Last modified: 23.05.2008
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Department of Electrochemically Obtained Materials and Corrosion Processes

Magnetic Films Group

Head: Professor Stephan Armyanov , Ph.D., D.Sc., phone (+3592) 979 3585, e-mail: armyanov@ipchp.ipc.bas.bg 
Staff: Research Associates Eng. Jenya Georgieva, Eugenia Valova, Eng. Phys. Dragomir Tatchev, Boriana Rashkova

Research Topics

  • Electroless deposition of ternary alloys Ni-Me-P & Co-Me-P (Me = Cu, Zn, Fe, W, Re) mechanism, distribution of Me, thermal stability, other properties.
  • Magnetic & SAXS granulometry of Ni and Ni-Me precipitates in Ni-P & Ni-Me-P amorphous alloys.
  • Electrosynthesis of photocatalytically active WO3 and TiO2 coatings.
  • Relationship between plating parameters, structure and magnetic properties of electro- & electroless deposited films (cobalt based alloys).
  • R & D in high-tech magnetic materials .
  • Internal stress measurement during electrodeposition -- three types of stress: instantaneous, residual and average. Plotting of the residual stress diagram through the coating thickness.
  • Role of hydrogen desorption for the internal stress origination in electro- and electroless deposited materials.
  • Internal stress measurement and investigation of the stress relaxation in electroless plated amorphous alloys.

Photocurrent vs. potential in 0.1 M K2SO4 + 10-3 M oxalate under UV and VIS illumination of electrosynthe-sized WO3 and bi-layer TiO2/WO3 coatings.

DSC and Magnetic Properties of Co-W-P alloy.

Academic Collaboration:

International

  • Université Libre de Bruxelles, Science des Matériaux et Electrochimie, Bruxelles, Belgium ;
  • Vrije Universiteit Brussel, Dienst Metallurgie, Elektrochemie en Materialenkennis, Brussel, Belgium;
  • University of Rostok, Germany,
  • Hahn-Meitner-Institute, Berlin, Germany;
  • Physical Chemistry Lab, Chemistry Department, Aristotle University of Thessaloniki, Greece;
  • School of Chemical, Environmental and Mining Engineering, University of Nottingham, UK;

Bulgarian

  • Institute of Catalysis, Bulgarian Academy of Sciences, Sofia;
  • Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia;
  • Department of General & Inorganic Chemistry University of Sofia;
  • Department of Technical Mechanics, University of Russe, Russe;

Primary crystallisation of amorphous Ni83P17 alloy studied by ASAXS.

Particle size distribution (top) and particle composition (bottom) for Ni83P17 alloy annealed at 242oC. Matrix composition (top) and particle volume fraction (bottom) for annealed Ni83P17 alloy.