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Nanosystems: Phys. Chem. Math., 2022, 13 (2), 212–219

Mechanism of formation of nanocrystalline particles with core-shell structure based on titanium oxynitrides with nickel in the process of plasma-chemical synthesis of TiNi in a low-temperature nitrogen plasma

Yu. A. Avdeevaa – Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Ekaterinburg, 620990, Russia; y-avdeeva@list.ru
I. V. Luzhkova – Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Ekaterinburg, 620990, Russia; key703@yandex.ru
A. N. Ermakov – Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Ekaterinburg, 620990, Russia; ermakovihim@yandex.ru

Corresponding author: Yu. A. Avdeeva, y-avdeeva@list.ru

PACS 61.46.+w, 61.46.-w, 61.66.Fn

DOI 10.17586/2220-8054-2022-13-2-212-219

ABSTRACT This paper presents the results of experiments, structural and morphological certification and modeling of ultrafine and nanocrystalline TiN-Ni “core-shell“ structures obtained during plasma-chemical synthesis of industrially manufactured microcrystalline TiNi. Experiments on plasma-chemical synthesis were carried out by recondensation of ultrafine and nanocrystalline powders in a rotating cylinder of gaseous nitrogen. X-ray phase analysis and high-resolution transmission electron microscopy (HR TEM) showed the presence of refractory titanium compounds with nitrogen and metallic nickel, which are part of the core-shell structures, including the metastable, highly deformed complex nitride Ti0.7Ni0.3N of hexagonal modification. HR TEM studies showed the localization of phases determined by X-ray diffraction and confirmed the “core-shell” structure on the example of nanocrystalline TiN-Ni fraction. Based on the experimental results, we have developed a model of crystallization of TiN-Ni “core-shell“ structures under the conditions of a rotating cylinder of gaseous nitrogen, where the crystallization rate is 105 °C/s.

KEYWORDS titanium nickelide, nickel, plasma-chemical synthesis, low-temperature plasma, X-ray phase analysis, high-resolution transmission electron microscopy.

ACKNOWLEDGEMENTS The work was carried out in accordance with the state assignment for the Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences (theme No 0397-2019-0003 “New functional materials for promising technologies: synthesis, properties, spectroscopy and computer simulation”).

FOR CITATION Avdeeva Yu.A., Luzhkova I.V., Ermakov A.N. Mechanism of formation of nanocrystalline particles with core-shell structure based on titanium oxynitrides with nickel in the process of plasma-chemical synthesis of TiNi in a low-temperature nitrogen plasma. Nanosystems: Phys. Chem. Math., 2022, 13 (2), 212–219.

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