Disproportionation of SO2 at High Pressure and Temperature

• DOI: 10.1103/physrevlett.128.106001
• Publication Date: 2022-03-10T15:13:22Z
• Authors: Wencheng Lu; Siyu Liu; Guangtao Liu; Kun Hao; Mi Zhou; Pengyue Gao; Hongbo Wang; Jian Lv; Huiyang Gou; Guochun Yang; Yanchao Wang; Yanming Ma
• Keywords: 0301 basic medicine; 03 medical and health sciences

Materials once suffered at high-pressure and high-temperature (HPHT) conditions often exhibit exotic phenomena that defy conventional wisdom. The behaviors of sulfur dioxide (SO_{2}), one the archetypal simple molecules, HPHT have attracted a great deal attention due to its relevance S cycle between deep Earth atmosphere. Here we report discovery an unexpected disproportionation SO_{2} via bond breaking into elemental trioxide (SO_{3}) through jointly experimental theoretical study. Measured x-ray diffraction Raman spectroscopy data allow us solve unambiguously crystal structure (space group R3[over ¯]c) resultant SO_{3} phase shows extended framework formed by vertex-sharing octahedra SO_{6}. Our findings lead significant extension diagram suggest SO_{2}, despite abundance in Earth's atmosphere ubiquity other giant planets, is not stable compound relevant planetary interiors, providing important implications for elucidating chemistry planets.