CC BY
5I.Yu.Zavaliy*, A.B.Riabov, I.V.Saldan, V.A.Yartys
Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, Lviv, Ukraine
NEW ZIRCONIUM-BASED ALLOYS AS EFFICIENT LOW PRESSURE HYDROGEN ABSORBERS
The report presents the review of systematic studies of new hydride materials on the basis of zirconium alloys. Hydrogen absorption and desorption, the changes in the crystal structure and a number of physicochemical and magnetic properties were studied for the following Zr-based compounds: oxygen-stabilised n-phases with the structure of Ti2Ni type, Zr2M (CuAl2 type of structure) and Zr6MeX2 (Fe2P type of structure) intermetallics, where Me = Fe, Co, Ni; X = Al, Ga, Sn, In. As was shown by means of X-ray diffraction and microstructure analyses, Zr4Me2Ox (Me - Fe, Co, Ni) and Zr3Me3Ox (Me - V, Cr, Mn) alloys as well as their partially substituted derivatives contain n-phase and a main constituent. Most of synthesized oxygen-stabilised n-phases are characterised by a homogeneity range on the oxygen content, hydrogen absorption capacity being dependent on this value. In particular, the capacity of Zr3V3Ox and Zr4Fe2Ox n-phases reaches values of H/M ~ 1.6-1.8 at x ~ 0.3 oxygen content. The temperature and intensity of hydrogen desorption is shown to be also substantially dependent on oxygen content. Oxygen-stabilised Zr4Fe2Ox n-phases are found to possess increased stability of metallic matrix in comparison with Zr2Fe compound, and therefore they are less disposed toward disproportionation during the interaction with high-temperature hydrogen.
All studied alloys are efficient low-pressure hydrogen absorbers. The possibility of the use of the developed materials for pumping-out, compact storage, purification and programmed input of
hydrogen isotopes for the work of physical-technical equipment will be discussed in the talk.
*
Corresponding author, e-mail: zavaliy@ah.ipm.lviv.ua
International Scientific Journal for Alternative Energy and Ecology Copyright©2000 by STC "TATA"
July 2000, Vol. 1
181
