Phase transition and chemical decomposition of hydrogen peroxide and its water mixtures under high pressures

摘要: We have studied the pressure-induced phase transition and chemical decomposition of hydrogen peroxide its mixtures with water to 50 GPa, using confocal micro-Raman synchrotron x-ray diffractions. The results indicate that pure crystallizes into a tetragonal structure (P41212), same previously found in 82.7% H2O2 at high pressures low temperatures. (H2O2-I) is stable 15 above which transforms an orthorhombic (H2O2-II) over relatively large pressure range between 13 18 GPa. Inferring from splitting νs(O–O) stretching mode, I-to-II decreases diluted around 7 GPa for 41.7% 3 9.5%. Above H2O2-II gradually decomposes mixture H2O O2, completes 40 45 9.5% H2O2. Upon unloading, also O2 across melts, occurring 2...