A graphical 2D diffraction pattern, or Ring Pattern, can be produced for every entry in the icdd pdf-4+ database



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A graphical 2D diffraction pattern, or Ring Pattern, can be produced for every entry in the ICDD PDF-4+ database.

  • A graphical 2D diffraction pattern, or Ring Pattern, can be produced for every entry in the ICDD PDF-4+ database.



Each ring corresponds to a peak (d-spacing and intensity), calculated using the Crystallite Size parameter specified in the ‘Ring Pattern’.

  • Each ring corresponds to a peak (d-spacing and intensity), calculated using the Crystallite Size parameter specified in the ‘Ring Pattern’.

  • The higher the intensity, the brighter the ring.



The simulation assumes:

  • The simulation assumes:

    • No preferred orientation in the specimen
    • Uniaxial positioning of the detector (transmission geometry with incident beam centered)
    • Infinite number of randomly oriented crystallites


There are various preferences used to control how the Ring Pattern is calculated and displayed.

  • There are various preferences used to control how the Ring Pattern is calculated and displayed.



The Plot Size controls the detector dimensions (width and height in cm).

  • The Plot Size controls the detector dimensions (width and height in cm).

  • If the Ring Pattern is not visible on the form, try increasing the Plot Size.



The Camera Length controls the sample-to-detector distance (in cm).

  • The Camera Length controls the sample-to-detector distance (in cm).



The Crystallite Size parameter (in Å) affects the broadness of the rings.

  • The Crystallite Size parameter (in Å) affects the broadness of the rings.

  • Narrow rings correspond to larger Crystallite Sizes.



The Scale Background and Scale Font colors control the appearance of the Ring Pattern.

  • The Scale Background and Scale Font colors control the appearance of the Ring Pattern.



The Wavelength of the Ring Pattern can be set using the corresponding preferences.

  • The Wavelength of the Ring Pattern can be set using the corresponding preferences.

    • Use the Experimental preferences for experimental patterns.
    • Use the Calculated preferences for calculated patterns.








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