Affordable Access

Publisher Website

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.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times

More articles like this

Further studies of hydrogenation, disproportionati...

on Journal of Alloys and Compound... Jan 01, 1997

Hydrogenation behaviour and structure of R5Fe2B6(R...

on Journal of Alloys and Compound... Jan 01, 1997

Hydrogen absorption/desorption and HDDR studies on...

on Journal of Alloys and Compound... Jan 01, 1995

A Mössbauer spectroscopy study of Nd5Fe2B6

on Solid State Communications Jan 01, 1987
More articles like this..