On the influence of irradiation type on the formation of radiation defects in Nb-based superconductors with A-15 structure

Chudinov, V. G.; Moseev, N. V.; Goshchitskii, B. N.; Protasov, V. I.

doi:10.1002/pssa.2210550111

Cited by 8 publications

References 9 publications

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Simulation of collision cascades in intermetallic Nb3Sn compounds

Chudinov

Gocoein

Goshchitskii

et al. 1981

Phys. Stat. Sol. (a)

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The collision cascade in Nb3Sn compounds is simulated by means of molecular dynamics technique. It is estimated, that focusing collisions propagate along the 〈120〉, 〈100〉, 〈111〉 directions and along the atomic chains of Nb. Formation of “antistructural” defects directly in the collision cascade seems to be hardly probable. The crystal structure of the cascade region is strongly disturbed after relaxation, which is likely to lead to distortion of the translational symmetry under irradiation by sufficiently large fluences. The comparison with the experimental data shows, that the calculated structures are observed at irradiation of Nb3Sn by light charged particles, during which cascade regions of small dimensions (≈ 15 Å) are formed. The results for Nb3Sn, irradiated by fast neutrons can be understood only in terms of evolution of a cascade region (≈ 70 Å) at the following stage of thermal spike. In this case, as distinct from the above mentioned, there may be local melting with subsequent superfast crystallization. Since the surrounding matrix keeps an ideal structure, in the cascade region the same structure should be observed; but atoms of Nb and Sn will not have enough time to occupy their right positions.

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Simulation of collision cascades in intermetallic Nb3Sn compounds

Chudinov

Gocoein

Goshchitskii

et al. 1981

Phys. Stat. Sol. (a)

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Atomic Configurations of Point Defects in Intermetallic Nb3Sn Compound

Chudinov¹,

Moseev²,

Goshchitskii³

et al. 1982

phys. stat. sol. (a)

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Configurations of antisite defects and vacancies in Nb,Sn are calculated by molecular dynamics technique with the help of Buckingham empiric potentials and the ones calculated by the pseudopotential scheme using the Heine-Abarenkov-Animalu pseudopotential. I n the case of Buckingham potentials the displacements do not exceed 1% of the value of the constant lattice; and in the latter case they reach z 10%. This discrepancy accounts for the structural differences observed a t irradiation of Nb,Sn by fast neutrons and a-particles. Es werden die Konfigurationen vonAntiplatzdefekten und Leerstellen in Nb,Sn mittels dynamischer Molekulartechnik unter Benutzung des empirischen Buckingham-Potentials und den Potentialen, die mit der Pseudopotentialmethode nach dem Heine-Abarenkov-Animalu-Pseudopotential berechnet werden, ermittelt. Fur den Fall des Buckingham-Potentials ubersteigen die Verlagerungen nicht 1% des Wertes des konstanten Gitters; und im letzteren Fall erreichen sie = 10%. Diese Diskrepanz erklart die strukturellen Differenzen, die bei der Bestrahlung von Nb,Sn durch schnelle Neutronen und a-Teilchen beobachtet werden.

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Evolution of the cascade region in Nb3Sn during the thermal spike under fast-neutron irradiation

Chudinov

Gogolin

Goshchitskii

et al. 1983

Phys. Stat. Sol. (a)

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Evolution of a cascade region during the thermal spike in the intermetallic Nb3Sn compound with A‐15 structure is simulated by the molecular dynamics technique (MDT). It is shown that in the case of “slow” cooling (⪅ 1.5 × 1014 K/s) there exists a possibility of local melting into a cascade region (CR) with subsequent crystallisation into the same structure, atoms of Nb and Sn being randomly distributed over the sites of the A‐15 lattice, while in the case of more rapid cooling it goes into the fully or partially amorphous state. According to the calculated and experimental data the former mechanism is preferable in Nb3Sn irradiated with fast neutrons and heavycharged particles of low energies.

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On the influence of irradiation type on the formation of radiation defects in Nb-based superconductors with A-15 structure

Cited by 8 publications

References 9 publications

Simulation of collision cascades in intermetallic Nb3Sn compounds

Simulation of collision cascades in intermetallic Nb3Sn compounds

Atomic Configurations of Point Defects in Intermetallic Nb3Sn Compound

Evolution of the cascade region in Nb3Sn during the thermal spike under fast-neutron irradiation

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