SIMS Study of the Surface of Lanthanum-Based Alloys
Keywords:SIMS, surface, hydrogen, hydrides, hydrogen storage 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.
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