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Investigation of ZrFe2 and ZrCo2 Under Very High Pressure of Gaseous Hydrogen and Deuterium

100%

Filipek S. M. , Jacob I. , Paul-Boncour V. , Percheron-Guegan A. , Marchuk I. , Mogilyanski D. , Pielaszek J.

tom Vol. 75, nr 12

1921-1926

New hydrides and deuterides of Laves cubic phases ZrFe2 and ZrCo2 were synthesized by high hydrogen (deuterium) pressure technique. For both Laves phases the symmetry of lattice does not change but a large expansion of lattice parameter (by 8% for ZrFe2 and by 4.5% for ZrCo2) occurs during hydrides (deuterides) formation. In contrast to the rela-tively stable hydride (if stored in an inert atmosphere) formed in ZrFe2, the ZrCo2H2 de-composes easily at 25°C. Large lattice expansion of ZrFe2 during the deuteride formation changes only slightly its magnetic properties.

Structural and hydriding properties of the AB2-system with nanostructure.

32%

Jurczyk M. , Leda H. , Rajewski W.

tom R. XIX, nr 4

892-896

The ZrV2/Ni and Zr0.35Ti0.65V0.85Cr0.25Ni1.30 alloy powders of nanometric -scale were succesfully synthesized by high-energy ball milling (HEBM) of precursor alloys in an argon atmosphere at room temperature. The relations between their structural and hydriding properties were investigated in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM) as well as by P-C-T and electrochemical measurements. In this work, we have found that electrochemical activity of ZrV2 can be simulated by HEBM of the alloy powder with Ni powder. X-ray and SEM analyses indicated that the elemental nickel is distributed on the surface of HEBM alloy particles homogeneously. The nanocomposite ZrV2/Ni powders showed an improved discharge capacity.