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Structure and Thermal Stability of Nanostructured Precursor Powders of Copper(I) Sulfide and Selenide
Authors:L.?N.?Maskaeva  author-information"  >  author-information__contact u-icon-before"  >  mailto:mln@ural.ru"   title="  mln@ural.ru"   itemprop="  email"   data-track="  click"   data-track-action="  Email author"   data-track-label="  "  >Email author,V.?F.?Markov,E.?A.?Fedorova,I.?A.?Berg,R.?F.?Samigullina,V.?I.?Voronin
Affiliation:1.Ural Federal University Named after the First President of Russia B.N.Yeltsin,Yekaterinburg,Russia;2.Ural Institute of State Fire Service of EMERCOM of Russia,Yekaterinburg,Russia;3.The Institute of Solid State Chemistry, Ural Branch,Russian Academy of Sciences,Yekaterinburg,Russia;4.Mikheev Institute of Metal Physics, Ural Branch,Russian Academy of Sciences,Yekaterinburg,Russia
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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