The initial stages of the reaction between ZrCo and hydrogen studied by hot-stage microscopy

Density functional study of vibrational, thermodynamic and elastic properties of ZrCo and ZrCoX3 (X=H, D and T) compounds

“…The ratio for ZrCo is larger than 1.75, and the results suggest that the ZrCo phase is ductile in nature which is supported by the calculated Cauchy pressure in this study. It has recently been reported that elastic properties, specially ductility, bulk to shear modulus ratio (B/G), Poisson's ratio (m), etc., are related to the initial hydriding mechanism [63]. In this present study, the B/G value of ZrCoH 3 has been calculated and compound with those of other hydrides available in literature [64][65][66][67][68] are listed in Table 5.…”

Synthesis of Hydrogen Getter Zr1-xCox (x=0-1) Alloy Films by Magnetron Co-Sputtering

“…However, in the second and third cycles, the change in the resistance was found to be almost constant. The first hydrogen cycle activates the film surface by removing the surface contamination like adsorbed oxygen, hydroxide, and carbon oxide molecules [24]. The resistance of film increases due to the ionization of hydrogen molecule adsorbed on the surface by taking the electron from the film as depicted in eq.…”

The hydriding kinetics of bulk metallic holmium under 1bar H2 and below 570K

“…Nuclei are growing near the sample's surface only. 5. At time t f the nuclei overlap completely and the sample is entirely covered with a continuous hydride layer.…”

“…d A nucleation and growth intrinsic kinetic parameter defined in Eq. (5). e Here U s is the surface growth velocity of the hydride nuclei and N 0 /S 0 is the density of the nucleation sites.…”

“…It is impossible to analyze unequivocally such kinetics without additional information since it can be described by many different models [1][2][3]. Two important approaches aimed to provide such additional information are the metallographic investigation of partially reacted sample [1] and in situ observation of the sample's surface during exposure to hydrogen using hot stage microscopy (HSM) [4,5]. Based on these direct observations it is now known that the hydriding reaction of many hydride forming metals (uranium, transition metals and rare earths) involve a series of the following consecutive steps [4]:…”