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Experimental atomic radial distribution functions, obtained from diffraction amorphous materials, are proposed to be interpreted using the model curves built upon the complete structural data of crystal analogues or upon the separate fragments of their structure. This modelling technique is called a fragmentary model. A model atomic radial distribution function is a radial cross section of the spherically symmetric function of interatomic distances. It characterises a nanodispersed diffraction amorphous polycrystal as uniquely as the values of interplanar spacings and intensities characterise a regular polycrystal. Comparing the model and experimental atomic radial distribution functions by the maxima positions we can perform the “identification” and “phase analysis” of nanodispersed diffraction amorphous polycrystals and define the crystalline compounds whose fragments form the structure of glass.

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