Magnetic susceptibility and Mössbauer effect measurements in FeIn2S4

Structural and Local Environment Modifications in a Chemically Lithiated Iron Thiospinel

“…Such a distortion is frequently observed in spinels and is due to the fact that most of the cations are too large to be accommodated on tetrahedral sites, so that they originate some displacement of the anions, distorting at the same time the octahedral sites. This distortion splits the t orbitals into a singlet and a doublet, creating an asymmetric charge distribution, and giving the main contribution to the observed quadrupole splitting (14). Additional distortions caused by tetrahedral vacancies may slightly increase or decrease this splitting but its order of magnitude does not change.…”

“…The influence of vacancies on the Mo¨ssbauer spectrum of octahedrally coordinated Fe atoms is less evident. The main contribution to the quadrupole splitting of about 3.2 mm/s in the case of these compounds comes from a trigonal distortion of the sulfur octahedron (14). Such a distortion is frequently observed in spinels and is due to the fact that most of the cations are too large to be accommodated on tetrahedral sites, so that they originate some displacement of the anions, distorting at the same time the octahedral sites.…”

Magnetic and Mössbauer Study of the Novel FeIn2S2Se2 Layered Compound

“…From the fit of w dc in the T4100 K range (inset of Fig. 4), we obtained Y=À126(3) K for the Weiss temperature and m eff =4.54(3) m B for the effective magnetic moment, similar to those previously reported for FeIn 2 S 4 (14). This similarity between Curie-Weiss parameters in FeIn 2 S 2 Se 2 and FeIn 2 S 4 (À126(3) K and À122(3) K in Ref.…”

“…This similarity between Curie-Weiss parameters in FeIn 2 S 2 Se 2 and FeIn 2 S 4 (À126(3) K and À122(3) K in Ref. (14), respectively) suggests that the effective superexchange interactions involves mainly Fe-S paths. The m eff value is about 10% smaller than expected for the free ion value (Fe 2+ B4.9 m B ), which might be due to covalence effects.…”

Mössbauer investigation of Fe0.5In1.5S3

“…From magnetic susceptibility measurements a spin-only value for divalent Fe was obtained, which is also confirmed by the isomer shift data [6][7][8][9]. The existence of a quadrupole splitting (eQV zz /2 = 3.23 mm/s at room temperature) in an octahedral environment was taken as an indication for a trigonal distortion, which splits the triplet orbital ground state of Fe 2+ in a doublet and a singlet [6,9].…”