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Evaporation kinetics of forsterite in H2-H2O gas mixtures
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DOI：10.1016/j.gca.2026.07.046.png)
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Abstract
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Effects of ambient gas are important for understanding evaporation of planetary materials in the protosolar disk. In this study, we experimentally investigated the evaporation kinetics of forsterite in H2-H2O gas mixtures to elucidate the dependences on H2O abundance at PH2O/PH2 of 10−4–10−2, temperatures of 1400–1600 K, and a total pressure of 1 Pa. We found that the evaporation rate decreases with increasing PH2O/PH2 with a reaction order of −1.02 ± 0.12 only above certain PH2O/PH2 (10−3–10−2 depending on temperature). The activation energy increased when the evaporation is suppressed by H2O (497 ± 11 kJ mol−1, while 359 ± 1 kJ mol−1 without the effect of H2O). The PH2O/PH2 dependence of the evaporation rate is consistent with the previously proposed model based on the chemical equilibrium consideration and the Hertz-Knudsen equation. This consistency can be explained in terms of a reaction mechanism. Based on the experimentally determined evaporation kinetics, we evaluated conditions of the protosolar disk where H2O affects evaporation of forsterite dust. This showed that H2O suppresses the evaporation at ≲1300 K at PH2O/PH2 of the Solar abundance and ≲1600 K under H2O-enriched conditions, which possibly affected moderate-temperature thermal processing of silicate dust and evaporation of chondrule melt under oxidizing conditions.
Keywords:
Evaporation
Kinetics
Forsterite
Experiments
The protosolar disk
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