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Studies of hydrogen absorption-desorptionproperties and HDDR behaviour of a Nd5Co2B6ρ-boride

International Journal of Hydrogen Energy
Publication Date
DOI: 10.1016/s0360-3199(98)00074-3


Abstract In the present work the hydrogen absorption-desorption behaviour of the Nd 5Co 2B 6 ρ-boride has been studied. A two-step hydrogenabsorption, corresponding to hydrogenation and subsequent disproportionation, was observed forthis compound in the temperature range 20–860°C. The first event is associated with ananisotropic expansion of the rhombohedral lattice of intermetallic compound in the [1]direction (up to 12.4 vol%) and results in the formation of an interstitial Nd 5Co 2B 6H 7.0 type hydride. The second hydrogen absorption event, takingplace at temperatures above 800°C, results in disproportionation into NdH 3-x, NdCO 2B 2, NdB 4 and a previously unreported neodymium diborideNdB 2. A significant refinement of the microstructure occurs as a result of therecombination reaction to form the original Nd 5Co 2B 6 ρ-boride as the final step on theHydrogenation–Disproportionation–Desorption–Recombination (HDDR) process.

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