Abstract
Metal hydrides are promising as compact and safe hydrogen storage materials. Among them, the hydrides of ternary and more complex alloys are provided with properties required in modern hydride material science. In this work, the mechanism of formation of ternary alloys in TiVMn system in the “hydride cycle” mode was investigated. TiV1.2Mn0.8, TiV0.8Mn1.2, and Ti0.37V0.25Mn0.25 alloys were synthesized, their interaction with hydrogen was observed in: a) combustion mode; b) at rather low temperature (25–50 °C) after short-term activation. X-ray, DTA and chemical analysis evidenced that the hydrogen interaction with the alloys, formed in both modes, resulted in the formation of TiV1.2Mn0.8H3.7, TiV0.8Mn1.2H2.35 and Ti0.37V0.25Mn0.25H1.56 hydrides of identical structure, hydrogen content and thermal properties. These hydrides were stable at sorption-desorption cycling and during long-term (1 year) storage. Conclusion: the “hydride cycle” is an easy and affordable method of creation the ternary alloys with high hydrogen sorption properties, needed in hydrogen accumulators.
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