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Corresponding HREM of Kr irradiated zirconolite at high temperature.
The diffuse diffraction spots are attributed to the short-range-order domains.

Reference: S.X. Wang, L.M. Wang and R.C. Ewing (1999) TEM study of short-range-order in zirconolite induced by high temperature ion irradiation. Microscopy and Microanalysis, vol. 5, supplement 2, 756-757.

Zirconolite (CaGdZr2O7) was irradiated by 1 MeV Kr+ at 673 K.
From the selected area electron diffraction patterns, arrays of diffuse maxima can be easily seen in the high temperature (above 673 K) irradiated samples. The diffuse scattering patterns are attributed to the short-range-order (SRO) domains.