Sep 12 – 17, 2010
CERN
Europe/Zurich timezone
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Electric field gradients in nanoparticles of HfAl2 and HfAl3 intermetallic compounds

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500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

CH - 1211 Geneva 23 Switzerland
72
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POSTER Surfaces, Interfaces, Thin Films, Nano-structures

Speaker

Dr Agnieszka Kulinska (IFJ PAN)

Description

Perturbed angular correlation (PAC) method was applied to study the electric field gradients in nanopowders of the HfAl2, HfAl3 and Hf2Al3 intermetallic compounds, obtained via mechanical alloying or after ball milling of the thermally alloyed compound. The influence of the ball milling procedure on the experimentally obtained hyperfine interaction parameters was determined. A strong dependence of the PAC pattern on the milling time was evidenced and attributed to the structural disorder. The thickness of the outer damaged part of the grains depends on the crystallographic structure of the milled material. In HfAl3 sample, we observed the influence of the milling procedure on the phase transformation. The mechanical alloying process causes serious and stable damage in the powder particle of HfAl2 sample, these defects cannot be removed by annealing up to 900 C. In the Hf2Al3 sample after 60 minutes of milling and subsequent annealing at 700 C, the decomposition of Hf2Al3 into two phases HfAl and HfAl2 was observed. The quadrupole frequency distribution  increased with decreasing grain size (see Fig. 1.).
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Primary author

Co-author

Prof. Pawel Wodniecki (IFJ PAN)

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