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The Cu2SO2 phase

Its preparation and some properties

Journal of Thermal Analysis and Calorimetry
Authors: H. Dębinski and J. Walczak
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The reaction process between CuSO4 and excess Cu2S in the temperature range 650–750 K was investigated by methods of thermal analysis and by studying the phase contentss of the products as a function of the fractional conversion. The reaction proceeds in three steps, with Cu2S and a new phase described by the formula Cu2SO2 as intermediates. This new phase is liquid under the conditions of the reaction. The final product of the reaction is a defective crystalline Cu2O.

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The reaction between copper(I) sulphide and excess copper(II) sulphate in the temperature range 600–750 K was investigated by methods of thermal analysis as well as by measuring the phase composition as a function of the fractional conversions. The reaction proceeds in four stages. The transient products are Cu2S, a Cu2SO2 phase and CU2SO4, and the final product is CU2O with the non-defect structure. The initial composition of the substrate mixture strongly influence the reaction kinetics.

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The course of the reaction between copper(I) sulphide and copper(II) sulphate in SO2 at 710–785 K was studied by the TG method under isothermal and non-isothermal conditions, as well as by the DTA method, X-ray analysis and scanning electron microscopy. It was established that the reaction is essentially dependent upon the initial composition of the substrate mixture, Cu2SO2 and Cu2SO2 being the chief intermediates in the reaction. Copper(I) oxide appears as the permanent final product of the reaction of interest. The reaction network, with the intermediate stages depending on the initial compositions in the temperature range studied, has been demonstrated.

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