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Phase transformations in Cd–Ni nanostructured system at elevated temperatures

Pugachev, V. M. ; Zakharov, Yu. A. ; Valnyukova, A. S. ; Popova, A. N. ; Khitsova, L. M. ; Yashnik, S. A. ; Ismagilov, Z. R.

Russian Chemical Bulletin, 1/2019, Vol.68(1), pp.17-23 [Periódico revisado por pares]

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  • Título:
    Phase transformations in Cd–Ni nanostructured system at elevated temperatures
  • Autor: Pugachev, V. M. ; Zakharov, Yu. A. ; Valnyukova, A. S. ; Popova, A. N. ; Khitsova, L. M. ; Yashnik, S. A. ; Ismagilov, Z. R.
  • Assuntos: Crystal Structure ; Metal Powders
  • É parte de: Russian Chemical Bulletin, 1/2019, Vol.68(1), pp.17-23
  • Descrição: Byline: V. M. Pugachev (1), Yu. A. Zakharov (1,2), A. S. Valnyukova (1,2), A. N. Popova (2), L. M. Khitsova (2), S. A. Yashnik (3), Z. R. Ismagilov (2,3) Keywords: nickel; cadmium; nanostructured powders; intermetallide; crystal structure; phase composition; solid solution 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 [degrees]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 CdNi.sub.3 and solid solution [Cd.sub.x]Ni.sub.1--x with face centered cubic structure) and among the known intermetallides ([Cd.sub.5]Ni and CdNi), only [Cd.sub.5]Ni 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 CdNi.sub.3 phase formation from [Cd.sub.5]Ni and [Cd.sub.x]Ni.sub.1--x phases, which are polar opposites in composition, is possible. The decomposition temperatures of [Cd.sub.5]Ni and melting point of Cd in the nanostructured state were lower than those specified by the phase diagram by 170 and 70 [degrees]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. Author Affiliation: (1) 0000 0001 2186 3188, grid.79013.3c, Kemerovo State University, 6 ul. Krasnaya., 650000, Kemerovo, Russian Federation (2) 0000 0001 2254 1834, grid.415877.8, The Federal Research Center of Coal and Coal Chemistry, Siberian Branch of the Russian Academy of Sciences, 18 prosp. Sovetskiy, 650000, Kemerovo, Russian Federation (3) 0000 0001 2254 1834, grid.415877.8, G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 5 prosp. Lavrentieva, 630090, Novosibirsk, Russian Federation Article History: Registration Date: 11/04/2019 Received Date: 12/10/2017 Accepted Date: 19/09/2018 Online Date: 13/04/2019 Article note: Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 0017--0023, January, 2019.
  • Idioma: Inglês

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