National Repository of Grey Literature 62 records found  beginprevious53 - 62  jump to record: Search took 0.02 seconds. 
Effect of ordering on grain boundary segregation
Lejček, Pavel ; Schneeweiss, Oldřich
A simple phenomenological model of solute segregation at partially ordered grain boundaries is proposed and used to correlate complex concentration and temperature dependences of silicon segregation in ordered Fe-Si alloys.
Fázové přechody v nanokrystalické slitině Zr-Fe indukované vodíkem
Roupcová, Pavla ; Schneeweiss, Oldřich ; Pizúrová, Naděžda ; Zhu, Min
Nanocrystalline composite based on Zr-Fe alloy is investigated. In the as-prepared powder composite ZrO2, Zr3FeH7, alpha-Fe, Fe2Zr and amorphous phases were recognized. During an annealing in vacuum crystalline and a few manner of amorphous phases transforms to ZrO2. The attempts to hydrogenate the same sample by annealing in hydrogen of the ambient pressure were successful at temperatures above - 673 K.
Příprava a vlastnosti nanokrystalů alpha-Fe and Fe3O4 v matricích MgO a TiO2
Schneeweiss, Oldřich ; Zbořil, R. ; Pizúrová, Naděžda ; Mašláň, M. ; Qiao, Yuanyuan
Preparation of the nanocrystalline composites of iron and magnetite nanoparticles embedded in MgO or TiO2 matrices is described. The results of phase analysis obtained by means of Mössbauer spectroscopy, X-ray diffraction, TEM and magnetic measurements are reported. Coercive force of the samples of the composite formed by spherical Fe3O4 (mean size -20 nm) nanoparticles was 25±1 mT and for alpha-Fe (-30nm) it was 30±1 mT. These values were not influenced by the chemical difference of the matrix materials.

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1 Schneeweiss, O.
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