Publication:
Synthesis of Nanosized Zirconium Dioxide, Cobalt Oxide and Related Phases in Supercritical CO2Fluid

Дата
2021
Авторы
Sokolov, I. E.
Zakalyukin, R. M.
Kopylova, E. V.
Kumskov, A. S.
Mozhchil, R. N.
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Научные группы
Организационные подразделения
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Аннотация
© 2021. All Rights Reserved.This study is devoted to obtaining nanoscale zirconium dioxide, cobalt oxide and related phases by SAS method in supercritical carbon dioxide. The synthesized compounds were charac-terized by a complex of physico-chemical analytical methods: infrared spectroscopy, differential scanning calorimetry, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy. The experimental parameters for obtaining the nanoparticles were: pressure 10 MPa, temperature 40 °C, carbon dioxide supply rate 35 g/min, the initial solution supply rate 0.5 ml/min. Individual phases containing zirconium and cobalt, and also samples with zirconium to cobalt mo-lar ratios 3:1, 2:1, 1:1, 2:1 and 1:3 were obtained. The use of zirconium and cobalt acetylacetonates as initial components leads to formation of stable products – nanoparticles of acetates of the cor-responding metals in the X-ray amorphous state. When heated to 340-350 °C, the destruction of organometallic complexes to oxides occurs with formation of a continuous series of X-ray amor-phous solid solutions in the ZrO2-CoO system. At temperatures above 600 °C, the phases crystallize with the decomposition of solid solutions into ZrO2and Co3O4. When temperature is above 900 °C, further oxidation of cobalt occurs. Thus, cobalt oxide oxidation into Co3O4proceeds in two steps, at 600 and 900 °C. For samples of zirconium dioxide with cobalt oxide admixture at a temperature of 700 °C stabilization of the cubic modification is observed which is probably due to the entry of cobalt into the cubic structure of zirconium oxide, which prevents transition to tetragonal and mon-oclinic modifications.
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Synthesis of Nanosized Zirconium Dioxide, Cobalt Oxide and Related Phases in Supercritical CO2Fluid / Sokolov, I.E. [et al.] // ChemChemTech. - 2021. - 64. - № 5. - P. 35-43. - 10.6060/IVKKT.20216405.6060
URI
https://www.doi.org/10.6060/IVKKT.20216405.6060
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85107488510&origin=resultslist
 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000652507200006
 https://openrepository.mephi.ru/handle/123456789/24232
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