SVIBOR - Project code: 1-03-097

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Project code: 1-03-097


ELECTRONIC PROPERTIES OF METALLIC AND CERAMIC SYSTEMS


Main researcher: BABIĆ, EMIL (1146)


Assistants
Type of research: basic
Duration from: 01/01/91. to 01/01/94.
Papers on project (total): 95
Papers on project quoted in Current Contents: 50
Institution name: Prirodoslovno-matematički fakultet, Prirodoslovni odjeli, Zagreb (119)
Department/Institute: Department of Physics
Address: Bijenička c. 32
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)1 4555 730
Fax: 385 (0)1 432 525
E-mail: ebabic@phy.hr
Summary: Systematic investigation of the electronic transport and magnetic properties of selected metallic (mainly metallic glasses, MG) and oxide systems (high temperature superconductors, HTS) as well as nanostructures has been performed over broad temperature (1-1000K), magnetic field (1-8T), current (1-100A) and frequency (0-1 MHz) ranges. Electron- and light-microscopy, X-ray diffraction and electron spectroscopy methods have been used for sample characterisation and elucidation of the structure-processing-property relationship. The selection of particular system depended on its scientific and technological merits. Investigation of nonmagnetic MG contributed a better understanding of the electronic band structures and conductivity mechanism in strongly disordered materials. The study of magnetic MG yielded new knowledge about the nature of magnetism and phase transitions in structurally disordered materials with magnetic order. The analysis of M-H loops in soft ferromagnets enabled a more detailed understanding of the magnetisation processes and development of improved materials. A systematic study of basic and technologically important parameters of pure and composite HTS lead to a better understanding of the phenomenon and the development of technologically most usefull materials. The critical currents, their distributions and the mechanisms of dissipation (composition-structure-processing relationship) have been especially studied. Concurently novel experimental methods and physical models have been developed.

Keywords: metallic glass, high-Tc superconductor, electromagnetic properties, quantum coherence, spin-orbit scattering, phase transition, M-H loop, critical current, percolation, flux pinning, fluctuations

Research goals: The main purpose of this research is to improve the understanding of selected metallic and oxide systems. The selected systems (metallic glasses (MG) and high temperature superconductors (HTS)) are those of the highest scientific and technological relevance. The knowledge and understanding gained (cf. structure-property relationship) will promote their applicatios in high technology. For nonmagnetic MG's a more detailed understanding of the quantum coherence effects in both H-dopped and undopped transition metal alloys is expected. For the same systems the effects of the electronic band structure on the dynamical properties of electrons are studied by the Hall effect. High-precision research of the MG's close to the magnetic percolation treshold will lead to new knowledge on the phase transitions in the presence of strong disorder. Detailed understanding of magnetisation processes in currently employed MG's will lead to a great reduction in core losses of the present and future soft magnetic materials. An understanding of the percolation in disordered and anisotropic 3D granular systems (ceramic HTS) is of paramount scientific and applicative relevance. Simultaneously, an understanding of the flux pinning and losses in composite-textured HTS will broaden the knowledge and decide on their technological future. The detailed understanding of the electronic properties of the (own-made) HTS single crystal may lead to the microscopic theory of the high temperature superconductivity.

COOPERATION - PROJECTS


  1. Name of project: PN-982 Electronic properties of some metallic and ceramic systems
    Name of institution: NIST (National Institute for Standards and Technology)
    City: Boulder, SAD

  2. Name of project: CI1*0568-CCEDB Single crystals studies of high temperature superconductors
    Name of institution: EEC
    City: Brussels, Belgija

  3. Name of project: Project on Material Science and Physics of Materials
    Name of institution: Central European Initiative
    City: Genova, Italija

  4. Name of project: Strong and Weak Links in High Temperature Superconducting Tapes
    Name of institution: C.S.E.M., University of Wollongong
    City: Wollongong, Australija

COOPERATION - INSTITUTIONS


  1. Name of institution: Department of Physics, University of Leeds
    Type of institution: University/Faculty
    City: Leeds, UK

  2. Name of institution: National Institute for Standards and Technology
    Type of institution: State institute
    City: Boulder, SAD

  3. Name of institution: Department of Physics, Imperial college of Science, Medicine and technology
    Type of institution: University/Faculty
    City: london, UK

  4. Name of institution: Laboratoire de Physique des Solides, Universite Paris Sud
    Type of institution: University/Faculty
    City: Orsay, Francuska

  5. Name of institution: Dipartimento di Fisica, Universita di Genova
    Type of institution: University/Faculty
    City: Genova, Italija

  6. Name of institution: High Tc Laboratory, ICTP
    Type of institution: University/Faculty
    City: Trst, Italija

  7. Name of institution: Institut fur Experimental Physik, TU Graz
    Type of institution: University/Faculty
    City: Graz, Austrija

  8. Name of institution: Research Institute for Solid State Physics of the Hungarian Academy of Sciences
    Type of institution: University/Faculty
    City: Budapest, Mađarska

  9. Name of institution: School of Material Science and Technology, University of New South Wales
    Type of institution: University/Faculty
    City: Sydney, Australia

  10. Name of institution: Metglas Products, Allied Signal Inc
    Type of institution: Economical/Production
    City: Parsippany, SAD

  11. Name of institution: Institut za fiziku Sveučilišta
    Type of institution: University/Faculty
    City: 10000 - Zagreb, Croatia

  12. Name of institution: Institut Ruđer Bošković
    Type of institution: University/Faculty
    City: 10000 - Zagreb, Croatia

  13. Name of institution: CIRM - Energoinvest
    Type of institution: Economical/Production
    City: Sarajevo, Bosna i Hercegovina

  14. Name of institution: Pedagoški fakultet, Sveučilište J.J. Strossmayera
    Type of institution: University/Faculty
    City: 31000 - Osijek, Croatia

  15. Name of institution: E.P.F.L. - Physique
    Type of institution: University/Faculty
    City: Lausanne, Švicarska

  16. Name of institution: I.R.C.S. University of Cambridge
    Type of institution: University/Faculty
    City: Cambridge, Engleska

  17. Name of institution: Vacuumschmelze GmbH
    Type of institution: Economical/Production
    City: Hanau, Njemačka

  18. Name of institution: CRTBT - CNRS
    Type of institution: University/Faculty
    City: Grenoble, Francuska

OTHER ACHIEVEMENTS


  1. Name: a.c. susceptometar
    Type of achievement: Prototypes
    Authors: Đ.Drobac, M.Prester, E.Babić, Ž.Marohnić

  2. Name: kompjuterski programi za prikupljanje, obradu i prikaz podataka
    Type of achievement: Other
    Authors: Đ.Drobac, Ž.Marohnić, K.Zadro, M.Prester, J.Horvat, I.Kušević

  3. Name: znanstveno-istraživačka oprema (pulsni izvori struje,ac i dc pojačala, audio-pojačala, kontrolirani uređaji za točkasto varenje, uređaj za generiranje funkcija s pomakom u fazi, kalorimetri, klasični i supravodljivi magneti, itd)
    Type of achievement: Instrumentation
    Authors: M. Vukelić, E.Babić, Ž.Marohnić, M.Prester, Đ.Drobac,K.Zadro, I.Kušević, J.Horvat
Other information about the project.
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