Thermal decomposition of ammonia borane at high pressures

Johanna Nyĺn, Toyoto Sato, Emmanuel Soignard, Jeffery L. Yarger, Emil Stoyanov, Ulrich Häussermann

研究成果: Article査読

46 被引用数 (Scopus)

抄録

The effects of high pressure (up to 9 GPa) on the thermal decomposition of ammonia borane, BH3 NH3, were studied in situ by Raman spectroscopy in a diamond anvil cell. In contrast with the three-step decomposition at ambient pressure, thermolysis under pressure releases almost the entire hydrogen content of the molecule in two distinct steps. The residual of the first decomposition is polymeric aminoborane, (BH2 NH 2 x, which is also observed at ambient pressure. The residual after the second decomposition is unique to high pressure. Presumably it corresponds to a precursor to hexagonal BN where macromolecular fragments of planar hexagon layers formed by B and N atoms are terminated by H atoms. Increasing pressure increases the temperature of both decomposition steps. Due to the increased first decomposition temperature it becomes possible to observe a new high pressure, high temperature phase of BH3 NH3 which may represent melting.

本文言語English
論文番号104506
ジャーナルJournal of Chemical Physics
131
10
DOI
出版ステータスPublished - 2009
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)
  • 物理化学および理論化学

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