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By Harald Schafer

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On this basis in particular, those reactions must be discussed where the intermediate gaseous chloride is not monomolecular, so t h a t the process proceeds with a decrease in the number of moles. These con­ ditions are fulfilled by the equilibrium reaction (22), for example, at temperatures from about 300 to 400°C. This reaction, however, has not been fully investigated as t o its transport properties. A characteristic and thoroughly examined case is the copper(I) oxide transport* 13 ) according to Eq.

These relations will be examined more closely. If a reaction tube is filled with the solid substance, A, and a known quantity of B, then the equilibrium pressures for the reaction between A and B can be calculated for the separate chambers at T\ (or T^) such that the total pressure is equal in both chambers. If the hypo­ thetical wall that separates the two chambers is removed, then the transport starts. In this calculation with the hypothetical wall, one has tacitly introduced the condition that there be not only equili­ brium between the gaseous and the solid phase, but at the same time also stoichiometry between the gaseous reaction products : P c : PO = j : I This stoichiometric relationship can be disturbed by the diffusion, without, however, destroying the basic stipulation that the gas phase and the solid phase be in equilibrium with each other.

137) Details of the process, however, have not been examined. The application of iodine as a transporting agent deserves special consideration. 3 The Transport 56 of Solid Substances The transport of iron sulfide according to the heterogeneous Eq. (42) was expected on the basis of thermodynamic considerations. 5 S2 700°C; Rd") (42) Experiments in a quartz tube using about 2 mg of I2 per centimeter 3 in which not FeS but Fe and S in stoichiometric quantities were introduced produced FeS crystals, as shown in Fig.

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