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Single crystals of β-glycine were studied at pressures up to 7.6GPa in a diamond anvil cell (DAC) in situ by Raman spectroscopy and polarized optical microscopy. A reversible phase transition was observed at 0.76GPa. A boundary between the two phases could be observed in the microscope if the phase transition was slow enough. The phase transition was accompanied by cracking of the crystal. The birefringence...
The crystals of a new melaminium salt, i.e. melaminium butyrate were obtained by slow evaporation of an aqueous solution at room temperature. The room temperature powder infrared and R'aman measurements were carried out. DSC measurements clearly point to the occurrence of the phase transition of the first order at ca, 239 K. No detectable signal was observed during powder test for second harmonic...
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