b'Table 1. MiniFuel U 3 Si 2specimens delivered to ORNL.Specimen ID Mass [g] Thickness [m] Diameter [mm]geometric%TD* geometric*[g/cm 3 ]35-P-19-039 0.0212 290 2.842 11.524 94.535-P-19-045 0.0179 250 2.823 11.439 93.835-P-19-047 0.0200 278 2.836 11.412 93.535-P-19-048 0.0190 266 2.811 11.510 94.335-P-19-051 0.0170 242 2.813 11.330 92.935-P-19-052 0.0178 244 2.821 11.652 95.535-P-19-054 0.0205 283 2.845 11.373 93.235-P-19-055 0.0189 271 2.801 11.329 92.9density (~12.2 g/cm3). PowderAccomplishments:x-ray diffraction and inert gas fusionEight MiniFuel high-density U 3 Si 2elemental analysis were respectivelyspecimens were fabricated and used to determine phase puritydelivered to ORNL for irradiation and oxygen-hydrogen-nitrogentests at the High Flux Isotope concentrations. Microstructures wereReactor (HFIR). Specimen densities examined using optical and electron(measured using geometric methods) microscopy to gauge overall sampleranged from 92.9% to 95.5% of the porosity, defects, and grain size.theoretical U 3 Si 2density (~12.2 g/Preliminary thermophysical propertycm3). Detailed sample specifications characterization involved laser flashare listed in Table 1. Microstructure analysis (LFA) to measure thermalexamination (see Figure 1) showed diffusivity and differential scanninggrain sizes 20 m (measurements calorimetry (DSC) to measure specificbased on the ASTM-E112 standard). heat capacity. Oxygen contents in the MiniFuel 72 2019|AFC ACCOMPLISHMENTS'