing component (Si3N4).
Clicking this button will toggle the visibility of the information icons.

Clicking on an information icon will launch a dialog that will provide you with information about the feature found next to the icon.
This function will return a list of all published figures in the database. The list can be sorted by clicking the title bar for any of the columns (PED Figure No., PED Volume, Chemical System(s), Authors, or Publication Year). When sorted by Chemical System, the user obtains the electronic equivalent of the hard-copy Cumulative Indices that were previously published after each book was released. This new feature provides a shortcut - the user can display the same list by leaving the search "Components or Elements" field blank, choosing All from the PED Volume drop-down list, and clicking Search.

Search by Publication Characteristics

Checking this box will include entries in the INFO file in all search results. The INFO file contains approximately 3,000 entries of literature references that contain phase equilibrium information but, in general, no diagram (or a diagram that does not obey the phase rule). These papers have been retrieved from the archival literature during our systematic searches for new content for the database. Some papers may have data from which a diagram may be plotted, while in others only the results of a study, usually thermodynamic, are discussed. The list is by no means exhaustive because collecting and identifying references without diagrams was not systematic until the mid-1980's. Regardless, it was deemed useful to provide this information. Users should be aware that this file has not been checked in detail for accuracy by the data center staff. INFO entries, can be sorted and searched by Chemical System(s), Authors Last Name, and Publication Year. The default option is to exclude the INFO file.

The thumbnail diagram window shows a preview of the first diagram given in the PED figure selected in the main search results window on the left side of the interface. For figures with more than one diagram, the preview will display the diagram selected in the Diagram search results window located under the preview.

The preview diagram does not have labels, and is useful to display the type of diagram in the figure. For example, the chemical system designation for a figure with the binary diagram MgSiO3-CaSiO3 is CaO-MgO-SiO2, which would appear in the search return list. The preview diagram would indicate to the user that the diagram is for a binary, not a ternary system.
Please Login to View the PED Diagram
Selecting 'View Diagram' after selecting a diagram number in this search return list will launch the diagram interactively with the PED Viewer. All diagrams in the database can now be saved and printed as high quality .pdf, .jpg, or .png files using the Viewer option. Consult the Help file on the Viewer screen for instructions on each of the menu items along the top of the screen.

The PED Editor, completed in 2012, is part of new custom software now used by the Data Center to digitize all diagrams for this database. The PED Editor is downloadable for free, see https://www.nist.gov/srd/nist-standard-reference-database-31 and https://pages.nist.gov/PEDEditor/
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