Structural and Magnetic Properties of “Thick” Microwires Produced by the Ulitovsky-Taylor Method

The structural and magnetic physical properties of initial and annealed Co-rich microwires in a glass shell with the diameter D = 70-125 μm and the diameter of the amorphous metallic core d = 70-95 μm, produced by the Ulitovsky–Taylor method, have been studied. The magnetic characteristics, in particular, the saturation field HS and the coercive force HC of the samples were found to depend on annealing temperature. The obtained experimental data was explained by the structural peculiarities of the microwires. The near-surface values of HS and HC were found to be larger than the bulk values by a factor of 5–10. These experimental data have been explained by the existence of structural and chemical ingomogeneities in the near-surface layer, which are inherent in amorphous materials. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3531

Structure of the icosahedral Ti-Zr-Ni quasicrystal

The atomic structure of the icosahedral Ti-Zr-Ni quasicrystal is determined by invoking similarities to periodic crystalline phases, diffraction data and the results from ab initio calculations. The structure is modeled by decorations of the canonical cell tiling geometry. The initial decoration model is based on the structure of the Frank-Kasper phase W-TiZrNi, the 1/1 approximant structure of the quasicrystal. The decoration model is optimized using a new method of structural analysis combining a least-squares refinement of diffraction data with results from ab initio calculations. The resulting structural model of icosahedral Ti-Zr-Ni is interpreted as a simple decoration rule and structural details are discussed.Comment: 12 pages, 8 figure