A comparative study of troilite in bulk ordinary chondrites Farmington L5, Tsarev L5 and Chelyabinsk LL5 using Mossbauer spectroscopy with a high velocity resolution

作者：Maksimova A A; Oshtrakh M I^*; Klencsar Z; Petrova E V; Grokhovsky V I; Kuzmann E; Homonnay Z; Semionkin V A

来源：Journal of Molecular Structure, 2014, 1073: 196-201.

DOI：10.1016/j.molstruc.2014.05.049

• Troilite
• Ordinary chondrites Farmington L5
• Tsarev L5 and Chelyabinsk LL5
• Mossbauer spectroscopy
• Full static Hamiltonian

A comparative study of troilite in bulk ordinary chondrites Farmington L5, Tsarev L5 and Chelyabinsk LL5 was carried out using Mossbauer spectroscopy with a high velocity resolution and two different fitting programs: in the first case the quadrupole interaction was treated as a perturbation to the first order on the nuclear Zeeman levels, whereas in the other case the full static Hamiltonian of the hyperfine interaction (magnetic + quadrupole) was taken into account for the excited and ground nuclear states. The first fit of the Mossbauer spectra revealed a difference between the hyperfine magnetic field values as found for troilite in Farmington L5 (307.7 +/- 0.2 kOe) and in both Tsarev L5 (311.3 +/- 0.3 kOe) and Chelyabinsk LL5 (311.9 +/- 0.5 kOe), although the spectral component of troilite could not be fitted satisfactorily. In contrast, the second fit resulted in a more accurate description of the troilite spectral component, and revealed a difference in the electric field gradient values found for troilite in Farmington L5 (-4.85 +/- 0.03 x 10(21) V/m(2)) and in both Tsarev L5 (-4.68 +/- 0.05 x 10(21) V/m(2)) and Chelyabinsk LL5 (-4.66 +/- 0.04 x 10 V/m(2)), while the difference between the hyperfine magnetic field values was less pronounced.

• 出版日期2014-9-5