To prepare the sample for neutron scattering measurements, a 1.3(1) g sample of FLiBe was placed and melted in a vanadium canister and sealed with a flanged titanium lid and a graphite foil gasket. The sample was subsequently cleaned from beryllium contamination (below the free release limit of 0.2 µg/100cm 2 ). For X-ray scattering measurements, a sample of FLiBe (prepared from constituent Materion salts) was loaded and melted into a capped graphite insert then placed into a flame sealed quartz NMR tube. The Li enriched sample used in this study was believed to be approximately 99% enrichment, though the stock LiF was a legacy sample from ORNL and was not labeled with a numerical value. Readily available enriched Li from Sigma-Aldrich is available at 99%. We include a comparison between a 99% and 95% Li enriched sample in Fig. † by weighting the NNMD results.