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Title: Thermophysical properties of U 3 Si 5 to 1773 K

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Publication Date:
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
OSTI Identifier:
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 456; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-07-04 09:16:09; Journal ID: ISSN 0022-3115
Country of Publication:

Citation Formats

White, J. T., Nelson, A. T., Byler, D. D., Safarik, D. J., Dunwoody, J. T., and McClellan, K. J.. Thermophysical properties of U 3 Si 5 to 1773 K. Netherlands: N. p., 2015. Web. doi:10.1016/j.jnucmat.2014.10.021.
White, J. T., Nelson, A. T., Byler, D. D., Safarik, D. J., Dunwoody, J. T., & McClellan, K. J.. Thermophysical properties of U 3 Si 5 to 1773 K. Netherlands. doi:10.1016/j.jnucmat.2014.10.021.
White, J. T., Nelson, A. T., Byler, D. D., Safarik, D. J., Dunwoody, J. T., and McClellan, K. J.. Thu . "Thermophysical properties of U 3 Si 5 to 1773 K". Netherlands. doi:10.1016/j.jnucmat.2014.10.021.
title = {Thermophysical properties of U 3 Si 5 to 1773 K},
author = {White, J. T. and Nelson, A. T. and Byler, D. D. and Safarik, D. J. and Dunwoody, J. T. and McClellan, K. J.},
abstractNote = {},
doi = {10.1016/j.jnucmat.2014.10.021},
journal = {Journal of Nuclear Materials},
number = C,
volume = 456,
place = {Netherlands},
year = {Thu Jan 01 00:00:00 EST 2015},
month = {Thu Jan 01 00:00:00 EST 2015}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.jnucmat.2014.10.021

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Cited by: 18works
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  • An error was discovered by the authors in the calculation of thermal diffusivity in “Thermophysical properties of U 3Si 2 to 1773 K”. The error was caused by operator error in entry of parameters used to fit the temperature rise versus time model necessary to calculate the thermal diffusivity. Lastly, this error propagated to the calculation of thermal conductivity, leading to values that were 18%–28% larger along with the corresponding calculated Lorenz values.
  • Use of U 3Si 2 in nuclear reactors requires accurate thermophysical property data to capture heat transfer within the core. Compilation of the limited previous research efforts focused on the most critical property, thermal conductivity, reveals extensive disagreement. Assessment of this data is challenged by the fact that the critical structural and chemical details of the material used to provide historic data is either absent or confirms the presence of significant impurity phases. This study was initiated to fabricate high purity U 3Si 2 to quantify the coefficient of thermal expansion, heat capacity, thermal diffusivity, and thermal conductivity from roommore » temperature to 1773 K. Here, the datasets provided in this manuscript will facilitate more detailed fuel performance modeling to assess both current and proposed reactor designs that incorporate U 3Si 2.« less
  • The heat capacity of the perovskite high-{ital T}{sub {ital C}} superconductor YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} was measured from 5.3 to 350 K in an adiabatic calorimetric cryostat. A break in the heat-capacity curve, associated with the critical temperature for superconductivity was observed between 90.09 and 92.59 K. The transition temperature was identified as 91.44 K, and {Delta}{ital C}{sub {ital p},{ital m}} was calculated to be 0.559{ital R} at that temperature. The lattice heat capacity was evaluated by means of the recently developed Komada/Westrum phonon distribution model and the apparent characteristic temperature {Theta}{sub KW} was calculated to be 107.7 K. Themore » excess electronic heat capacity for the superconducting phase was evaluated and the energy gap was identified as 234. {ital R} K. Excess contribution, resulting from magnetic impurities, was noted below 20 K. Thermodynamic properties at selected temperatures are presented.« less
  • After melting and quenching, the ternary silicides U[sub 2]Fe[sub 17[minus]y]Si[sub y] exist for 3.3 [le] y [le] 4.5 but they partially decompose after annealing at 850-900[degrees]C. Their crystal structure, determined by X-ray diffractometry on both single crystals and powder, derives from the hexagonal Th[sub 2]Ni[sub 17]-type but depends strongly on the silicon content. For y = 3.7 some uranium sites are partially replaced by pairs of iron atoms and conversely. This structure shows some similarities to that observed for the binary compound Ho[sub 2]Fe[sub 17]. On the other hand, for y = 4.2, all the uranium atoms and pairs ofmore » iron atoms are statistically distributed. In contrast, the ternary silicide U[sub 2]Co[sub 15]Si[sub 2], which is obtained as single phase after annealing at 850[degrees]C, adopts the Th[sub 2]Ni[sub 17]-type structure. In all compounds, iron or cobalt atoms of the pair are never substituted by silicon atoms. 13 refs., 6 figs., 4 tabs.« less