12007-84-0Relevant academic research and scientific papers
Synthesis of Binary and Ternary Actinide Compounds of High Purity to Yield their Oxides.
Larroque,Chipaux,Beauvy
, p. 487 - 496,487 - 496 (1986)
The synthesis of polycrystalline binary and ternary actinide compounds has been developed at CEN-Cadarache to provide samples for research on the physic Physical properties of 5f elements. These compounds, mainly borides and oxychalcogenides, have no magn
Thermophysical and mechanical property assessment of UB2 and UB4 sintered via spark plasma sintering
Kardoulaki,White,Byler,Frazer,Shivprasad,Saleh,Gong,Yao,Lian,McClellan
, (2020)
Uranium diboride (UB2) and uranium tetraboride (UB4) are candidate constituents for multi-phase accident tolerant fuel due to their anticipated high thermal conductivity. These fuels have high uranium density that contributes to fission, and by tailoring the ratio of 10B/11B, can also act as an integrated burnable poison. Understanding the thermophysical and mechanical properties of uranium borides, for which only limited data are available in the literature, is of importance to determine their accident tolerance. In this work UB2 and UB4 have been synthesized via arc melting and sintered to high densities via spark plasma sintering (SPS). High density samples, >90% theoretical density, were used to measure the thermal diffusivity and thermal expansion of UB2 and UB4 and, in conjunction with specific heat literature data, their thermal conductivities were calculated from 298 to 1773 K. Additionally, resonance ultrasound spectroscopy (RUS) and nanoindentation were performed to investigate the mechanical properties of the uranium borides. Our results are discussed in the context of available literature. Both UB2 and UB4 exhibit thermal conductivities higher than that of UO2, with UB2 having the highest. The thermal conductivity of UB2 increases with temperature above 874 K, while for UB4 there is a linear increase over the entire measured range. X-ray diffraction (XRD) results indicate that impurity phases were present in the fabricated materials, which could explain why literature density functional theory (DFT) results predict higher values. This suggests that if impurity phases or any microstructural defects can be eliminated then the thermal conductivity can be further increased.
Low-temperature synthesis of uranium tetraboride by solid-state metathesis reactions
Lupinetti, Anthony J.,Fife, Julie L.,Garcia, Eduardo,Dorhout, Peter K.,Abney, Kent D.
, p. 2316 - 2318 (2002)
A novel synthesis of uranium tetraboride (UB4) by solid-state metathesis reaction is demonstrated. This approach significantly lowers the temperature required to synthesize this material to ≤850 °C. When UCl4 is reacted with 2 equiv of MgB2 at 850 °C, crystalline UB4 is formed. Powder X-ray diffraction and ICP-AES data support the reduction of UCl4 to UCl3 as the initial step in the reaction. The UB4 product is purified by washing with water.
Thermoelectric properties of UB4 from 300 to 850 K
Nishi, Yoshimasa,Arita, Yuji,Matsui, Tsuneo,Iwasaki, Kouta,Nagasaki, Takanori
, p. 652 - 654 (2005)
Seebeck coefficient and the electrical conductivity for polycrystalline UnB (nB4: natural boron) were measured in the temperature range from 300 to 850 K. Seebeck coefficient increased with temperature from 8 μVK-1/s
