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Russian Chemical Bulletin

, Volume 68, Issue 1, pp 17–23 | Cite as

Phase transformations in Cd–Ni nanostructured system at elevated temperatures

  • V. M. Pugachev
  • Yu. A. ZakharovEmail author
  • A. S. Valnyukova
  • A. N. Popova
  • L. M. Khitsova
  • S. A. YashnikEmail author
  • Z. R. Ismagilov
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Abstract

Using X-ray diffraction (both in vacuum and in air), derivatomass-spectrometry and thermo-programmed oxidation, phase transformations in nanostructured Cd–Ni system occurring while heating up 720 °C were described. These metal powders were obtained by joint reduction from aqueous solutions of salts with hydrazine. When study their composition, earlier unknown phases were detected (intermetallide CdNi3 and solid solution CdxNi1–x with face centered cubic structure) and among the known intermetallides (Cd5Ni and CdNi), only Cd5Ni was found. As a consequence, phase transformations in the obtained nanostructured powders were remarkably different from those present on the Cd–Ni phase diagram. The intermediates and FCC phase decompose independently with formation of individual initial components (Cd and Ni) without intermediate product. At relatively high Cd concentration in the system, intermediate CdNi3 phase formation from Cd5Ni and CdxNi1–x phases, which are polar opposites in composition, is possible. The decomposition temperatures of Cd5Ni and melting point of Cd in the nanostructured state were lower than those specified by the phase diagram by 170 and 70 °C, respectively, which well corresponded to the concept of effective (high) temperatures attributed to the nanostructured systems due to the energy saturation of the con stituent nanocrystallites.

Key words

nickel cadmium nanostructured powders intermetallide crystal structure phase composition solid solution 

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Copyright information

© Springer Science+Business Media, Inc. 2019

Authors and Affiliations

  • V. M. Pugachev
    • 1
  • Yu. A. Zakharov
    • 1
    • 2
    Email author
  • A. S. Valnyukova
    • 1
    • 2
  • A. N. Popova
    • 2
  • L. M. Khitsova
    • 2
  • S. A. Yashnik
    • 3
    Email author
  • Z. R. Ismagilov
    • 2
    • 3
  1. 1.Kemerovo State UniversityKemerovoRussian Federation
  2. 2.The Federal Research Center of Coal and Coal ChemistrySiberian Branch of the Russian Academy of SciencesKemerovoRussian Federation
  3. 3.G. K. Boreskov Institute of CatalysisSiberian Branch of the Russian Academy of SciencesNovosibirskRussian Federation

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