Laser melting of uranium carbides

Utton, Claire; Bruycker, F. De; Boboridis, K.; Jardin, R.; Noël, H.; Guéneau, C.; Manara, D.

doi:10.1016/j.jnucmat.2008.12.031

Cited by 50 publications

(25 citation statements)

References 6 publications

(10 reference statements)

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“…The laser melting technique has been successfully used to study several refractory systems such as uranium carbides10, uranium oxides11, plutonium oxides1213, uranium nitrides14 and zirconium carbides1516. The results obtained on compounds with already well-assessed phase transition temperatures are in good agreement with the literature data.…”

supporting

confidence: 76%

“…Therefore, the melting initiation is often easier to identify with the RLS signal. The noise observed after melting at the highest temperatures may in some cases be caused by boiling of the sample surface10. Since no further inflections were observed during heating or cooling it can be inferred that, within the current experimental uncertainties, TaC melts congruently and does not show further phase changes below the melting temperature.…”

Section: Resultsmentioning

confidence: 74%

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Investigating the highest melting temperature materials: A laser melting study of the TaC-HfC system

Cedillos-Barraza

Manara

Boboridis

et al. 2016

Sci Rep

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162

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TaC, HfC and their solid solutions are promising candidate materials for thermal protection structures in hypersonic vehicles because of their very high melting temperatures (>4000 K) among other properties. The melting temperatures of slightly hypostoichiometric TaC, HfC and three solid solution compositions (Ta1−xHfxC, with x = 0.8, 0.5 and 0.2) have long been identified as the highest known. In the current research, they were reassessed, for the first time in the last fifty years, using a laser heating technique. They were found to melt in the range of 4041–4232 K, with HfC having the highest and TaC the lowest. Spectral radiance of the hot samples was measured in situ, showing that the optical emissivity of these compounds plays a fundamental role in their heat balance. Independently, the results show that the melting point for HfC0.98, (4232 ± 84) K, is the highest recorded for any compound studied until now.

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supporting

confidence: 76%

Section: Resultsmentioning

confidence: 74%

Investigating the highest melting temperature materials: A laser melting study of the TaC-HfC system

Cedillos-Barraza

Manara

Boboridis

et al. 2016

Sci Rep

Self Cite

162

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“…As reported in the literature [8][9][10][11] monocarbide is face-centered cubic, and it is the most stable phase from room temperature up to 2526°C. Uranium sesquicarbide is cubic body centered and is metastable at low temperature [10].…”

Section: Introductionmentioning

confidence: 65%

Developing uranium dicarbide–graphite porous materials for the SPES project

Biasetto¹,

Zanonato²,

Carturan³

et al. 2010

Journal of Nuclear Materials

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“…[1][2][3][4] The perspective use of carbides as fuel for propulsion system 5 and for the next generation of nuclear reactors with high operating temperature is sparking renewed interest on their physical properties. [6][7][8][9][10] Three intermediate phases have been reported for the uranium-carbon system. The rocksalt NaCl-type structure exhibited by the monocarbide (UC) is stable over a narrow range of stoichiometric composition up to approximately 1100 K. 11,12 The dicarbide is substoichiometric, with composition ranging from UC 1.86 to UC 1.96 ; 13 below ∼2050 K, it crystallizes in the body-centered-tetragonal CaC 2 -type structure (α-UC 2 ), 12 whereas at higher temperatures it takes the KCNtype structure (β-UC 2 ), isomorphous to the monocarbide.…”

Section: Introductionmentioning

confidence: 99%

Evidence for persistent spin fluctuations in uranium sesquicarbide

et al. 2013

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The low-temperature magnetic susceptibility, heat capacity, and electrical resistivity of uranium sesquicarbide have been determined down to 2 K by combining measurements carried out on samples of U 2 C 3 , containing UC as minority phase, and on pure UC specimens. The presence of spin fluctuations with characteristic temperature T SF = 7 K is revealed by a nonanalytic contribution to the specific heat behaving (well below T SF ) as T 3 ln(T /T SF ), and confirmed by a T 2 increase of the electrical resistivity and a 1 − κT 2 decrease of the low-temperature magnetic susceptibility. The analysis of the specific-heat data above T SF provides a Debye temperature D ≈ 256 K and a moderate high value of the Sommerfeld coefficient, γ ≈ 42 mJ mol −1 U K −2 . The zero-temperature many-body enhancement of the electron mass is found to be m * /m ≈ 2.7. Our data rule out the occurrence of magnetic ordering in U 2 C 3 . First-principles electronic structure calculations support the absence of a magnetically ordered ground state but suggest that dynamical spin fluctuations are responsible for the electron mass enhancement.

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Laser melting of uranium carbides

Cited by 50 publications

References 6 publications

Investigating the highest melting temperature materials: A laser melting study of the TaC-HfC system

Investigating the highest melting temperature materials: A laser melting study of the TaC-HfC system

Developing uranium dicarbide–graphite porous materials for the SPES project

Evidence for persistent spin fluctuations in uranium sesquicarbide

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