Abstract
Abstract The effect of hydrogen aliquot size on the plateau pressures of, and pressure hysteresis in Zr(Fe x Cr 1− x ) 2 -hydrogen systems ( x = 0.6, 0.7, 0.8) is determined and compared with that of the LaNi 5 -hydrogen system. The existing theoretical interpretations of this effect are reviewed and an alternative explanation is provided. It is proposed that the plateau pressures and pressure hysteresis in intermetallic compound (IMC)-H systems measured with extremely small aliquots are controlled by the energy barrier for nucleation, which is built up by the elastic strain energy and interfacial energy, whereas the plateau pressures and pressure hysteresis measured with very large aliquots are governed by the energy barrier for growth, which is created by the elastic and plastic accommodation energies. Under normal experimental conditions the plateau pressures and pressure hysteresis are determined by a combined effect of the energy barriers for nucleation and growth.
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