Electrical resistivity studies on Zr<inf>x</inf>Tb<inf>1-x</inf>Fe<inf>3</inf> (x = 0.2, 0.3) hydrides

The hydrogen absorption isotherm at 30°C in the range 0.2 ≤ P (bar) ≤20 for Zr0.2Tb0.8Fe3 and Zr0.3Tb0.7Fe3 shows the presence of α, (α + β and β phases. The study of the kinetics of hydrogen absorption in Zr0.2Tb0.8Fe3 at 30°C as a function of pressure in the range 8 ≤ P (bar) ≤50 shows the presence of different phases. The dependence of the electrical resistivity (ρ) on the hydrogen concentration in the Zr0.2Tb0.8Fe3-H and Zr0.3Tb0.7Fe3-H systems is discussed on a basis of the combined effects of depopulation of conduction electrons and formations of various phases, namely α, α + β and β. Changes in the slopes of the plots of ρ against y indicate the different phase regions.