Comments on the crystal structures of typical hydrogen-metal phases

3 Comments on the crystal structures of typical hydrogen-metal phases. 

A few general remarks about a group of metal-hydrogen phases have been included in 3.8.4.1 where interstitial hydrogen solutions in metallic structures have been described. However, as previously observed, a number of intermediate phases are also formed in several systems. A short summary of these is shown in Table 5.2 where their formulae very often have only an indicative character and several structure types correspond to more or less extended solid solution ranges. 

Notice that most of the indicated prototypes correspond to structures frequently found not only in intermetallic phases but also in ionic compounds. 

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