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Dive into the research topics where G. Zolnierkiewicz is active.

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Featured researches published by G. Zolnierkiewicz.


Journal of Applied Physics | 2007

Magnetic frustration in the site ordered Mg3Fe4(VO4)6 vanadate

N. Guskos; Vlassis Likodimos; S. Glenis; G. Zolnierkiewicz; J. Typek; R. Szymczak; Anna Blonska-Tabero

The magnetic properties of the site ordered multicomponent vanadate Mg3Fe4(VO4)6 are studied using dc magnetization and electron paramagnetic resonance (EPR) measurements. The static susceptibility shows antiferromagnetic interactions between Fe3+ spins with a Curie-Weiss temperature Θ=−111(1)K, while a transition to a spin-glass-like state is observed at T≈8.5K, indicating appreciable spin frustration. EPR measurements corroborate the presence of antiferromagnetically coupled Fe3+ spins from high temperatures, while a distinct change in the temperature variation of the EPR parameters is observed at T<80K, complying with the mean-field energy scale provided by the Curie-Weiss temperature of the system. The resulting magnetic inhomogeneity that persists despite the absence of cation disorder between magnetic and diamagnetic metal ions is attributed to the presence of small amounts of oxygen deficiency that modifies the connectivity and superexchange coupling between Fe3+ spins and leads to a disordered mag...


Journal of Physics: Conference Series | 2009

The preparation and EPR study of nanocrystalline ZnFe2O4

Daniel Sibera; Urszula Narkiewicz; N. Guskos; G. Zolnierkiewicz

Nanocrystalline zinc oxide doped with different concentrations of Fe2O3(from 5 to 50 wt.%) has been prepared by means of coprecipitation and calcination processes. Depending on the chemical composition, phases of hexagonal ZnO, and/or cubic ZnFe2O4 were identified. The mean crystallite size of the latter phase, determined using the Scherrers formula, varied from 8 to 12 nm. The EPR spectra for six different concentrations of Fe2O3 were recorded. A symmetrical, very intense and broad EPR resonance line has been obtained for the all the samples where the intensity strongly depended on the ratio of ZnO/Fe2O3 in the samples. The resonance field slightly shifted in the direction of lower magnetic field and the integrated intensities increased with increasing concentration of magnetic nanoparticles of ZnFe2O4, where the linewidth showed an extraordinary behaviour. The dipole-dipole interaction depended essentially on the concentration of magnetic nanoparticles.


Journal of Alloys and Compounds | 2009

Competition of magnetic interactions in M3Fe4V6O24 (M(II) = Zn, Cu, Mn, Mg) compounds studied by EPR

G. Zolnierkiewicz; N. Guskos; J. Typek; E.A. Anagnostakis; Anna Blonska-Tabero; M. Bosacka


Journal of Non-crystalline Solids | 2006

EPR and TGA study of two Zn3Fe4V6O24−x samples prepared by different thermal treatments

G. Zolnierkiewicz; N. Guskos; J. Typek; Anna Blonska-Tabero


Journal of Non-crystalline Solids | 2008

Study of mechanical properties of concrete with low concentration of magnetic nanoparticles

J. Blyszko; W. Kiernozycki; N. Guskos; G. Zolnierkiewicz; J. Typek; Urszula Narkiewicz; Marcin Podsiadły


Journal of Non-crystalline Solids | 2006

Magnetic properties of the Mg2FeV3O11−x site-disordered vanadate

N. Guskos; V. Likodimos; J. Typek; G. Zolnierkiewicz; R. Szymczak; Anna Blonska-Tabero


Journal of Non-crystalline Solids | 2008

Magnetic properties of TiCx/C nanocomposites

N. Guskos; Vlassis Likodimos; S. Glenis; G. Zolnierkiewicz; J. Typek; C. L. Lin; A. Biedunkiewicz


Journal of Non-crystalline Solids | 2006

EPR study of disorder processes in the ternary vanadate Zn2FeV3O11−x compound

N. Guskos; V. Likodimos; J. Typek; G. Zolnierkiewicz; Anna Blonska-Tabero


Applied Magnetic Resonance | 2008

EPR Study of Defect Centers in New Mg2InV3O11 Vanadate

G. Zolnierkiewicz; J. Typek; N. Guskos; M. Bosacka


Journal of Alloys and Compounds | 2009

Ageing effect in nanocrystalline TiCx/C studied by EPR

N. Guskos; J. Typek; Tomasz Bodziony; G. Zolnierkiewicz; M. Maryniak; A. Biedunkiewicz

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J. Typek

Szczecin University of Technology

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N. Guskos

National and Kapodistrian University of Athens

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Anna Blonska-Tabero

Szczecin University of Technology

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Vlassis Likodimos

National Technical University of Athens

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S. Glenis

National and Kapodistrian University of Athens

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A. Biedunkiewicz

Szczecin University of Technology

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M. Bosacka

Szczecin University of Technology

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Nikolaos Guskos

National and Kapodistrian University of Athens

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R. Szymczak

Polish Academy of Sciences

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Urszula Narkiewicz

Szczecin University of Technology

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