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Featured researches published by K. Racka.


Journal of Applied Physics | 2005

Aerosol nanoparticles in the Fe1−xCrx system: Room-temperature stabilization of the σ phase and σ→α-phase transformation

Martí Gich; E. A. Shafranovsky; Anna Roig; A. Ślawska-Waniewska; K. Racka; Ll. Casas; Yu. I. Petrov; Elies Molins; M. F. Thomas

The production and structural characterization of gas-evaporated nanoparticles in the Fe1−xCrx system, with 0<x<0.83 are reported. The results show that for x∼0.5 the metastable σ-FeCr can be stabilized and it constitutes up 60wt% of the material. The sample with the highest σ-FeCr content is further analyzed to study the structural and the magnetic properties of this phase and its thermal stability. The σ-FeCr phase is weakly magnetic with an average magnetic moment of 0.1μB per Fe atom and a Curie temperature below ∼60K. It is stable up to 550K where it starts to transform to bcc-FeCr. Annealing at 700K yields Cr2O3 due to Cr surface segregation and affects the magnetic behavior of the system, which is dominated by interparticle interactions.


Physical Review B | 2004

Effect of surface modifications on magnetic coupling in Fe nanoparticle systems

A. Ślawska-Waniewska; Anna Roig; Martí Gich; Ll. Casas; K. Racka; N. Nedelko; Elies Molins


Journal of Alloys and Compounds | 2004

Structure and magnetic properties of polymer matrix nanocomposite processed by pyrolysis of cobalt(II) acrylate

M. Ławecka; A. Ślawska-Waniewska; K. Racka; Marcin Leonowicz; I. Dzhardimalieva; A. S. Rozenberg; Anatolii D. Pomogailo


Journal of Magnetism and Magnetic Materials | 2005

Magnetic properties of Fe nanoparticle systems

K. Racka; Martí Gich; A. Ślawska-Waniewska; Anna Roig; Elies Molins


Journal of Magnetism and Magnetic Materials | 2008

Magnetic behaviour of Fe–Cr nanoparticle systems

K. Racka; A. Ślawska-Waniewska; Andrzej Krzyżewski; Martí Gich; Anna Roig; E. A. Shafranovsky; Yu. I. Petrov


Journal of Alloys and Compounds | 2006

Structural and magnetic properties of bulk alloys and aerosol nanoparticles in the Fe100-xCrx system

E. A. Shafranovsky; Yu. I. Petrov; Martí Gich; K. Racka; A. Ślawska-Waniewska; Anna Roig; Elies Molins


Journal of Magnetism and Magnetic Materials | 2008

Magnetic behaviour of FeCr nanoparticle systems

K. Racka; Anna Slawska-Waniewska; Andrzej Krzyżewski; Martí Gich; Anna Roig; E. A. Shafranovsky; Yu. I. Petrov


Journal of Applied Physics | 2005

Aerosol nanoparticles in the Fe1-xCrx system: Room-temperature stabilization of the sigma phase and sigma-->alpha-phase transformation

Martí Gich; E. A. Shafranovsky; Anna Roig; Anna Slawska-Waniewska; K. Racka; Ll. Casas; Yu. I. Petrov; Elies Molins; Micheal F. Thomas


Journal of Magnetism and Magnetic Materials | 2004

Microstructure and magnetic properties of Fe81P13Si2Nb3Cu1 nanocrystalline alloy

L.K. Varga; A. Ślawska-Waniewska; Anna Roig; K. Racka; E. Fazakas; J. Ferenc; T. Kulik


Journal of Magnetism and Magnetic Materials | 2004

Microstructure and magnetic properties of Fe 81P 13Si 2Nb 3Cu 1 nanocrystalline alloy

L.K. Varga; Anna Slawska-Waniewska; Anna Roig; K. Racka; Éva Fazakas; Jarai-Szabo Ferenc; T. Kulik

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E. A. Shafranovsky

Semenov Institute of Chemical Physics

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Yu. I. Petrov

Semenov Institute of Chemical Physics

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T. Kulik

Warsaw University of Technology

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L.K. Varga

Hungarian Academy of Sciences

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E. Fazakas

Warsaw University of Technology

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J. Ferenc

Warsaw University of Technology

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Jarai-Szabo Ferenc

Warsaw University of Technology

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