Materials Science Forum Vols. 480-481

Abstract: The magnetic, the magneto-optical and the optical properties of Ni2MnIn alloy films with significantly different atomic orders (from nearly single-crystalline to amorphous) were investigated. The crystalline Ni2MnIn alloy films are a ferromagnetic with a Curie temperature of 325 - 330 K, while the amorphous phase is not ferromagnetically-ordered (at least, above 293 K). The diagonal and the off-diagonal components of the dielectric function for the crystalline alloy were experimentally determined for the first time. The nature of interband excitations in the optical spectra of the ordered phase is discussed in terms of the band structures of Ni2MnSn. The analyses of changes in the electron energy structure of Ni2MnIn alloy, caused by the structural disordering, are performed using the results of optical study. An annealing at 750 K for 2 hrs of the amorphous film restores its crystallinity (B2 phase) and also the ferromagnetic order.

Abstract: The discreteness of vibration frequencies of diffusion coefficients of rare - earth elements ions in the forming gel of silicon acid is considered. The existence of at least three vibration frequencies being more probable for the gel system in question is established. The agreement of these results with the experiments studying the behaviour of pacemakers in zirconium oxyhydrate gels is shown. This agreement and the frequency discreteness mentioned prove the early assumption [1] that structuring of different gels proceeds through the process of formation and interaction of stable sites in a polymer structure of a discrete size (attractor). The system of attractors is of a fractal nature. The regularities established reflect the general nature of the gelation with any types of a gelforming polymer and ions diffusing in the micellar solution.

Abstract: We want to help to the technical preparation of the implantation of individual prosthesis by using the newest means of computer aided manufacturing. There are such cases when the factory-made implantations available are not suitable to replace the missing bone or joint. We have solved the replacement of an osteal skull defect with the Rapid Prototyping method in this paper. The advanced techniques has assured greater accuracy and simpler operative-technique in this case.