Minimum measured temperature at which np-Fe^(0) forms in ilmenite of lunar soil:Evidence from in-situ TEM heating experimentsOA
Nanophase iron particles(np-Fe^(0))have multiple formation mechanisms in lunar soil,which are mostly related to meteorite and micro meteorite impacts.Thermal modification of the impact is critical.Metal oxides have unique chemical and physical properties that allow np-Fe^(0) to form at a lower initial reaction temperature.Through the insitu heating experiment of ilmenite in the Chang''e-5 sample,it was found that ilmenite can form np-Fe^(0) at 400℃under high vacuum(10-6 Pa).This fills in the missing information on the lowest measured temperature at which ilmenite forms np-Fe^(0).At 400-800℃,only np-Fe^(0) and vesicles were formed without new Ti-rich minerals.At the same time,thermodynamic calculations showed that decomposition of ilmenite occurs in two stages.The experiments correspond to the initial stage of ilmenite thermal decomposition under high vacuum.The study explains the thermal decomposition reaction of ilmenite in a vacuum environment,provides a reference for the minimum measured temperature required for the formation of np-Fe^(0),and further improves the formation mechanism of np-Fe^(0).
Ziyan Qin;Yang Li;Chen Li;Ronghua Pang;Yuanyun Wen;Rui Li;Zixuan Han;Wenhui Ma;Xiongyao Li;Jianzhong Liu
Center for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,China University of Chinese Academy of Sciences,Beijing,ChinaCenter for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,ChinaCenter for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,China Yunnan University,Kunming,ChinaCenter for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,ChinaCenter for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,ChinaCenter for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,ChinaCenter for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,ChinaYunnan University,Kunming,ChinaCenter for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,ChinaCenter for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,China
天文与地球科学
Space weatheringChang’e-5 lunar soilIlmeniteVacuum thermal decomposition
《Acta Geochimica》 2026 (1)
P.55-64,10
funding support from the National Natural Science Foundation of China(Grant Nos.42441804,42403043,42273042,42303041,and U24A2008)Youth Innovation Promotion Association CAS awards"From 0 to 1"Original Exploration Cultivation Project,Institute of Geochemistry,Chinese Academy of Sciences(Grant No.DHSZZ2023.3)Bureau of Frontier Sciences and Basic Research,CAS,(Grant No.QYJ-2025-0103)Guizhou Provincial Foundation for Excellent Scholars Program(Grant No.GCC[2023]088)Provincial Key Research and Development(R&D)Plan Projects of Heilongjiang(Grant No.2024ZXDXB52)The Innovation and Development Fund of Science and Technology of Institute of Geochemistry,Chinese Academy of SciencesGuizhou Province Basic Research Program Project(QKHJC-ZK[2023]-General 473)。
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