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- W2094921340 abstract "The sulphidation of copper by Sa dissolved in benzene has been studied in the concentration range 0.1-5.0 Sa g liter−1 and in the temperature range 283-313 °K. The continuous films observed have a composition varying with the progression of the reaction; the cristallographic study has shown that these films are constituted successively by the different phases: Cu1.97S (II) and (III), Cu2-xS (II) (x varying from 0.18 to 0.45) and CuS (I). The variation of the cristallographic parameter of the C. F. C. digenitoïde phase, Cu2-xS (II), has made it possible to follow the progression of the sulphidation by XR analysis. The kinetic study has been made by the radioactive tracer method. The sulphidation is a succession of different reaction mechanisms: initiation period (1), diffusion in the liquid phase (2), mixed diffusion (3), diffusion in the solid phase (4) (through the sulfides film itself). A systematic study of the main processus (2) and (4) has made it possible to define the fundamental parameters of the reaction (velocity constants: K (2) (298°K) = 73.3 γ cm−2 min−1. g−1 liter; K (4) (298 °K) = 4.7 10−7 cm Cu1.80S (II). 10−4 sec; activation energies: ΔK = −4.7 kcal. mole Cu1.80S (II)−1 for mechanism (2); ΔH= -11.2 keal. mole Cu1.80S (II)−1 for mechanism (4)). The diffusion in the solid phase follows an inverse logarithmic kinetic relationship and can be explained by the formation mechanism of thin corrosion films (Mott and Cabrera's theory)." @default.
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- W2094921340 date "2010-09-02" @default.
- W2094921340 modified "2023-09-26" @default.
- W2094921340 title "Sulfuration du Cuivre par le Soufre Dissous en Milieu Benzénique" @default.
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- W2094921340 doi "https://doi.org/10.1002/bscb.19720810156" @default.
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