New progress has been made in the study of Chang'e-5 lunar soil: the elemental metal iron causing disproportionation reaction was discovered for the first time.
CTOnews.com, September 3, according to CCTV news, recently, a joint research team of the Institute of Geochemistry of the Chinese Academy of Sciences and Kunming University of Technology carried out in-depth and detailed analysis of the iron olivine particles in lunar soil powder taken from Chang'e 5, and reliable evidence of disproportionation of elemental metal iron was found in the secondary impact crater on the submicron scale. At the same time, the theoretical calculation results show that the formation velocity of the secondary impact crater is lower than that of 3.0km / s.
It is reported that the discovery and confirmation of nanometer elemental metallic iron caused by disproportionation has revolutionized the existing understanding of the formation mechanism of elemental metallic iron in lunar soil for decades. At the same time, because the low-velocity impact exists widely in the solar system, it has extensive reference and reference significance for studying the formation mechanism of elemental metal iron in the surface soil of the moon, especially in the permanent shadow areas of the poles, asteroids and solid celestial bodies in the outer solar system. This result was recently published online in the international academic journal Nature Astronomy.
CTOnews.com learned that on December 17 last year, the Chang'e-5 probe successfully completed the lunar sample sampling mission and brought back lunar samples belonging to the Chinese. During the lunar sample collection mission, the Chang'e-5 probe obtained a total of about 1731 grams of lunar samples by means of meter acquisition and drilling. On July 12 this year, the National Space Administration held the ceremony for the distribution of the first lunar scientific research samples of the Chang'e-5 mission, which marked the official start of the scientific research of lunar samples. The first batch of lunar scientific research samples, with a total of 17.4764 grams, were divided into 31 and distributed to 13 scientific research institutions. It includes 6 X-ray samples (157.6 mg), 13 debris samples (868.8 mg) and powder samples (16.45g).
