Hydrogen sorption properties of the La1-xCaxNi5 and La(Ni1-xCux)5 systems

J. Shinar; D. Shaltiel; D. Davidov; A. Grayevsky

doi:10.1016/0022-5088(78)90177-7

Hydrogen sorption properties of the La_1-xCa_xNi₅ and La(Ni_1-xCu_x)₅ systems

J. Shinar^*
, D. Shaltiel
, D. Davidov
, A. Grayevsky

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

The hydrogen sorption properties of the Lai_1-xCa_xNi₅ and La(Ni_1-x Cu_x5 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 Ca_0.3La _0.7Ni₅. In the Ca_0.3La_0.7Ni₅-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(Ni_1-xCu_x)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.

Original language	English
Pages (from-to)	209-219
Number of pages	11
Journal	Journal of the Less-Common Metals
Volume	60
Issue number	2
DOIs	https://doi.org/10.1016/0022-5088(78)90177-7
State	Published - Aug 1978

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10.1016/0022-5088(78)90177-7

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title = "Hydrogen sorption properties of the La1-xCaxNi5 and La(Ni1-xCux)5 systems",

abstract = "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.",

author = "J. Shinar and D. Shaltiel and D. Davidov and A. Grayevsky",

year = "1978",

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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.

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Hydrogen sorption properties of the La_1-xCa_xNi₅ and La(Ni_1-xCu_x)₅ systems

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