57Fe Mössbauer absorption study in berthierite (FeSb2S4)

Polaronic transport and thermoelectricity in Fe1−xCoxSb2S4 ( Liu1, Kang2, Stavitski3 et al. 2018Phys. Rev. B70301View full textAdd to dashboardCite

“…9 Mössbauer spectra and theoretical calculations for FeSb 2 S 4 and MnSb 2 S 4 suggest that Fe 2+ and Mn 2+ are in the high spin state. 9,18 This is in agreement with r F e 2+ (0.78Å) < r Mn 2+ (0.83Å) for the high spin state with sixfold coordination. Figure 2 .…”

“…39 Whereas FeSb 2 S 4 Mössbauer experiment suggests a helicoidal-type AFM ground state with Fe 2+ moments parallel to the ab plane and with a noncommensurate propagation vector along the c axis, neutron diffraction studies are necessary to shed more details on the two-step transition. 18,40 The hysteresis loops measured at T = 2 K show a weak FM component at low fields, which might be caused by spin canting and/or magneto-crystalline anisotropy, as shown in Fig. 4(d).…”

“…The ternary MPn 2 Q 4 (M = Mn, Fe; Pn = Sb, Bi; Q = S, Se) compounds are typically magnetic semiconductors that exhibit high thermopower and rather tunable electronic, magnetic, and thermoelectric properties. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] For instance, antiferromagnetic (AFM) ordering can be observed in FeSb 2 S 4 , [16][17][18][19] MnSb 2 S 4 , 7-10 MnSb 2 Se 4 , [11][12][13] and MnBi 2 Se 4 , 14,15 whereas FeSb 2 Se 4 and FeBi 2 Se 4 exhibit ferromagnetic (FM) behavior. 20,21 Moreover, p-type semiconducting behavior is observed in MnSb 2 Se 4 and FeSb 2 Se 4 with a semiconductor-to-insulator transition for FeSb 2 Se 4 below 130 K, [11][12][13]20 but MnBi 2 Se 4 and FeBi 2 Se 4 are n-type semiconductors.…”

“…14,15,21 Among these compounds, FeSb 2 S 4 shows a helicoidaltype AFM order below T N = 50 K with Fe 2+ moments parallel to the ab plane and a non-commensurate propagation vector along the c axis. 18 The unit cell contains four FeSb 2 S 4 , in which Fe atoms are surrounded by six S atoms in a distorted octahedral arrangement. The FeS 6 octahedra share edges to form chains parallel to the b axis [Fig.…”

“…[22][23][24] The chains are connected together via S-Sb-S bonds with some rather short Sb-S distances (2.43 Å and 2.48 Å) suggesting strong covalence of these bonds, whereas the large Fe-S distances (2.45 ∼ 2.62 Å) indicate that the Fe-S bond is rather ionic and that Fe is in the 3d 6 high spin Fe 2+ state. 16,18 Furthermore, FeSb 2 S 4 features a lone Sb 3+ pair which could increase anharmonicity of bonds and enhance phonon-phonon scattering. 19 In contrast to literature devoted to MnPn 2 Q 4 or FeSb 2 Se 4 , there are no studies of FeSb 2 S 4 thermoelectric and/or physical properties tuning yet.…”