Mössbauer spectroscopy with a high velocity resolution applied for the study of meteoritic iron-bearing minerals

Abstract

a b s t r a c tMössbauer spectroscopy with a high velocity resolution was applied for study of iron-bearing minerals in different meteorites. The possibility of technique to reveal small variations in Mössbauer hyperfine parameters of the 57 Fe in the non-equivalent M1 and M2 sites in olivines from Farmington L5 and Tsarev L5 ordinary chondrites and from Omolon and Seymchan pallasites was demonstrated. The necessity of accounting for the Fe and Ni occupation probabilities in the local microenvironments for non-equivalent sites M1, M2 and M3 in schreibersite, an iron nickel phosphide from Sikhote-Alin iron meteorite, in the fit of its Mössbauer spectra was shown. Variations in Mössbauer parameters of metal samples from visually different areas at the saw-cut surface of Chinga iron meteorite fragment with unknown origin were observed; these variations may be related to different metal phase composition and local variations of Ni concentration in the metal phases in these areas.

Applications of Mössbauer Spectroscopy in Meteoritical and Planetary Science, Part I: Undifferentiated Meteorites

“…Another option of precise measurements was developed in the case of so-called Mössbauer spectroscopy with a high velocity resolution, i.e., with a higher discretization of the velocity reference signal (up to 2 12 ) than that in conventional spectrometers (up to 2 9 ) (see [24,25]). This method is not so fast but very precise and sensitive that demonstrates some important advances in the study of meteorites (for review see [26][27][28][29][30]). In the present review, which was divided in two parts: this Part I and the next Part II [31], we will consider the main results of various meteorites and planetary materials investigations by 57 Fe Mössbauer spectroscopy known up to now.…”

Mössbauer parameters of ordinary chondrites influenced by the fit accuracy of the troilite component: an example of Chelyabinsk LL5 meteorite

“…Similar approach was applied in the study of ordinary chondrites in [13,14]. The relative area of troilite component in the Mössbauer spectra of ordinary chondrites may vary in the range of ∼10-20%, and the fit of Mössbauer spectra of ordinary chondrites using PFO for troilite component lead to some errors indicated by differential spectra (see [8][9][10]15]) and possible misfits of other spectral components. Therefore, we fitted the high velocity resolution Mössbauer spectra of three ordinary chondrites using FH applied for the troilite component [16] which significantly improved the fit quality.…”

Study of Dronino Iron Meteorite Weathering in Clay Sand Using Mössbauer Spectroscopy

“…Further, with the development of technique application, the high velocity resolution Mössbauer spectroscopy (high discretization of both the velocity reference signal and the velocity scale in the spectra) demonstrated significant advances in the study of the complicated spectra of various meteorites in order to extract more detailed information. [3][4][5][6][7] Therefore, in the present work we discuss the results of re-examination of the first samples of Dronino oxidation products in comparison with new samples studied with the high velocity resolution Mössbauer spectroscopy.…”