By Michael Binnewies
This entire guide covers the various facets of chemical delivery reactions from simple study to big sensible purposes. The booklet starts off with an summary of types for chemical shipping reactions after which proceeds to regard the categorical chemical delivery reactions for the weather, halides, oxides, sulfides, selenides, tellurides, pnictides, between others. points of delivery from intermetallic levels, the steadiness of fuel debris, thermodynamic info, modeling software program and laboratory innovations also are coated. chosen experiments utilizing chemical delivery reactions around out the paintings, making this e-book an invaluable reference for researchers and teachers in reliable kingdom and inorganic chemistry
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Additional info for Chemical vapor transport reactions
23) The solubility λ(ReO2) thus defined, consists of an amount of rhenium irreversibly dissolved in the gas phase. This amount of ReO2 can not be precipitated and remains in the gas phase as Re2O7. 6. 24. 27 have to be used. 27) The same expression for λ(Fe2O3) describes the deposition of Fe2O3 from a gas flow consisting of FeCl3, H2O, and O2 (chemical vapor deposition, CVD). For this case a surplus of H2O and O2 might be used to accomplish quantitative deposition of iron 36 2 Chemical Vapor Transport – Models from the gas phase.
7) sink Transport effecting gas species are formed at the source (dissolution region) and consumed at the sink. p*(X )] > 0 indicates a net flux from source to sink (p(i)source > p(i)sink). Therefore they facilitate in the temperature gradient the transfer of the individual components of the condensed phase(s). p*(X )] < 0 are consumed by heterogeneous equilibrium reactions at the source and released at the sink (p(i)source < p(i)sink), these species have to be regarded as transport agents. The absolute transport efficiency refers to the fraction of the transport efficiency of a gas species, that really contributes to the transport of a solid.
H. Schäfer, Z. Anorg. Allg. Chem. 1973, 400, 242. -Th. Wilke, J. Bohm, Kristallzüchtung, Harri Deutsch, Frankfurt, 1988. 2 Chemical Vapor Transport – Models Transport based on congruent evaporation Transport via a single equilibrium reaction 1 ZnS(s) + I2(g) # ZnI2(g) + S2(g) 2 Complex transport behavior based on several equilibrium reactions Si(s) + SiI4(g) # 2 SiI2(g) Si(s) + 2 I2(g) # SiI4(g) Transport based on incongruent evaporation Transport experiments in a quasi steady-state Deposition of phases with homogeneity range (FeSx) Deposition of a single phase in the sink starting from a two-phase equilibrium mixture in the source (VnO2n−1) Time-dependent (non steady-state, non-stationary) transport experiments Sequential migration of a polyphasic solid (CuO/Cu2O) In Chapter 2 the theoretical foundations of chemical transport reactions will be laid.