Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 3

Characterization of Al-Mg thin film deposited using pulsed laser deposition technique

nr katalogowy: 78033

One of the most important changes in the domain of current surface engineering consists in the discovery and application of modern materials and techniques of the production, as well as their application in nanotechnology, biophysics, optoelectronics and other, dynamically developing field of science and common applications of the technology. Therefore, to produce thin films, which are widely used in the above-mentioned industries the new technology namely pulsed laser deposition (PLD) was applied. Complex Metallic Alloys (CMA) are characterized by the presence of a hundred up to over a thousand atoms in one unit cell. They are exceptional intermetallic phases. The first pioneering work concerning the structure of intermetallic compounds was published by Pauling in 1923 [1]. It was focused on the NaCd2 compound (1152 atoms in a unit cell). There are some other examples of such materials: the Bergman phase: Mg32(Al, Zn)49 (162 atoms in a unit cell) [2], or the Samson phase: ?Ŕ-Al3Mg2 (1168 atoms in a unit cell) [3, 4]. According to Samson, the ?Ŕ-Al3Mg2 phase is a light material (density: 2.2 g/cm3) with exceptionally large unit cells that crystallize in a face centered cubic (FCC) lattice with the crystal lattice parameter a = 2.82 nm. The basic elements and simple intermetallic compounds, compared to CMA materials [5, 6] with giant unit cells, are generally characterized by unit cells consisting of only a single atom or several tens of other atoms. On the other hand, in the giant unit cells that are found in ?Ŕ-Al3Mg2 and that are characterized by lattice parameter values in the order of several nanometers, there is a shift of the crystal lattice at the scale of interatomic distances. In such case, atoms are arranged into polytetrahedral clusters and the structure of CMA materials is characterized by a certain duality, namely: at the nanometric scale, the structure of CMA materials is similar to that of crystals, while at ato[...]

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