“…The relatively higher UO 2 content together with the excellent phase flexibility make it an attractive host phase for actinide waste management, especially for spent nuclear fuels. 17 As such its synthesis, 18 crystal chemistry, [19][20][21] aqueous durability, [22][23][24][25] vibrational modes, 26,27 stability under pressure, 28 radiation damage, 29,30 actinide valence states, [31][32][33] thermal recrystallization of amorphous natural samples, 34 as well as the incorporations of neptunium and plutonium (Pu) have been extensively studied. 35 A stable titanate-based brannerite requires an overall tetravalent charge on the A-site of brannerite (ATi 2 O 6 ).…”