Кафедри

Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/35393

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2017 - 20202

Налаштування

ORCID: search.filters.orcid.https://orcid.org/0000-0002-9638-7080Ключові слова: search.filters.subject.critical phenomena

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Зараз показуємо 1 - 2 з 2
  • Ескіз
    Публікація
    Percolation transition and physical properties of Bi1-xSbx solid solutions at low Bi concentration
    (Elsevier Ltd, 2020) Rogacheva, E. I.; Doroshenko, A. N.; Khramova, T. I.; Nashchekina, O. N.; Fedorov, A. G.; Mateychenko, P. V.
    The dependences of microhardness H, electrical conductivity σ, charge carrier mobility μH, the Seebeck coefficient S, and thermoelectric power factor P = S2σ on the composition of Bi1-xSbx solid solutions in the vicinity of pure Sb (x = 1.0–0.975) were obtained. In the range of x = 0.9925–0.9875, an anomalous decrease in H and S and increase in σ and μH with increasing Bi concentration were observed. For all the alloys, the dependences of H on the load on an indenter G were plotted. It was found that the H(G) dependences for samples with x smaller than ~ 0.99 and for samples with x exceeding 0.99, exhibit different behavior. The results obtained are interpreted on the basis of our assumption about the existence of a percolation-type phase transition from impurity discontinuum to impurity continuum that occurs in any solid solution.
  • Ескіз
    Документ
    Magnetoresistance of Polycrystalline Bi₁₋ₓSbₓ Alloys (x = 0 – 0.07)
    (IEEE, 2017) Doroshenko, A. N.; Martynova, K. V.; Rogacheva, E. I.
    A detailed investigation of the composition dependences of magnetoresistance for polycrystalline Bi₁₋ₓSbₓ solid solutions in a concentration range x = 0 – 0.07 was performed at 300 K in weak and strong magnetic field. It was shown that the composition dependences of magnetoresistance are clearly expressed nonmonotonic type. The presence of concentration anomalies of magnetoresistance was confirmed that had been earlier observed in the range x = 0 – 0.1 on cast samples after different kinds of thermal treatment and interpreted as a manifestation of electron phase transitions. It is shown that the position of the extrema does not depend on the magnitude of the magnetic field in the interval 0.01 - 1.0 T.