TY - JOUR
T1 - Hydrogen sorption properties of the La1-xCaxNi5 and La(Ni1-xCux)5 systems
AU - Shinar, J.
AU - Shaltiel, D.
AU - Davidov, D.
AU - Grayevsky, A.
PY - 1978/8
Y1 - 1978/8
N2 - The hydrogen sorption properties of the Lai1-xCaxNi5 and La(Ni1-x Cux5 systems were investigated at various temperatures and at pressures up to 20 atm. It was found that initial substitution of La by Ca in LaNi5 caused an increase in the hydrogen dissociation pressure, up to Ca0.3La 0.7Ni5. In the Ca0.3La0.7Ni5-CaNi5 range, the dissociation pressure decreased. The absorption capacity of CaNi5 was dependent on the purity of the sample and increased significantly at low temperatures. The stability of La(Ni1-xCux)5 hydrides increased linearly from LaNi5 to LaCu5. These features are discussed in the light of existing models of ternary and pseudoternary hydride stability. Finally, the role of the measured change in entropy ΔS in determining the occupied interstitial sites in the hydride is outlined and discussed in relation to these systems.
AB - The hydrogen sorption properties of the Lai1-xCaxNi5 and La(Ni1-x Cux5 systems were investigated at various temperatures and at pressures up to 20 atm. It was found that initial substitution of La by Ca in LaNi5 caused an increase in the hydrogen dissociation pressure, up to Ca0.3La 0.7Ni5. In the Ca0.3La0.7Ni5-CaNi5 range, the dissociation pressure decreased. The absorption capacity of CaNi5 was dependent on the purity of the sample and increased significantly at low temperatures. The stability of La(Ni1-xCux)5 hydrides increased linearly from LaNi5 to LaCu5. These features are discussed in the light of existing models of ternary and pseudoternary hydride stability. Finally, the role of the measured change in entropy ΔS in determining the occupied interstitial sites in the hydride is outlined and discussed in relation to these systems.
UR - http://www.scopus.com/inward/record.url?scp=0018004817&partnerID=8YFLogxK
U2 - 10.1016/0022-5088(78)90177-7
DO - 10.1016/0022-5088(78)90177-7
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AN - SCOPUS:0018004817
SN - 0022-5088
VL - 60
SP - 209
EP - 219
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
IS - 2
ER -