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2 Acta Physica Polonica A

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Ellipsometric Measurements of Plastically Deformed Copper

100%

Mirić M. , Rudolf R. , Anžel I. , Hadžić B. , Romčević M. , Trajić J. , Romčević N.

Acta Physica Polonica A

2009

tom 116

nr 4

715-717

Chemically pure copper (99.99) prepared in the sample of square cross-section (10×10 mm^{2}) and length about 50 mm was extremely plastically deformed with the repeated application of equal channel angular pressing. Equal channel angular pressing was applied as an effective technique for producing bulk nanoscaled structures. It is well known that severe plastic deformation of metallic materials often leads to microstructure with ultrafine grains and cross-sections which remain about equal before and after deformation. Optical properties of the sample were studied using spectroscopic ellipsometry in UV-VIS range. The parameters of the sample like copper oxide and surface roughness overlayer were calculated using two-film model together with the Bruggeman effective medium approximation.

Nanocrystalline ZnO Doped with Fe_2O_3 - Magnetic and Structural Properties

84%

Kuryliszyn-Kudelska I. , Hadžić B. , Sibera D. , Kilanski L. , Romčević N. , Romčević M. , Narkiewicz U. , Dobrowolski W.

nr 5

689-691

We have studied the magnetic properties of ZnO nanocrystals doped with Fe_2O_3 in the magnetic dopant range from 5 to 70 wt%. The nanocrystals were synthesized by wet chemical method. The detailed structural characterization was performed by means of X-ray diffraction and micro-Raman spectroscopy measurements. The results of systematic measurements of magnetic AC susceptibility as a function of temperature and frequency are presented. We observed different types of magnetic behavior. For ZnO samples doped with low content of Fe_2O_3, the results of low-field AC susceptibility are satisfactorily explained by superparamagnetic model including inter-particle interactions. With the increase of magnetic Fe_2O_3 content, the spin-glass-like behavior is observed.