Abstract
The hydrochemical precipitation method at 298 and 333 K with, respectively, thiocarbamide and sodium selenosulfate was used to obtain nanostructured powders of copper sulfide with formula composition Cu2S, which are composed of globules 200–500 nm in diameter, formed by 70–100-nm particles, and copper(I) selenide, composed of crystallites with polyhedral shape, sizes of 80 to 500 nm, and a formula composition Cu1.84Se. An X-ray diffraction analysis revealed the orthorhombic Cu2S structure (space group no. 39-Abm2) with unit cell parameters a = 1.182 nm, b = 2.705 nm, and c = 1.343 nm. Powders of Cu1.84Se copper selenide have a cubic structure (space group Fm3m) with lattice constant a = 0.5693 nm. A thermal analysis demonstrated that the chemically precipitated Cu2S and Cu1.84Se powders have a stable elemental composition up to 200–240°C. An intense oxidation of the samples begins at a temperature exceeding 250°C and is accompanied by a sharp decrease in their content of sulfur (selenium) and by an increase in the content of oxygen.
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Original Russian Text © L.N. Maskaeva, V.F. Markov, E.A. Fedorova, I.A. Berg, R.F. Samigullina, V.I. Voronin, 2017, published in Zhurnal Prikladnoi Khimii, 2017, Vol. 90, No. 10, pp. 1287−1294.
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Maskaeva, L.N., Markov, V.F., Fedorova, E.A. et al. Structure and Thermal Stability of Nanostructured Precursor Powders of Copper(I) Sulfide and Selenide. Russ J Appl Chem 90, 1572–1578 (2017). https://doi.org/10.1134/S1070427217100032
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DOI: https://doi.org/10.1134/S1070427217100032