METHOD FOR DESIGNING COMPOSITION OF PLATEAU PRESSURE CONTROALLABLE AB5 SERIES HYDROGEN STORAGE ALLOY

摘要

PURPOSE: A composition design method for an AB5-type hydrogen storage alloy capable of controlling the plateau pressure is provided to offer an economical design for a composition of a hydrogen storage alloy by excluding Nd from the alloy or adding a relatively large amount of Ce in the alloy. CONSTITUTION: A composition design method for an ab5-type hydrogen storage alloy capable of controlling the plateau pressure comprises the steps of: dissolving metals which compose an AB5-type hydrogen storage alloy to have the plateau pressure from 0.01 to 1MPa by adjusting element ratios in the alloy for obtaining the AB5-type hydrogen storage alloy(ST120); calculating the volume for a unit cell of the AB5-type hydrogen storage alloy(ST130); evaluating properties related to hydrogen storage of the AB5-type hydrogen storage alloy(ST140); performing quantitative analysis of elements and calculation of an atomic size factor of the AB5-type hydrogen storage alloy(ST150); and establishing the relation between the atomic size factor and the plateau pressure of the AB5-type hydrogen storage alloy(ST160). [Reference numerals] (ST110) Design a composition; (ST120) Melt metal; (ST130) Calculate the volume of a unit cell; (ST140) Evaluate hydrogen storage properties; (ST150) Perform quantitative analysis of elements and calculation of an atomic size factor; (ST160) Establish the relation between the atomic size factor and a plateau pressure