(a) Describe the different stages of the chemisorption process, in which hydrogen is absorbed into LaNi5 to form a metal hydride. Include a description of the conditions, and the effect on the microstructure of the metal.

(b) How would this process vary if the LaNi5 alloy were: a solid block (1 cm3 ); or a powder (1 m diameter powder size)?

(c) i. Describe one technique that could be used to measure how much hydrogen is absorbed by LaNi5, at three different temperatures (0, 25, and 100 C).

ii. Using the data you would expect to obtain with this technique, sketch a Pressure-Composition-Isotherm (PCI) for LaNi5H6 formation