High-pressure studies of melamine

We performed the first high-pressure study of melamine using X-ray Raman spectroscopy (XRS) up to ∼17 GPa in a diamond anvil cell at ambient temperature. We utilized the 16 ID-D undulator beamline at the Advanced Photon Source for the X-ray source. The observed diminishment of the 1s→π* peak as well...

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Bibliographic Details
Published in:High pressure research 2010-03, Vol.30 (1), p.65-71
Main Authors: Pravica, Michael, Kim, Eunja, Tkachev, Sergey, Chow, Paul, Xiao, Yuming
Format: Article
Language:English
Subjects:
Alkalies
DENSITY FUNCTIONAL METHOD
Diffraction
high pressure
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MELAMINE
PHASE TRANSFORMATIONS
Pressure
Pressure measurement
PRESSURE RANGE
RAMAN SPECTROSCOPY
Spectrum analysis
Temperature effects
X-ray diffraction
X-ray Raman spectroscopy
X-RAY SPECTROSCOPY
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Summary:We performed the first high-pressure study of melamine using X-ray Raman spectroscopy (XRS) up to ∼17 GPa in a diamond anvil cell at ambient temperature. We utilized the 16 ID-D undulator beamline at the Advanced Photon Source for the X-ray source. The observed diminishment of the 1s→π* peak as well as other changes in the XRS spectra with pressure suggest the possibility of intra- and inter-molecular bonding changes due to two phase changes in the investigated pressure range or hybridization changes of atomic orbitals in the material with pressure. We also performed a complementary X-ray powder diffraction study of neat melamine up to 24 GPa observing at least two phase transitions with pressure. Pressure cycling indicated that the phase transitions were reversible. Density-functional theory calculations performed on the system at ambient and low pressure show a high level of agreement with the experiments.
ISSN:0895-7959
1477-2299
DOI:10.1080/08957951003629854