Phase Behaviour in Pyrazine and Tetramethylpyrazine.

DOI

Pyrazine-I is stable < 302 K, phase II exists from 302-310 K, and phase III from 310-324 K. The known phase-I forms an ordered structure. It is thought that structures of phases II & III are closely related, but neither crystal structure has been determined. Raman measurements show that pyrazine undergoes phase transition at 1 GPa. Tetramethylpyrazine has also been studied using Raman spectroscopy to 4 GPa. Pressure-induced phase transitions take place at 1.2 and 2.2 GPa. The aims of this proposal are to characterize pyrazine II & III and survey the low temperature behaviour of the compound; to study the effect of pressure on pyrazine to 5 GPa on PEARL, determining the structure of the new high-pressure phase formed at 1 GPa; to study and the effect of pressure on tetramethylpyrazine to 5 GPa on PEARL; obtain crystal structures of the high pressure phases formed at 1.2 & 2.2 GPa.

Identifier
DOI https://doi.org/10.5286/ISIS.E.24003083
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/24003083
Provenance
Creator Miss Laura Budd; Professor Bill David; Professor Simon Parsons; Dr Bill Marshall; Dr Richard Ibberson
Publisher ISIS Neutron and Muon Source
Publication Year 2010
Rights CC-BY Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact isisdata(at)stfc.ac.uk
Representation
Resource Type Dataset
Discipline Photon- and Neutron Geosciences
Temporal Coverage Begin 2007-10-15T07:05:18Z
Temporal Coverage End 2007-10-26T06:08:03Z