Extrinsic cycling of complex hydrides

1 Pressure extrinsic cycling studies on imide/amide system 

An example of Li amide-imide pressure cycling data is presented, although there are detailed presentations in this book on thermodynamics and structure of these materials by other authors. Chandra et al. [148] determined the effect of long-term pressure cycling between (1, 56, 163, 501, and 1100 cycles) for the Li-N-H system using industrial hydrogen [hydrogen min% (v/v) 99%, water 32 ppm, O2 10 ppm, N2 400 ppm. Total hydrocarbons  

This chapter summarizes important contributions on the AB5/AB and elemental hydrides. Examples of microalloying in LaNis- and FeTi-based intermetallic hydrides have been emphasized, and there has been some discussion on elemental hydrides. Classification of testing methods for durability of alloys/ intermetallics were presented, examples of intrinsic and extrinsic tests that include cycling and aging have been reported for AB5/AB and other alloys. More recent results on extrinsic tests on lightweight complex hydrides (imide-amide) that were cycled between Li2NH/LiNH2 phases were also reported. 

19 (a) Absorption isotherms obtained after non-equilibrium pressure cycling for 1, 56, 163, 501, 1100 times with impure hydrogen (ppm levels of O2, H2O and others), (b) Corresponding ex-situ X-ray diffraction taken from the sample after each isotherm was obtained in desorbed condition. Data taken from Chandra et al. [148]. 

In general, a reasonable amount of intrinsic data is available, but extrinsic data are lacking more research is needed for the hydrides to be used in practical applications. 

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