Fig. 2: Conventional approach to determine the crystal structure of fission-product precipitates and Xe bubbles. | Communications Materials

Fig. 2: Conventional approach to determine the crystal structure of fission-product precipitates and Xe bubbles.

From: Identifying chemically similar multiphase nanoprecipitates in compositionally complex non-equilibrium oxides via machine learning

Fig. 2

a BFSTEM shows the microstructure of the transition region of the Limerick fuel. b Conventional TEM using the Fresnel contrast method can image the Xe bubbles but requires a longer time of operation. c A TKD map confirms the combination of both unrestructured (purple) grains and its surrounding submicron restructured grains, whereas only nanoscale Xe bubbles exist in the unrestructured grain. d SAED patterns show the matrix UO2 on zone axis 112. The minor diffraction spots are difficult to index because of the unknown structure of the small metallic fission-product precipitates (<70 nm). Examples were given to fit possible phases from literature25,53,54: BCC β-Mo (Tc, Ru) on zone axis 110, FCC α-Pd (Ru, Rh) on zone axis 112, and HCP ϵ-Ru (Mo, Tc, Rh, Pd) on zone axis \(11\bar{2}\)0.

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