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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on UF5 by Materials Project

UF5 crystallizes in the tetragonal I4/m space group. The structure is one-dimensional and consists of two UF5 ribbons oriented in the (0, 0, 1) direction. U5+ is bonded to six F1- atoms to form corner-sharing UF6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are four shorter (2.03 Å) and two longer (2.27 Å) U–F bond lengths. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one U5+ atom. In the second F1- site, F1- is bonded in a linear geometry to two equivalent U5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UF5 by Materials Project

UF5 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. U5+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of U–F bond distances ranging from 2.02–2.36 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted linear geometry to two equivalent U5+ atoms. In the second F1- site, F1- is bonded in a single-bond geometry to one U5+ atom. In the third F1- site, F1- is bonded in a distorted linear geometry to two equivalent U5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UF5 by Materials Project

UF5 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. U5+ is bonded to seven F1- atoms to form corner-sharing UF7 pentagonal bipyramids. There are a spread of U–F bond distances ranging from 2.01–2.34 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one U5+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one U5+ atom. In the third F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two equivalent U5+ atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1979

Experimental setup for decomposition of UF6

The rate at which UF6 decomposes into UF5 and UF4 was determined as a function of neutron fluence. To study UF6 decomposition rate, an absorption cell for VUV and the associated VUV spectroscopy system was used to measure UF6 while under irradiation. The cell contains 50 torr of UF6 at room temperature to insure that the UF6 is in a gaseous state. It is shown that by determining the absorption coefficient below 2100A for UF6, above 2100A for F2, and at 4100A for cell degradation, UF6 decomposition can be measured at a neutron flux of 10 to the 12th power/sq cm for 72 continuous hours.

Rowe, M.↗