Experimental assessment of thermophysical properties of (Pu,Zr)N

Basini, Virginie; Ottaviani, Jean-Pierre; Richaud, Jean-Christophe; Streit, M.; Ingold, F.

doi:10.1016/j.jnucmat.2005.04.040

Cited by 27 publications

(47 citation statements)

References 11 publications

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“…The experimental density values were then divided by the theoretical densities of the respective mixtures to obtain the percent theoretical densities (%TD). The theoretical densities of the mixtures were calculated from the reported theoretical densities of ZrN and DyN, which were 7090 [131] and 9930 [128] kg/m 3 , respectively. Table 8 shows that all of the samples obtained very high densities predicting that the sintering procedure allowed the samples to enter into the final stages of sintering.…”

Section: Results Of Sintering (Zr Dy)nmentioning

confidence: 99%

Synthesis and Optimization of the Sintering Kinetics of Actinide Nitrides

Butt¹,

Jaques²

2009

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Section: Results Of Sintering (Zr Dy)nmentioning

confidence: 99%

Synthesis and Optimization of the Sintering Kinetics of Actinide Nitrides

Butt¹,

Jaques²

2009

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“…2) The thermal conductivities of ZrN corrected to 100%TD, together with the reported values, 2,3,13,14) are shown in Fig. 5.…”

Section: Discussionmentioning

confidence: 95%

“…Thus, it can be surmised that the small temperature dependence of thermal conductivity resulted from the fact that the temperature dependence of the thermal conductivity of phonon and electron contributions canceled each other out. The large scattering of the thermal conductivity of ZrN seen in the literature 2,3,13,14) was thought to be derived from the difference in characteristics of the samples subjected to measurement. For example, the ZrN sample prepared by Basini et al The thermal conductivities of the Zr-based TRU nitride solid solutions corrected to 100%TD were fitted to a polynomial temperature equation, i.e., a þ b T þ c T 2 , using the least-squares method.…”

Section: Discussionmentioning

confidence: 99%

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Thermal Conductivities of Zr-based Transuranium Nitride Solid Solutions

Nishi¹,

Takano²,

Ichise³

et al. 2011

J. Nucl. Sci. Technol.

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In this study, the authors prepared sintered samples of (Zr 0:58 Pu 0:21 Am 0:21 )N, (Zr 0:80 Pu 0:10 Am 0:10 )N, and (Zr 0:70 Np 0:06 Pu 0:15 Am 0:075 Cm 0:015 )N solid solutions. The thermal diffusivities and heat capacities of these Zr-based transuranium nitride solid solutions were measured using a laser flash method and drop calorimetry, respectively. Thermal conductivities from 473 to 1,473 K were determined from the measured thermal diffusivity, heat capacity, and bulk density. The thermal conductivities of Zr-based transuranium nitride solid solutions were found to be higher than that of (Pu 0:5 Am 0:5 )N due to the high thermal conductivity of ZrN as the principal component, although they were lower than that of ZrN due to the impurifying effect of the transuranium elements. At 873 K, the thermal conductivities of ZrN, 9, 15.8, 25.5, 20.6, and 8.9 Wm À1 K À1 , respectively. In these results, the thermal conductivities of the Zr-based transuranium nitride solid solutions increased with increasing ZrN concentration.

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“…Due to this increased interest recent work has focused on assessing thermophysical properties of ZrN and mixed phases of actinide nitrides dispersed in ZrN. However difficulty in determining purity and stoichiometry of these materials has lead to much scatter in these properties with the bulk of experimental data being presented for commercially available powders [9][10][11][12][13]. Our work has shown that thermal conductivity of ZrC x N y ceramics increases with increasing nitrogen content [14].…”

Section: Introductionmentioning

confidence: 96%

On the fabrication of ZrC x N y from ZrO 2 via two-step carbothermic reduction–nitridation

Harrison

Rapaud

Pradeilles

et al. 2015

Journal of the European Ceramic Society

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This study examined the processing parameters of a two-step carbothermal reduction-nitridation of ZrO 2 as a UO 2 /PuO 2 simulant to fabricate ZrN. Variables studied were the reaction time, reaction temperature and the starting powder composition Higher temperatures, longer reaction times and higher initial amounts of carbon in the starting material lead to increased nitridation similar to previous work with uranium oxide but that reaction rate decreases with time. SEM and TEM of the reacted powders reveal regions of ZrC with ledges indicative of crystal defects with small particles of ZrN growing on the ZrC bulk material suggesting a reaction that occurs via Zr transport to the reaction site either through mass diffusion or evaporation-condensation of Zr (g) and with N 2(g) forming the nitride. Annealing experiments on these mixed phases shows formation of a solid solution is rapid compared to the nitridation, where there is no formation of a mixed phase.

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Experimental assessment of thermophysical properties of (Pu,Zr)N

Cited by 27 publications

References 11 publications

Synthesis and Optimization of the Sintering Kinetics of Actinide Nitrides

Synthesis and Optimization of the Sintering Kinetics of Actinide Nitrides

Thermal Conductivities of Zr-based Transuranium Nitride Solid Solutions

On the fabrication of ZrC x N y from ZrO 2 via two-step carbothermic reduction–nitridation

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