Experimental EPR results obtained on Cu2+ in copper (I) sulphide are discussed. It is shown that one can easily detect the existence of Cu2+ ions in the Cu1.96S phase with the concentration decreasing as the temperature is increased. This suggests that with temperature increase from room temperature up to about 395 K Cu1.96S tends to almost stoichiometric Cu2S. The detected changes in the EPR lineshapes and g‐factor values are interpreted in terms of phase transitions taking place in the substance.

The reaction of CuSO, with CuzSO2 to give Cu~SO, was studied. The influence of the degree of reaction, the initial raJxture composition and the temperature upon the reaction rate and the product composition was discussed. It was found that the reaction starts above 710 K and pure Cu2SO4 can be obtained under strictly defined conditions.

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