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Title: Hydrogen solubility studies in Zr0.2Tb0.8Fe1.5Co1.5
Authors: Sivakumar, R.
Ramaprabhu, S.
Rama Rao, K.V.S.
Mayer, B.
Schmidt, P.C.
Keywords: Crystal lattices
Gas absorption
Reaction kinetics
X ray powder diffraction
Zirconium terbium iron cobalt alloy
Zirconium alloys
Issue Date: 2000
Publisher: Elsevier Science Ltd, Exeter, United Kingdom
Citation: International Journal of Hydrogen Energy, 25(9), 861-869
Abstract: The hydrogen solubility studies in a PuNi3-type alloy Zr0.2Tb0.8Fe1.5Co1.5 are performed in the ranges 75�T (�C)�150 and 0.1�P (bar)�30. The hydrogen solubility properties are compared with those of Zr0.2Tb0.8Fe3 and Zr0.1Tb0.9Fe1.5Co1.5. The plateau pressure of Zr0.2Tb0.8Fe1.5Co1.5-H at any given temperature is higher than that of Zr0.1Tb0.9Fe1.5Co1.5-H. The lattice is accompanied by an expansion of about 17% upon hydriding the alloy, retaining its parent alloy (PuNi3-type) structure. The thermodynamical parameters (?HH and ?SH) of the dissolved hydrogen are evaluated and compared with those of Zr0.2Tb0.8Fe3-H and Zr0.1Tb0.9Fe1.5Co1.5-H. The different phases of the alloy-hydrogen system are identified from the variation of ?HH, ?SH with y, which agree well with those seen in the hydrogen absorption isotherms. These phases are further confirmed through powder X-ray diffraction studies at appropriate hydrogen concentrations. From the studies on kinetics of hydrogen absorption, it is found that the rate of reaction in Zr0.2Tb0.8Fe1.5Co1.5 is faster than that in Zr0.1Tb0.9Fe1.5Co1.5, and slower than that in Zr0.2Tb0.8Fe3.
ISSN: 3603199
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