Pressure induced phase transition and amorphization of Na3ONO2

Abstract

The high pressure behavior of Na₃ONO₂ has been investigated by Raman spectroscopy and angle-dispersive X-ray diffraction from synchrotron radiation by using the diamond anvil cell technique. Pressure induced phase transitions and finally amorphization are observed. Starting from cubic symmetry at ambient conditions Na₃ONO₂ transforms to a rhombohedral high pressure phase at 0.7 GPa. Beyond 14.1 GPa, the crystalline structure destabilizes and amorphous state is achieved.