Zinc doped with aluminium

Figure 11.7. A. NMR spectra of an Al-Mg alloy containing zinc, showing the signal from the matrix (upper) and from the precipitate, represented by stoichiometric MgnAli2 (lower). The 2 middle spectra show the effect of aging time at 200°C on the relative amounts of matrix and precipitate phases. B. Knight shift of the matrix of binary Mg-Al alloys as a function of aluminium content. C. Knight shift of the precipitate phase in Mg-Al alloys doped with zinc as a function of the Zn content. From Celotto and Bastow (2001) by permission of Elsevier Science.

Spectral dependence of the photoadsorption of oxygen on powdered samples of pure zinc oxide or sine oxide doped with lithium or aluminium has been studied by Zakharenko et al. [127] whose results provided... 

Another interesting application of perovskite-based hydrogen sensors, which has now been commercialized, is for monitoring hydrogen in molten metal such as aluminium, zinc and copper (Yajima and Iwahara 1992). As cerates were not entirely suitable, the investigators used CaZr03 doped with indium oxide as the solid electrolyte (Iwahara 1996). 

The key property required of the inorganic species is ability to build up (polymerize) around the template molecules into a stable framework. As is already evident in this article, the most commonly used inorganic species are silicate ions, which yield a silica framework. The silica can be doped with a wide variety of other elements (heteroatoms), which are able to occupy positions within the framework. For example, addition of an aluminium source to the synthesis gel provides aluminosilicate ions and ultimately an aluminosilicate mesoporous molecular sieve. Other nonsilica metal oxides can also be used to construct stable mesoporous materials. These include alumina, zirconia, and titania. Metal oxide mesophases, of varying stability, have also been obtained from metals such as antimony (Sb), iron (Fe), zinc (Zn), lead (Pb), tungsten (W), molybdenum (M), niobium (Nb), tantalum (Ta), and manganese (Mn). The thermal stability, after template removal, and structural ordering of these mesostructured metal oxides, is far lower, however, than that of mesoporous silica. Other compositions that are possible include mesostructured metal sulfides (though these are unstable to template removal) and mesoporous metals (e.g., platinum, Pt). 

Transparent conductive coatings combine high optical transmission with good electrical conductivity. The existence of both properties in the same material is, from the physics point of view, not trivial and is only possible with certain semi-conductors like indium oxide, tin oxide, cadmium oxide, and with thin gold and silver films, e.g. [157]. Particularly antimony or fluorine doped tin oxide (ATO, FTO), tin doped indium oxide (ITO), and aluminium, indium, or boron doped zinc oxide (AZO, IZO, BZO) are of technical importance [157a]. 

Conducting polymers exhibit unique characteristics that can be used in the context of corrosion protection. The reduction potential of conducting polymers like PPy, PTh and PANi is positive with respect to some of the most active metals like iron, zinc, aluminium and magnesium (Table 9.1). This fact can anticipate anodic protection as a relevant protection mechanism. Another point is that doping... 

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