Pressure-dependent deuterium reaction pathways in the Li-N-D system

Bull, DJ; Weidner, E; Shabalin, I; Telling, MTF; Jewell, CM; Gregory, DH; Ross, DK

Abstract

Neutron diffraction data from in situ deuteration and dedeuteration of Li3N are presented under
different pressure regimes, whereby reaction pathways differing from the widely reported
stoichiometric pathway of Li3N + 2D22Li2ND + LiD + D22LiND2 + 2LiD are
observed. At sufficiently high pressures, where the deuterium chemical potential is comparable
with the heat of amide formation, the reaction appears to be driven straight to the amide plus
deuteride phase mixture. At lower pressures, a cubic phase exhibiting a concentration-dependent
variation in lattice parameter is observed. In dedeuteration, two sets of reflections from cubic
structures with distinct lattice parameters are observed, both of which exhibit a continual decrease
in cell volume. The reaction pathways are discussed in terms of the compositional variation.

Citation

Bull, D., Weidner, E., Shabalin, I., Telling, M., Jewell, C., Gregory, D., & Ross, D. (2010). Pressure-dependent deuterium reaction pathways in the Li-N-D system. Physical Chemistry Chemical Physics, 12, 2089-2097. https://doi.org/10.1039/b903821n

• Journal Article Type: Article
• Publication Date: Jan 1, 2010
• Deposit Date: Nov 25, 2010
• Journal: Physical Chemistry Chemical Physics
• Print ISSN: 1463-9076
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 12
• Pages: 2089-2097
• DOI: https://doi.org/10.1039/b903821n
• Publisher URL: http://dx.doi.org/10.1039/b903821n
• Additional Information: Corporate Creators : University of Salford, Rutherford Appleton Laboratory