Mössbauer study and magnetic measurement of troilite extract from natan iron meteorite

We focused on the troilite in-field Mössbauer spectrum at 5 K in order to confirm or rule out the interpretation of two sextets for other troilite system extracted from the Natan IIICD iron meteorite. Beside the Mössbauer spectroscopy investigation, the global magnetic response of troilite extract was measured. Detailed analysis of field-cooled (FC) induced magnetization (10 mT) showed a similar profile to daubreelite (FeCr2S4) at temperatures below ∼170 K. Induced-FC, temperature dependence of remanent magnetization, and room temperature saturation isothermal remanent magnetization (RT SIRM) magnetization do not show any significant change at low temperatures (∼70 K) related to prior magnetic studies for troilite. In order to quantify a magnetic response of the troilite extract from the Nantan IIICD iron meteorite, the hysteresis loops at 5 and 300 K were measured in external magnetic fields up to 7 T. Hysteresis parameters of coercive field (BC) and saturation magnetization (MS) were found to be 56 mT and 2 Am2/kg at 5 K, respectively. At room temperature, the values of these parameters are lower (BC ∼ 14 mT and MS ∼ 1.44 Am2/kg).