Sökning: "disordered alloys"

Visar resultat 1 - 5 av 35 avhandlingar innehållade orden disordered alloys.

  1. 1. Theory of Disordered Magnets

    Författare :Oleg E. Peil; Börje Johansson; Hubert Ebert; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; disordered alloys; magnetic alloys; spin glasses; ab initio calculations; Monte Carlo methods; Physics; Fysik;

    Sammanfattning : Studying magnetic properties of disordered alloys is important both for the understanding of phase transformations in alloys and from the point of view of fundamental issues of magnetism in solids. Disorder in a magnetic system can result in unconventional magnetic structures, such as spin glass, which have rather peculiar features. LÄS MER

  3. 2. Uncovering Magnetic Order in Nanostructured Disordered Materials : A Study of Amorphous Magnetic Layered Structures

    Författare :Panagiotis Korelis; Björgvin Hjörvarsson; Gabriella Andersson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Amorphous Materials; Magnetism; Amorphous Magnetism; Magnetic Measurements; Thin Films; Multilayers; Thin Film Deposition; Sputtering; FeZr Alloys; AlZr Alloys; X-ray Diffraction; Rutherford Backscattering Spectrometry; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : The scope of this thesis is the study of the interplay between structure and magnetism in amorphous materials. The investigations focus on the growth of amorphous layers and the study of the influence of structural disorder and reduced physical extension on the magnetic properties of thin films and multilayers. LÄS MER

  4. 3. First-principles investigations of ordering in binary alloys

    Författare :Moshiour Rahaman; Andrei Ruban; Staunton Julie; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ordering; random; alloys;

    Sammanfattning : The aim of the thesis is to study ordering in binary alloys on the basis of first-principles or {\it ab-initio} techniques employing density functional theory (DFT). The ordering phenomena of materials are of crucial importance for technological applications. LÄS MER

  5. 4. The Effect of Long Range Order on Elastic Properties of Alloys

    Författare :Guisheng Wang; Levente Vitos; Balázs Ujfalussy; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; long-range order; elastic constant; alloys; magnetic; Industriell ekonomi och organisation; Industrial Engineering and Management;

    Sammanfattning : Ab initio alloy theory, formulated within the exact muffin-tin orbitals method in combination with the coherent-potential approximation, is used to determine the effect of long range order on the elastic properties. The lattice parameters and single-crystal elastic constants of Cu3Au are calculated for different partially ordered structures ranging from the fully ordered L12 to the random face centered cubic lattice. LÄS MER

  7. 5. Thermodynamic and kinetic properties of Fe-Cr and TiC-ZrC alloys from Density Functional Theory

    Författare :Vsevolod Razumovskiy; Pavel Korzhavyi; Andrei Ruban; Malin Selleby; Sergei Dudarev; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ab initio; first principles; point defects; vacancy clusters; alloys; steels; iron; carbides; diffusion; phase diagram; density functional theory; elastic constants; elastic properties; thermodynamic modelling;

    Sammanfattning : The complete and accurate thermodynamic and kinetic description of any systemis crucialfor understanding and predicting its properties. A particular interest is in systemsthat are used for some practical applications and have to be constantly improved usingmodification of their composition and structure. LÄS MER