SIMS Study of the Surface of Lanthanum-Based Alloys
The results of researches of the surfaces of intermetallic alloys LaNi5, LaNi4.75Al0.25, and LaNi4.5Al0.5 with the use of secondary ion mass spectrometry are presented. It is shown that, at hydrogen partial pressures of 10^−7 – 10^−2 Pa and temperatures of 300–900 K, the processes of hydrogen interaction with the examined alloys take place only at the alloy surface and in its near-surface region. In the temperature interval from the room one to 500 K, hydrogen diffuses in appreciable amounts to depths of up to 10 monolayers. As the temperature increases, the amount of hydrogen-containing chemical compounds on the surface and in the near-surface region decreases, whereas the amount of carbides and oxides of the alloy components increases. As hydrogen is accumulated on the surface, a hydrogen-containing structure is formed, in which nickel atoms are chemically bonded with two, and lanthanum atoms with more than two hydrogen atoms.
B.A. Kolachev, R.E. Shalin, A.A. Ilyin. Hydrogen Storage Alloys (Metallurgiya, 1995) (in Russian).
J.H.N. van Vucht, F.A. Kuijpers, H.C.A.M. Bruning. Reversible room-temperature absorption of large quantities of hydrogen by intermetallic compounds. Philips Res. Repts. 25, 133 (1970).
V.M. Azhazha, M.A. Tikhonovskii, A.G. Shepelev, Yu.P. Kurilo, T.A. Ponomarenko, D.V. Vinogradov. Materials for hydrogen storage: Analysis of development trends based on information flow data. Vopr. At. Nauki Tekhn. No. 1, 145 (2006) (in Russian).
P. Dantzer. Properties of intermetallic compounds suitable for hydrogen storage applications. Mater. Sci. Eng. 329-331, 313 (2000).
B.P. Tarasov, M.V. Lototskii, V.A. Yartys. The problem of hydrogen storage and the prospects for using hydrides for hydrogen accumulation. Ross. Khim. Zh. 50, No. 6, 34 (2006) (in Russian).
S. Luo, J.D. Clewley, T.B. Flanagan, R.C. Bowman, L.A. Wade. Further studies of the isotherms of LaNi5− Sn –H for x = 0 − 0.5. J. Alloys Compd. 267, 171 (1998).
A.N. Perevezentsev, B.M. Andreev, V.K. Kapyshev, L.A. Rivkis, M.P. Malek, V.M. Bystritskii, V.A. Stolupin. Hydrides of intermetallic compounds and alloys, their properties and applications in nuclear engineering. Fiz. Elem. Chast. At. Yadra 19, 1386 (1988) (in Russian).
T. Takeshita, S.K. Malik, W.E. Wallace. Hydrogen absorption in RNi4Al (R = rare earth) ternary compounds. J. Solid State Chem. 23, 271 (1978).
M.H. Mendelsohn, D.M. Gruen, A.E. Dwight. The effect of aluminum additions on the structural and hydrogen absorption properties of AB5 alloys with particular reference to the LaNi5− Al ternary alloy system. J. Less Common Metals 63, 193 (1979).
L.G. Shcherbakova, Yu.M. Solonin, Ye.N. Severyanina. Influence of metal substitute on electrochemical and sorption characteristics of LaNi5 based alloys. In Carbon Nanomaterials in Clean Energy Hydrogen Systems, edited by B. Baranowski, S.Yu. Zaginaichenko, D.V. Schur, V.V. Skorokhod, A.Veziroglu (Springer, 2008), p. 645.
H. Diaz, A. Percheron-Guegan, J.C. Achard, C. Chatillon, J.C. Mathieu. Thermodynamic and structural properties of LaNi5− Al compounds and their related hydrides. Int. J. Hydrogen Energy 4, 445 (1979).
P.D. Goodell. Cycling hydriding response of LaNi5 in hydrogen containing oxygen as a minor impurity. J. Less Common Metals 89, 45 (1983).
K. Suzuki, K. Ishikawa, K. Aoki. Degradation of LaNi5 and LaNi4.7Al0.3 Hydrogen-absorbing alloys by cycling. Mater. Trans. JIM 41, 581 (2000).
J.I. Han, J.Y. Lee. Influence of oxygen impurity on the hydrogenation properties of LaNi5, LaNi4.7Al0.3 and MmNi4.5Al0.5 during long-term pressure-induced hydriding-dehydriding cycling. J. Less Common Metals 152, 329 (1989).
P. Dantzer. Static, dynamic and cycling studies on hydrogen in the intermetallics LaNi5 and LaNi4.77Al0.22. J. Less Common Metals 131, 349 (1987).
R.C. Bowman, D.M. Gruen, M.H. Mendelsohn. NMR studies of hydrogen diffusion in -LaNi5− Al hydrides. Solid State Commun. 32, 501 (1979).
R.C. Bowman, B.D. Craft, A. Attalla, M.H. Mendelsohn, D.M. Gruen. Role of aluminum substitution on hydrogen diffusion in -LaNi5− Al H. J. Less Common Metals 73, 221 (1980).
C.E. Lundin, F.E. Lynch, C.B. Magee. A correlation between the interstitial hole sizes in intermetallic compounds and the thermodynamic properties of the hydrides formed from those compounds. J. Less Common Metals 56, 19 (1977).
W.E. Wallace, E.B. Boltich. Reduction of hydrogen solubility by alloying RNi5 systems with Al. J. Solid State Chem. 33, 435 (1980).
C. Lartigue, A. Percheron-Guegan, J.C. Achard. Thermodynamic and structural properties of LaNi5− Mn compounds and their related hydrides. J. Less Common Metals 75, 23 (1980).
L. Schlapbach, A. Seiler, F. Stucki, H.C. Siegmann. Surface effects and the formation of metal hydrides. J. Less Common Metals 73, 145 (1980).
V.A. Litvinov, A.G. Koval, B.M. Fizgeer. On the energy spectra of secondary ions sputtered from the surface of certain metals and their oxides. Izv. Akad Nauk SSSR Ser. Fiz. 55, 2423 (1991) (in Russian).
V.A. Litvinov, V.T. Koppe, V.V. Bobkov. SIMS investigations of hydrogen interaction with a zirconium getter alloy surface. Bull. Russ. Acad. Sci. Phys. 76, 553 (2012).
A.A. Radtsig and B.M. Smirnov, Handbook on Atomic and Molecular Physics (Atomizdat, 1980) (in Russian).
R. Dobrileit, H. Zuchner. SIMS investigations on the SmCo5D and LaNi5H systems. Z. Naturforsch. A 50, 533 (1995).
H. Zuchner, J. Kintrup, R. Dobrileit, I. Untiedt. Chemical structure and bonding characteristics of metal hydrogen systems studied by the surface analytical techniques SIMS and XPS. J. Alloys Compd. 293–295, 202 (1999).
P. Joyes. Sur la formation d'ions polyatomiques secondaires. J. Phys. (Paris) 44, 221 (1983).