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Materials Data on ThF4 by Materials Project

ThF4 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Th4+ sites. In the first Th4+ site, Th4+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Th–F bond distances ranging from 2.33–2.40 Å. In the second Th4+ site, Th4+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Th–F bond distances ranging from 2.30–2.38 Å. There are seven inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two equivalent Th4+ atoms. In the second F1- site, F1- is bonded in a distorted linear geometry to two Th4+ atoms. In the third F1- site, F1- is bonded in a distorted linear geometry to two equivalent Th4+ atoms. In the fourth F1- site, F1- is bonded in a linear geometry to two Th4+ atoms. In the fifth F1- site, F1- is bonded in a bent 150 degrees geometry to two Th4+ atoms. In the sixth F1- site, F1- is bonded in a linear geometry to two equivalent Th4+ atoms. In the seventh F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two Th4+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on Th(NF2)4 by Materials Project

ThF4(NF)4 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of eight monofluoroamine molecules and one ThF4 ribbon oriented in the (1, 0, 0) direction. In the ThF4 ribbon, Th4+ is bonded in a 6-coordinate geometry to six F1- atoms. There are a spread of Th–F bond distances ranging from 2.11–2.40 Å. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Th4+ atom. In the second F1- site, F1- is bonded in a bent 120 degrees geometry to two equivalent Th4+ atoms. In the third F1- site, F1- is bonded in a single-bond geometry to one Th4+ atom. In the fourth F1- site, F1- is bonded in a water-like geometry to two equivalent Th4+ atoms.

36 MATERIALS SCIENCE↗

Thermal Property Measurements for an LEU-Fueled Molten Salt Reactor (Final CRADA Report)

Argonne performed thermodynamic modeling to predict eutectic compositions in the LiF-NaF-UF4 and LiF-NaF ThF4 systems. Three compositions each of LiF-NaF-UF4 and LiF-NaF-ThF4 molten salts were produced and the thermal properties between 400 and 600 °C were measured. One composition from each salt system was selected for measurements of heat capacity and thermal diffusivity across temperature ranges suggested by FEI experts as beneficial to industry.

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS↗