Chemical potential diagrams

Figure 1.1 (a) Chemical potential diagrams for systems forming a complete... 

Figure 3.2 Chemical potential diagrams for the transport of silicon carbide by chlorine, showing that the much greater stability of SiCU than CCI4 makes this process very inefficient, while the use of HCl as the transporting gas can be operated under optimum conditions...

The chemical potential diagram for this ternaty system (Figure 3.3) shows that the reaction with the elements would reduce the iodine pressure to a very low value, which is not suitable for CVD, whereas tire compound Ta5Si3, in which the chemical potentials of the two elements are about 40kJgram-atom would be suitable for CVD at about 1300 K. 

Figure 3.3 Chemical potential diagram for the transport of titanium silicides by chlorine, showing that only TaSi2 can provide the proper ratio of Ta and Si for stoichiometric transport...

Figure 1.1 (a) Chemical potential diagrams for systems forming a complete range of solid solutions. The tangent shows at its terminal points, X, Y the chemical potentials of the elements x and y which are in equilibrium with the solid solution of composition M (b) Potentials for the system A-B, which forms the two stable compounds the stoichiometric A2B and the non-stoichiometric AB2. The graph shows that there are many pairs of potentials A, B in equilibrium with A2B and only one pair for a particular composition of AB2 AB is metastable with respect to decomposition to A2B and AB2... 

Figure 4.28 (a) Three-dimensional chemical potential diagram for the system Co-Ti-O at 1000 K. (b) Two-dimensional chemical potential diagram at the same conditions [24]. Reprinted with permission of The American Ceramic Society, www.ceramics.org. Copyright [1989]. All rights reserved. 

Thermodynamic data for a system (such as AS, AH, and AG) are obtained by preparing a chemical potential diagram as mentioned in Section A, and these data are useful as information contributing to better understanding of the defect structures of nonstoichiometric compounds. Several methods are available for preparing the chemical potential diagram (40), as described below, taking the U-O system as an example. 

Solid Oxide Fuel Cells, Thermodynamics, Fig. 4 Chemical potential diagrams for the La-Mn-Zr-O and the La-Co-Zr-0 system and analyses in terms of the stabilization energy and the valence stability of transition metal oxides... 

Yokokawa H (1999) Generalized chemical potential diagram and its applications to chemical reactions at interfaces between dissimilar materials. J Phase Equilib 20(3) 258-287... 

Using these equations, the stability fields of the minerals in this system can be shown on activity diagram and chemical potential diagram (Figs. 1.3,1.4, and 1.5). Thermochemical data that can be used for constructing stabihty diagrams are presented in Table 1.1. 

Chemical potential diagram of the fi-AI-O system at 1273 K (from Inaba and Murata, 1997, reproduced with permission). 

Inaba H and Murata Y (1997), Analysis of interface reactions of TiAl/Al203 and TiAl/ Ti02 by the use of chemical potential diagram , J Ceramic Soc Japan, 105 (9), 740-745. 

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