Nitrosonium-nitrate and dinitrogen pentoxide ionic crystals were synthesized by laser heating of a condensed oxygen-rich mixture compressed to different pressures, up to 40 GPa, in a diamond anvil cell (DAC). High-pressure/high-temperature Raman and X-ray diffraction studies of synthesized samples disclosed a transformation of compound to crystal at temperatures above ambient and pressures below 9 GPa. High-pressure experiments revealed previously unreported bands in Raman spectra of and ionic crystals. Structural properties of both ionic compounds are analyzed. Obtained experimental results support a hypothesis of a rotational disorder of complexes in and indicate a rotational disorder of ionic complexes in solid.

High-pressure laser heating of oxygen-rich mixtures can synthesize ionic crystals, revealing previously unreported bands in Raman spectra and indicating rotational disorder of ionic complexes in solids.

High-Pressure Synthesis and Study of and Ionic Solids

Key Takeaway: High-pressure laser heating of oxygen-rich mixtures can synthesize ionic crystals, revealing previously unreported bands in Raman spectra and indicating rotational disorder of ionic complexes in solids.