Changes of microstructure and electrical resistivity of ordered Cu-40Pd (at.%) alloy under severe plastic deformation

Antonova, O. V.; Volkov, A. Yu.

doi:10.1016/j.intermet.2011.09.004

Cited by 28 publications

(5 citation statements)

References 16 publications

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“…𝑅(𝑇 𝑐 𝑜𝑛𝑠𝑒𝑡 ) ratio were discussed elsewhere [36]. Here we only point out that the use of 𝑇 𝑐 𝑜𝑛𝑠𝑒𝑡 criterion, which utilizes in some, but not in all, reports on highly-compressed superconductors, can be objected by experimental fact that the change in R(T) slope, or even sharp drop in R(T), is observable at many phase transitions in condensed matter when structural phase transitions occur [37][38][39].…”

Section: R(tb) Analysismentioning

confidence: 92%

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors

Talantsev

2021

J. Phys.: Condens. Matter

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Satterthwaite and Toepke (1970 Phys. Rev. Lett. 25 741) predicted high-temperature superconductivity in hydrogen-rich metallic alloys, based on an idea that these compounds should exhibit high Debye frequency of the proton lattice, which boosts the superconducting transition temperature, T c. The idea has got full confirmation more than four decades later when Drozdov et al (2015 Nature 525 73) experimentally discovered near-room-temperature superconductivity in highly-compressed sulphur superhydride, H3S. To date, more than a dozen of high-temperature hydrogen-rich superconducting phases in Ba–H, Pr–H, P–H, Pt–H, Ce–H, Th–H, S–H, Y–H, La–H, and (La, Y)–H systems have been synthesized and, recently, Hong et al (2021 arXiv:2101.02846) reported on the discovery of C2/m-SnH12 phase with superconducting transition temperature of T c ∼ 70 K. Here we analyse the magnetoresistance data, R(T, B), of C2/m-SnH12 phase and report that this superhydride exhibits the ground state superconducting gap of Δ(0) = 9.2 ± 0.5 meV, the ratio of 2Δ(0)/k B T c = 3.3 ± 0.2, and 0.010 < T c/T F < 0.014 (where T F is the Fermi temperature) and, thus, C2/m-SnH12 falls into unconventional superconductors band in the Uemura plot.

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Section: R(tb) Analysismentioning

confidence: 92%

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors

Talantsev

2021

J. Phys.: Condens. Matter

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“…10,11 cannot be used to distinguish the difference between the change in the resistance originated from any phase transition in the sample (for instance, the atomic ordering, the ferromagnetic ordering, structural phase transition, etc., see, for instance, Refs. [55][56][57][58][59] and the superconducting transition. The latter has one essential property which distinguishes the superconducting transition from all other phase transition, and this is zero resistance.…”

Section: Utilized Modelmentioning

confidence: 99%

The electron–phonon coupling constant and the Debye temperature in polyhydrides of thorium, hexadeuteride of yttrium, and metallic hydrogen phase III

Talantsev

2021

Journal of Applied Physics

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Milestone experimental discovery of superconductivity above 200 K in highly-compressed sulphur hydride by Drozdov et al (Nature 525, 73 (2015)) sparked experimental and theoretical investigations of metallic hydrides. Since then, a dozen of superconducting binary and ternary polyhydrides have been discovered. For instance, there are three superconducting polyhydrides of thorium: Th4H15, ThH9, and ThH10 and four polyhydrides of yttrium: YH4, YH6, YH7, YH9. In addition to binary and ternary hydrogen-based metallic compounds, recently Eremets et al (arXiv:2109.11104) reported on the metallization of hydrogen, which is in remarkable agreement with first-principles calculated e-ph(174 GPa) = 1.75 (Semenok et al, Materials Today 33, 36 (2020)). Deduced e-ph(172 GPa) = 1.90 ± 0.02 for Im-3m-YD6 is also in excellent agreement with first-principles calculated e-ph(165 GPa) = 1.80 (Troyan et al, Advanced Materials 33, 2006832 (2021)). And finally, we deduced T(402 GPa) = 727 ± 6 K for hydrogen phase III which implies that e-ph(402 GPa) ≤ 1.7 in this metal.The electron-phonon coupling constant and the Debye temperature in polyhydrides of thorium, hexadeuteride of yttrium, and metallic hydrogen phase III

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“…6e, 6f). These experiments allowed us to reveal the traces of the lamellar structure, which is usually observed at a stage of the developed plastic deformation [6,22].…”

Section: Resultsmentioning

confidence: 99%

“…However, we previously established that copper-palladium alloys can be torsionally deformed under a high pressure to very large degrees (to ε ≈ 7.5) with no fracture signs [6]. A disadvantage of the method of such intense effect is that the prepared sam ples have small sizes.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the microstructure and mechanical properties of the Cu-47Pd (at %) alloy during atomic ordering after severe plastic deformation

Antonova

Новикова

Антонов

et al. 2015

Phys. Metals Metallogr.

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The possibility of severe plastic deformation of the Cu-47Pd (at %) alloy by room temperature rolling to high degrees without intermediate anneals has been shown. The microstructure and physicome chanical properties of ribbons 100 and 4.5 μm thick in the initial strongly deformed state (the true degree of deformation ε ≈ 4.4 and ε ≈ 7.5, respectively), as well as after thermal treatments of various durations have been studied. High alloy plasticity during rolling is explained by recovery processes, which occur in the mate rial during SPD. The formation of single phase B2 type ordered state, which diverges with the phase dia gram, is found. , wt % Temperature, °С Temperature, К В2(bcc) High hydrogen permeability А1(fcc) Low hydrogen permeability А1 + В2 Cu-47 at % Pd (60 wt %) Fig. 1. Portion of the phase diagram of Cu-Pd alloys with B2 type ordering [1].

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Changes of microstructure and electrical resistivity of ordered Cu-40Pd (at.%) alloy under severe plastic deformation

Cited by 28 publications

References 16 publications

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors

The electron–phonon coupling constant and the Debye temperature in polyhydrides of thorium, hexadeuteride of yttrium, and metallic hydrogen phase III

Evolution of the microstructure and mechanical properties of the Cu-47Pd (at %) alloy during atomic ordering after severe plastic deformation

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Changes of microstructure and electrical resistivity of ordered Cu-40Pd (at.%) alloy under severe plastic deformation

Cited by 28 publications

References 16 publications

Comparison of highly-compressed C2/m-SnH12 superhydride with conventional superconductors

Comparison of highly-compressed C2/m-SnH12 superhydride with conventional superconductors

The electron–phonon coupling constant and the Debye temperature in polyhydrides of thorium, hexadeuteride of yttrium, and metallic hydrogen phase III

Evolution of the microstructure and mechanical properties of the Cu-47Pd (at %) alloy during atomic ordering after severe plastic deformation

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Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors