Abstract
The transition from low concentrated solutions of hydrogen in metals to hydride phases is treated from the point of view of the thermodynamic stability condition. The necessity for an increase of the hydrogen concentration in the metallic matrix is exposed. The available methods for creation of active hydrogen are reviewed. The simplicity of various kinetic procedures is outlined. The preference of the high pressure equilibrium method is clearly demonstrated. Recently used high pressure devices are shortly described whereby the limitations and difficulties are discussed. Properties possible to be directly investigated “in situ” conditions are enumerated. Examples of hydrides requiring high pressure of gaseous hydrogen for formation under equilibrium conditions are given. Transition metals like nickel, chromium, cobalt, manganese, molybdenium and rhodium as well as their alloys are mentioned. Some secondary properties possible to be measured are described. Conclusions and further perspectives of the high pressure technique are discussed.
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