Structure, Electrical Resistivity and Superconductivity of Low-alloyed γ-U Phase Retained to Low Temperatures by Means of Rapid Cooling

Krupska, M.; Kim-Ngan, N.-T.H.; Sowa, S.; Paukov, M.; Tkach, I.; Drozdenko, Daria; Havela, L.; Tarnawski, Z.

doi:10.1007/s40195-016-0400-7

Cited by 19 publications

(10 citation statements)

References 37 publications

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“…5). We notice here that U-15 at.% Pt splat has the lowest superconducting transition temperature (the main transition at 0.61 K) among all investigated U-T splats with γ-U structure [43]. For the as-cast bulk U-15 at.% Pt sample, a sharp drop in the ρ(T) curve was observed at a critical temperature T c = 1.04 K (with ∆T ρ = 0.05 K).…”

Section: Superconductivity In U-15 At% Ptmentioning

confidence: 62%

γ-U phase in U-Pt system retained to low temperatures by means of rapid cooling

Kim-Ngan

Paukov

Tarasenko

et al. 2016

Journal of Nuclear Materials

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Section: Superconductivity In U-15 At% Ptmentioning

confidence: 62%

γ-U phase in U-Pt system retained to low temperatures by means of rapid cooling

Kim-Ngan

Paukov

Tarasenko

et al. 2016

Journal of Nuclear Materials

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“…Transport properties of the alloys with traces of α-U are not shown. U 0.70 Ti 0.30 and U 0.20 Ti 0.80 alloys exhibit relatively narrow transition, with the width ΔT = 0.2 K, nevertheless, it is much wider than the transition observed in the ultrafast-cooled U-alloy with 15 at.% Mo with ΔT = 0.02 K [2]. The width here may be related to the small inhomogeneity in the Ti distribution ( Fig.1.…”

Section: Superconductivity Of the Ti-rich Alloymentioning

confidence: 80%

“…The transition temperatures span relatively broad temperature range. The alloy with 30 at.% Zr superconducts below 0.81 K, on the other hand U alloy with 15 at.% Mo has a higher critical temperature T c = 2.11 K [2]. Specific heat measurements indicate enchantment of the Sommerfeld coefficient of electronic specific heat.…”

Section: Introductionmentioning

confidence: 92%

Anomalous Superconductivity of the U-Ti Alloys

Buturlim

Koloskova

Minárik

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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bcc U-Ti alloys represent type-II superconductors with transition temperatures exceeding 1 K. The highest temperature was observed for the alloy with 80 at.% of Ti (T c = 3.74 K). Diluted by Ti, U does not possess magnetic moments and all alloys are weak paramagnets. However, specific heat and resistivity measurements in various magnetic fields indicate very high upper critical field  0 H c2 =16.4 ±0.2 T.

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“…The dependence of lattice constants and the cohesive energy of

-(U

) on the Zr concentrations are displayed in Figure 2 a. For comparison, we also plotted the lattice parameter of

-(U,Zr) in previous experimental studies [ 31 , 32 , 33 , 34 ]. The lattice constant almost linearly increased, while the cohesive energy linearly decreased, when the Zr mole fraction increased.…”

Section: Resultsmentioning

confidence: 99%

“… ( a ) The calculated lattice constant and cohesive energy versus Zr mole fraction for

-(U,Zr) alloys by MD, the experimental lattice parameters of

-(U,Zr) from previous studies [ 31 , 32 , 33 , 34 ] are also plotted, for comparison; the calculated radial distribution function for ( b )

-U, ( c )

-Zr, and ( d )

-(U,Zr) at a high temperature of 1200 K. …”

Section: Figurementioning

confidence: 99%

High-Temperature Mechanical and Dynamical Properties of γ-(U,Zr) Alloys

Han

Cai

et al. 2023

Materials

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High-temperature body-centered cubic (BCC) γ-U is effectively stablized by γ-(U,Zr) alloys that also make it feasible to use it as a nuclear fuel. However, relatively little research has focused on γ-(U,Zr) alloys due to their instability at room temperature. The effect of Zr composition on its mechanical properties is not clear yet. Herein, we perform molecular dynamics simulations to investigate the mechanical and dynamical stabilities of γ-(U,Zr) alloys under high temperatures, and we calculate the corresponding lattice constants, various elastic moduli, Vickers hardness, Debye temperature, and dynamical structure factor. The results showed that γ-U, β-Zr, and γ-(U,Zr) are all mechanically and dynamically stable at 1200 K, which is in good agreement with the previously reported high-temperature phase diagram of U-Zr alloys. We found that the alloying treatment on γ-U with Zr can effectively improve its mechanical strength and melting points, such as Vickers hardness and Debye temperature, making it more suitable for nuclear reactors. Furthermore, the Zr concentrations in γ-(U,Zr) alloys have an excellent effect on these properties. In addition, the dynamical structure factor reveals that γ-U shows different structural features after alloying with Zr. The present simulation data and insights could be significant for understanding the structures and properties of UZr alloy under high temperatures.

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Structure, Electrical Resistivity and Superconductivity of Low-alloyed γ-U Phase Retained to Low Temperatures by Means of Rapid Cooling

Cited by 19 publications

References 37 publications

γ-U phase in U-Pt system retained to low temperatures by means of rapid cooling

γ-U phase in U-Pt system retained to low temperatures by means of rapid cooling

Anomalous Superconductivity of the U-Ti Alloys

High-Temperature Mechanical and Dynamical Properties of γ-(U,Zr) Alloys

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