By Michael Binnewies
This accomplished guide covers the varied features of chemical delivery reactions from uncomplicated study to big useful purposes. The booklet starts with an summary of types for chemical delivery reactions after which proceeds to regard the categorical chemical delivery reactions for the weather, halides, oxides, sulfides, selenides, tellurides, pnictides, between others. features of shipping from intermetallic levels, the soundness of gasoline debris, thermodynamic facts, modeling software program and laboratory suggestions also are lined. chosen experiments utilizing chemical shipping reactions around out the paintings, making this booklet an invaluable reference for researchers and teachers in strong country and inorganic chemistry
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Extra info for Chemical vapor transport reactions
The gas species SiI4, SiI2, I2, and I might occur. This leads to ru = 4 – 2 + 1 = 3. By three unique equilibria the partial pressures of all gas species are determined. 4, others are possible. 4) In principle, both SiI2 and SiI4 can participate in the transport of silicon from the source to the sink. We do, however, not know the extent of their contribution. 32 2 Chemical Vapor Transport – Models We have already introduced in Chapter 1 the solubility λ of a solid in the gas phase. This expression summarizes the partial pressures p(SiI4) and p(SiI2), and allows in a simple way dissolution of a solid in a gas phase.
They are irrelevant for the transport, since their partial pressures are well below 10−5 bar. Calculation of the transport efficiencies yields for w(HCl) a negative value; its normalized partial pressure at the source is lower than at the sink. According to expectation HCl acts as transport agent. This means, it is consumed at the source region and released at the sink. 2). Calculation via the temperature dependent equilibrium constant Kp, T leads to the same results, since the transport is fully described by a single transport reaction.
It is always recommended prior to a CVT experiment to consider the aforementioned points. For the selection of T1 and T2 additional aspects, which are related to crystal growth (nucleation, growth rate), might gain importance. 9 Heterogenous equilibria including ZnO(s) as solid according to Schäfer (Sch 1972). 2 Condensed Phases in a Transport Experiment – the Most Simple Case The most simple case of a chemical transport experiment is given, if in the source region (region of dissolution) and in the sink region (region of deposition) over the whole period of the experiment single-phase solids with identical composition are present (source’s condensed phase(s): QBK, sink’s condensed phase(s): SBK).