High-Pressure Synthesis and Study of NO⁺NO₃⁻ and NO₂⁺NO₃⁻ Ionic Solids

Figure 4

Raman spectra and vibrational modes assignment for (a) O₂-N₂ mixture before laser heating,  (b) mixture of NO⁺NO₃⁻ and NO₂⁺NO₃⁻ ionic solids after laser heating (vibrational modes of NO⁺NO₃⁻ are identified), (c) NO₂⁺NO₃⁻ at 3.7 GPa and 500 K, (d) NO₂⁺NO₃⁻ at 25 GPa and room temperature.