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- W2022307170 abstract "The hydrogen absorption and desorption characteristics of Ti-Co-Fe alloys were investigated. Alloys of composition TiCo1−xFex(x = 0.05 − 0.5) were found to have the same cubic structure as TiCo and they reacted readily with hydrogen to form the hydrides TiCo0.95Fe0.05H1.2, TiCo0.7Fe0.3H1.2 and TiCo0.5Fe0.5H1.2 (hydrogen contents, 1.1 wt.%) under a hydrogen pressure of 30 atm at room temperature. The dissociation pressures of these hydrides are dependent on the iron content x (the iron partially substitutes for the cobalt) and the value of logPH2 increases gradually with increasing x. The enthalpy change on hydride formation, determined from the dissociation isotherms for the TiCo0.5Fe0.5-H system, is −10.1 kcal (mol H2)−1; this value is smaller than those (−13.8 kcal (mol H2)−1 and −11.2 kcal (mol H2)−1 respectively) of the TiCo-H and TiCo0.5Mn0.5-H systems. The temperature required to produce a dissociation pressure of 1 atm is 70 °C, which is lower than the temperatures required for TiCo (130 °C) or TiCo0.5Mn0.5 (90 °C). A value of 6.2 kcal mol−1 was obtained for the apparent activation energy of hydrogen desorption. For TiCo0.5Fe0.5, only two cycles under mild conditions are needed for the activation treatment so the alloy can easily be activated. The hydrogen absorption-desorption cycles were repeated 30 times but no variation in the hydrogen absorption-desorption capacity was observed. The hydride of TiCo0.5Fe0.5 proved to be suitable for use as a hydrogen storage material." @default.
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- W2022307170 date "1981-08-01" @default.
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- W2022307170 title "Hydrogen absorption-desorption characteristics of Ti-Co-Fe Alloys" @default.
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- W2022307170 doi "https://doi.org/10.1016/0022-5088(81)90091-6" @default.
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