By Allen Alper (Eds.)
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O P E N TUBES In the case of open-tube systems, the limitations on the choice of reactions are less stringent than for closed tubes for several reasons. Both nonreversible and easily reversible reactions may be used. The facts that the system is open and that reaction products are removed as they are formed changes the requirements on the values of log Κ The use of several different variants 24 A. REISMAN A N D Τ. Ο. SEDGWICK (Fig. 4 a - d ) of open-tube reactors provides the versatility needed to counteract thermodynamic or kinetic limitations, if they exist.
The following will attempt a quantitative estimation of the change in Ge vapor phase content as a function of temperature. If this is done over a useful temperature range, then one can choose source and deposition temperatures for a real transport experiment, if it is assumed equilibrium can be made to obtain over this temperature range. Further, the rate of transport to be expected can be calculated, based on assumed system flow rates. 2 I. 31 CHEMICAL DEPOSITION A N D S O L I D - V A P O R EQUILIBRIA The three-component-two-phase system, according to the phase rule, possesses three degrees of freedom.
REISMAN A N D Τ. Ο. SEDGWICK constants. Thus, the dissociation I (v) τ± 2I(v) (74) = pf/pt, (75) 2 is described by K PI The formation of the diiodide of Ge directly from the elements is given by Ge(s) + I (v) <=• G e l ( v ) 2 (76) 2 and is represented by K = PGd /Pi P2 2 (77) 2 Finally, the overall transport process described in Eq. (3) may be defined by The thought may occur that the direct formation of G e l via an analogous reaction to Eq. (76) should be included. However, given the set of Eqs.
Phase Diagrams. Materials Science and Technology by Allen Alper (Eds.)