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Pressure-induced structural changes in Methylamine borane and dimethylamine borane

DOI: 10.1016/j.jallcom.2017.06.174 DOI Help

Authors: Petra Szilagyi (University of Greenwich) , Steven Hunter (University of Edinburgh) , Carole A. Morrison (University of Edinburgh) , Chiu C. Tang (Diamond Light Source) , Colin R. Pulham (University of Edinburgh)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds

State: Published (Approved)
Published: June 2017
Diamond Proposal Number(s): 6823

Abstract: Methylamine borane and dimethylamine borane have been studied under compression to 3 GPa using Raman spectroscopy and synchrotron powder X-ray diffraction. Both undergo reversible pressure-induced structural changes in this pressure range. The structural changes in the case of methylamine borane may be indicative of a second-order phase transition, taking place between ca. 0.8–1.2 GPa, which does not result in a change of space-group symmetry. In the case of dimethylamine borane, however, a reversible, reconstructive phase transition (monoclinic → orthorhombic) occurs below 0.7 GPa. This new high-pressure phase was successfully indexed, with a possible space group assignment of Pccn or Pbcn.

Journal Keywords: Hydrogen storage; Phase transition; High pressure; Synchrotron X-ray powder diffraction

Subject Areas: Chemistry, Energy


Instruments: I11-High Resolution Powder Diffraction