The novel phases Rb_(4)NaU_(3)O_(12-x)F_(x)(1),K_(4)NaU_(3)O_(12-x)F_(x)(2),and Rb_(2.1)K_(1.9)KU_(3)O_(12-x)F_(x)(3)were synthesized by molten flux methods using mixed alkali fluoride melts.The oxyfluorides crystalli...The novel phases Rb_(4)NaU_(3)O_(12-x)F_(x)(1),K_(4)NaU_(3)O_(12-x)F_(x)(2),and Rb_(2.1)K_(1.9)KU_(3)O_(12-x)F_(x)(3)were synthesized by molten flux methods using mixed alkali fluoride melts.The oxyfluorides crystallize in the cubic space group Im3m with a lattice parameters of 8.7472(2)Å,8.6264(2)Å,and 8.8390(3)Å,respectively.All three structures crystallize in a cubic perovskite structure,ABO_(3)(A_(4)BB’_(3)O_(12)).展开更多
基金supported by the U.S.Department of Energy,Office of Basic Energy Sciences,Division of Materials Sciences and Engineering under Award DE-SC0016574C.Juillerat is additionally supported by an NSF IGERT Graduate Fellowship under grant number 1250052+1 种基金V.Kocevski and T.Besmann acknowledge the use computational resources provided by the National Energy Research Scientific Computing Center(NERSC)and the HPC cluster Hyperion,supported by The Division of Information Technology at University of South CarolinaXANES data collected on Beamline 10-BM-B at the Advanced Light Source,a U.S.Department of Energy(DOE)Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No.DE-AC02-06CH11357,and is directed by MRCAT and supported by the Department of Energy and the MRCAT member institutions.
文摘The novel phases Rb_(4)NaU_(3)O_(12-x)F_(x)(1),K_(4)NaU_(3)O_(12-x)F_(x)(2),and Rb_(2.1)K_(1.9)KU_(3)O_(12-x)F_(x)(3)were synthesized by molten flux methods using mixed alkali fluoride melts.The oxyfluorides crystallize in the cubic space group Im3m with a lattice parameters of 8.7472(2)Å,8.6264(2)Å,and 8.8390(3)Å,respectively.All three structures crystallize in a cubic perovskite structure,ABO_(3)(A_(4)BB’_(3)O_(12)).
