Predictive criteria for low-hysteresis metal hydrides (materials research). Final report on Phase, 1 January-July 1984
Principles for formulating and processing alloys which exhibit minimal-pressure hysteresis during the absorption and desorption of hydrogen were sought. The study focused on the AB5-type, rare-earth transition metal hydrides, typified by LaNi5. Three types of hysteresis were identified: dynamic, static, and activation hysteresis. Data from the literature and from the study show that static hysteresis can be virtually eliminated. For activation hysteresis, the amount of work needed to fully activate a hydride alloy can be reduced by metallurgical methods and by milling the materials extensively prior to activation. Finally, it was found that true thermodynamic equilibrium can be reached experimentally by cyclic methods.
- Research Organization:
- Hydrogen Consultants, Inc., Denver, CO (USA)
- OSTI ID:
- 6872042
- Report Number(s):
- PB-87-126264/XAB
- Country of Publication:
- United States
- Language:
- English
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