Mossbauer Investigation of the Chelyabinsk Meteorite Fragment

摘要

The article devoted to study of the fragments of Chelyabinsk meteorite with the help of Mossbauer spectroscopy. It is shown that the iron in various fragments of the meteorite exist in different crystallographic, physical and chemical conditions. A new phenomenon of sharp increasing effective magnetic field in the region of the iron nuclei in the temperature range of 553-573 K and jumps of the main parameters of Mossbauer spectra at other temperatures are observed. According to the data of the isomer shifts and quadruple splitting of the individual spectra, iron ions have a valence of Fe~(2+)- 3d~6, Fe~(3+)- 3d~5, Fe~(4+)- 3d~4, Fe~(6+) - 3d~2 and also intermediate between them. A qualitative explanation of the experimental data is proposed.