Qingyang Hu, Ho-kwang Mao. Role of hydrogen and proton transportation in Earth’s deep mantle[J]. Matter and Radiation at Extremes, 2021, 6(6): 068101
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Fig. 1. Escaped hydrogen as a function of pressure. Colored open circles are data points from Refs. 2 and 6. Filled circles represent the maximum nH at similar pressures and were selected for a second-order polynomial fit (dashed line, R2 = 0.96). Only data points with pure or dominant pyrite-type phase were picked for the fit. For example, the two outliers at ∼110 GPa were excluded from the fit because their x-ray diffraction patterns revealed the co-existence of contaminated phases.