High-pressure synthesis and tudy of NO+NO 3 - And NO 2 +NO 3 - Ionic solids

Abstract

Nitrosonium-nitrate NO+NO 3 - and dinitrogen pentoxide NO 2 +NO 3 - ionic crystals were synthesized by laser heating of a condensed oxygen-rich O 2 -N 2 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 NO-NO 3 - compound to NO 2 + NO 3 - crystal at temperatures above ambient and pressures below 9 GPa. High-pressure experiments revealed previously unreported bands in Raman spectra of NO + NO 3 - and NO 2+NO 3 - ionic crystals. Structural properties of both ionic compounds are analyzed. Obtained experimental results support a hypothesis of a rotational disorder of NO+ complexes in NO+NO 3 - and indicate a rotational disorder of ionic complexes in NO 2+NO 3 - solid.