Abstract
LaNi5-YAlY alloys which reversibly form hydrides are used to store, pump, and separate hydrogen isotopes during processing of tritium at the Department of Energy's Savannah River Site (SRS). Over forty alloys with nominal bulk aluminum contents (Y) from 0 to 1.16. including several made with intentional excesses and deficiencies of lanthanum, were characterized by scanning electron microscopy (SEM), energy dispersive x-ray (EDX) analysis and x-ray diffractometry (XRD) to determine distributions and compositions of constituent phases. Objectives were to produce primary LaNi5-yAly phases with desired absorption and desorption pressures for hydrogen isotopes and minimize secondary phases with undesirable absorption/desorption behaviors. Electron probe microanalysis (EPMA) was used to determine aluminum contents (y) of primary LaNi5-yAly phases. A relationship between y and hexagonal unit cell parameters was established. Pressure-composition- temperature (PCT) measurements allowed development of equations for predicting hydrogen desorption plateau pressures from XRD or EPMA data.
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