An investigation of CoSn using Mössbauer Spectroscopy

Abstract

The compound CoSn has been studied by Mössbauer spectroscopy using the isotopes 57Fe and 119Sn. A considerable resemblance was found between the isomer shift and the electric quadrupole splittings for the transition metal atoms and the tin atmos, and those in the isostructural compounds FeSn and FeGe. A decrease in the 57Fe isomer shifts in the sequence FeSn, CoSn, FeGe can be related to an increase of the conduction electron density.

Effect of annealing on nanostructured Sn30Co30C40 prepared by mechanical attrition

“…The fitted spectral parameters are given in Table 1. In all cases the resulting values are identical (within expected uncertainty) to the literature values from Häggström et al [15]. A small amount of misfit is seen in the result near +3.7 mm/s.…”

“…5. Previous 119 Sn Mössbauer effect measurements of this material [15] as well as an analysis of the Sn site configuration in hexagonal (B35) CoSn indicate that a fit to two quadrupole split doublets is appropriate for the present spectrum. These fitted components are shown in Fig.…”

“…A small amount of misfit is seen in the result near +3.7 mm/s. The analysis of Häggström et al [15] shows this feature as well. This misfit may be accounted for with a small (∼2%) component with a center shift of ∼3.0 mm/s and a splitting of ∼1.2 mm/s.…”

Tuneable anisotropy and magnetism in Sn2Co3S2−xSex– probed by119Sn Mößbauer spectroscopy and DFT studies

“…It is predicted as S = ½ half metal ferromagnetism (HFM) like Sn 2 Co 3 S 2 and hitherto unknown Sn 2 Co 3 Se 2 from DFT calculations (Tab. Like in intermetallics CoSn (2.63 Å), 31 CoSn 2 (2.73 Å), 41 or Co 3 Sn 2 (2.6-2.7 Å) 42 they are estimated weaker than Co-Sn. The calculated net moment of 1 µ B is due to additional electrons (visualized by arrows in Fig.…”

“…Here, the ordering temperature was determined to decrease to 133(1) K for x= 0.9. 31 Parameters marked with asterisks were kept fixed during fitting procedure. In the case of Sn 2 Co 3 S 1.8 Se 0.2 a modified Curie-Weiss law χ = χ 0 + (C / (T-)) was applied where χ 0 accounts for a temperature independent contribution, most likely from a tiny impurity component (SnSe and Co 3 Sn 2 according to X-ray diffraction, see SI).…”