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ArticleName Synthesis and properties of copper niobate (I) obtained by supercritical antisolvent technology
DOI 10.17580/tsm.2018.12.07
ArticleAuthor Smirnova K. A., Drobot D. V., Musatova V. Yu., Svetogorov R. D.

Moscow Technological University (Institute of Fine Chemical Technologies), Moscow, Russia:

K. A. Smirnova, Leading Engineer of the Department of Chemistry and Technology of Rare and Dispersed Elements, Nanoscale and Composite Materials named after K. A. Bolshakov, e-mail:

D. V. Drobot, professor of the Department of Chemistry and Technology of Rare and Dispersed Elements, Nanoscale and Composite Materials named after K. A. Bolshakov, e-mail:

V. Yu. Musatova, postgraduate student of the Department of Chemistry and Technology of Rare and Dispersed Elements, Nanoscale and Composite Materials named after K. A. Bolshakov


National Research Center “Kurchatov Institute”, Moscow, Russia:
R. D. Svetogorov, engineer of the Department of Synchrotron Experimental Stations of the Kurchatov Synchrotron-Neutron Research Complex


The authors of the article set forth scientific results of developing a new method of controlled (particle size and shape, specific surface) synthesis of copper niobate (I) — CuNb3O8, which has photocatalytic properties and is a p-type semiconductor. Information on the production of CuNb3O8 by Supercritical AntiSolvent technology using SCF-CO2 was not found in the literature. SСF are the substances which are in supercritical condition, at temperatures and pressure exceeding their critical values (respectively, Tcr, Rcr). SСF unite in a unique way property of liquid and gas. The speeds of the proceeding processes considerably increase in the conditions of SСF, the quality of the received products improves, energy consumption decreases, essentially (and sometimes completely act) problems with ecological safety of productions, in tens otherwise are solved, and at times and in hundreds of times the sizes of reactors and production constructions decrease. Copper (I) niobate was prepared by SAS technology using bimetallic methylate (Mx1M21 – x)2(OMe)10(M1 — Nb, M2 — Cu), as the precursor. It is shown that amorphous copper niobate (I) is a macro porous adsorbent with a specific surface area of 7.9 m2/g and contains macro pores with a volume of 0.018 cm3/g, the proportion of which is 49 % of their total number. Amorphous copper niobate (I) has 138 nm particles. Annealing of copper niobate (I) for 24 hours at T = 700 оC leads to crystallization of CuNb3O8 with monoclinic syngony and particle size 285 nm.
The work was carried out with the financial support of the Russian Foundation for Basic Research (project No. 18-03-00671) and in the framework of the state assignment No. 11.9872.2017/8.9.

keywords SCF technologies, SAS technology, the supercritical fluid, bimetallic methylate niobium, copper, copper niobate (I).

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