Phase diagram mixed oxides

Figure 2.33. Ni-Co-O phase diagram (isothermal section at 1600 K). log p02 (oxygen partial pressure) is plotted against the molar fraction in the metallic alloy. The metallic alloy, (Ni, Co) solid solution is stable in (1) and the mixed oxide (Ni, Co)0 solid solution in (3). In the intermediate region (2) we have coexistence of alloy and oxide. For the value of the partial oxygen pressure corresponding to y, within the two-phase field, we will have the alloy of composition xt in equilibrium with an oxide containing the two metals in the ratio x2-...

Mixed micelles of an amine oxide and SDS exhibit extremely diverse rheological behavior as a function of composition within the water-rich region of the phase diagram of the system commonly referred to as the L. micellar phase. The spectra show a close correlation of increased tail (and headgroup) ordering and... 

More details of equilibrium models commonly used for gas phase equilibria, mixed phases, isotope effects, oxidation/reduction, electron activity, and pH stability diagrams can be found in Stumm and Morgan (1996) and Butcher and Anthony (2000). 

Only one mixed oxide is crystallized for the system where many oxide phases are present in the phase diagram, and the mixed oxide can be crystallized from a starting composition far from the stoichiometric one. 

The complex phase diagrams and rich crystal chemistry of the transition metal-containing oxide systems, and great diversity in the defect chemistry and transport properties of mixed-conducting materials known in these systems, make it impossible to systematize all promising compositions in a brief survey. The primary attention here is therefore centered on the comparison of major families of the oxide mixed conductors used for dense ceramic membranes and porous electrodes of SOFCs and other high-temperature electrochemical devices. 

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