Pressure-induced structural changes in Methylamine borane and dimethylamine borane

Petra A. Szilagyi*, Steven Hunter, Carole A. Morrison, Chiu C. Tang, Colin R. Pulham

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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. (C) 2017 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)953-961
Number of pages9
JournalJournal of alloys and compounds
Volume722
Early online date17 Jun 2017
DOIs
Publication statusPublished - 25 Oct 2017

Keywords

  • Hydrogen storage
  • Phase transition
  • High pressure
  • Synchrotron X-ray powder diffraction
  • HYDROGEN-STORAGE MATERIALS
  • X-RAY-DIFFRACTION
  • MAGNESIUM BOROHYDRIDE MG(BH4)(2)
  • AMMONIA-BORANE
  • CRYSTAL-STRUCTURE
  • CATALYTIC DEHYDROCOUPLING/DEHYDROGENATION
  • THERMAL-DECOMPOSITION
  • DIHYDROGEN BOND
  • AMINE-BORANES
  • DEHYDROGENATION

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