Synthesis and characterization of quaternary chalcogenides InSn2Bi3Se8 and In0.2Sn6Bi1.8Se9

Experimental and theoretical studies of Sn3−δPbδBi2Se6 (δ=0.0–0.7)

“…Its coordination geometry can be described as a monocapped trigonal prism with M5-Se distances varying between 2.861(2) and 3.459(1)Å. The M-Se distances in both structures are comparable to those in a binary system and some multinary selenides in the literature that contain mixed occupancies of Bi/Sn or Pb/Sn, such as Pb 4 Sb 4 Se 10 [40], Pb 0.875 Sn 0.125 Se [41], PbBi 2 Se 4 [42], InSn 2 Bi 3 Se 8 [28], and Sn 2 Pb 5 Bi 4 Se 13 [30].…”

“…The structure contains two slabs of the same thickness that exhibit NaCl (311) tilt planes expanding along the a, b direction, which are connected by a Se6 atom to form a three-dimensional structure. The same structural feature exists in KSn 5 Bi 5 Se 13 [25] and InSn 6 BiSe 9 [28], which contain similar NaCl(311)-type layer units. The lillianite phase Pb 3 Bi 2 S 6 also contains a metal site on the cell-twinning plane showing mirror symmetry.…”

“…Most of the above lillianite and Pavonite type chalcogenides are sulfosalts; only a few selenides have been reported. Recently, we have demonstrated that multinary selenides, such as InSn 2 Bi 3 Se 8 [28], In 0.63 Sn 5.57 Bi 1.8 Se 9 [28], Pb 4 In x M 6 À x Se 13 [29] (M =Bi, x = 2.1-2.8; Sb, x= 2), Sn 2 Pb 5 Bi 4 Se 13 , and Sn 8.65 Pb 0.35 Bi 4 Se 15 [30], can be prepared through solid-state synthetic routes that comprise various building units. Theoretical calculations have shown that the mixed occupancy metal sites arise from optimized M-Se bonding [29].…”

Lillianites and andorites: new life for the oldest homologous series of sulfosalts

“…A common denominator of all these HRTEM observations is that, with the exception of fully ordered specimens, the chemical composition of the observed domains, faults and other variations could only be deduced and could not be proven. One of the few compositionally more complex synthetic lillianite homologues with a higher N value (N = 7) is In 0.2 Sn 6 Bi 1.8 Se 9 (Wang et al, 2009), space group Cmc2 1 , a = 4.18, b = 13.80, c = 31.95 Å , Z = 4. Divalent Sn is concentrated in the central portions of heyrovský ite-like slabs.…”

Compositional dependence of optical parameters in Se–Bi–Te–Ag thin films

“…Due to their potential device applications in optoelectronics, biology and optics like optical memories, micro lenses, waveguides, gratings, photo doping [18][19][20] etc., Ag containing chalcogenide glasses have received adequate attention in glass science and technology. Multinary chalcogenides containing heavy main-group elements are attractive because of their abundant structural features [21] and distinctive physical properties that are applicable in thermoelectric devices. However, the present work seeks to study the effect of metal impurities on the optical properties of Se-Te based quaternary amorphous thin films.…”