7790-44-5Relevant articles and documents
Phase diagram of the Sb-Se-I system and thermodynamic properties of SbSeI
Aliev,Musaeva,Babanly,Shevelkov,Babanly
, p. 450 - 455 (2010)
The Sb-Se-I system was investigated by using the DTA and XRD analyses and EMF measurements with an antimony electrode. The T-x diagram of the binary Sb-I system was accurately redefined. A number of polythermal sections and the projection of the liquidus surface were constructed. The fields of the primary crystallization, as well as the types and coordinates of non- and monovariant equilibria were determined. It is shown that the quasi-binary sections Sb 2Se3-SbI3, Sb-SbSeI, SbI3-Se, and SbSeI-Se triangulate the Sb-Se-I system, leading to five independent subsystems. A broad area of immiscibility, that overlaps a certain part of the antimony primary crystallization field, was found. From the EMF measurements, the partial molar functions of antimony (ΔG?,ΔH?,ΔS?) as well as standard integral thermodynamic functions of SbSeI were calculated. The latter were found to have the following values: ΔGf,2980=-80.121.81kJ/mol; ΔHf,2980=-77.31.8kJ/mol; S2980=155.29.5J/(molK).
Direct Gap Semiconductors Pb2BiS2I3, Sn2BiS2I3, and Sn2BiSI5
Islam, Saiful M.,Malliakas, Christos D.,Sarma, Debajit,Maloney, David C.,Stoumpos, Constantinos C.,Kontsevoi, Oleg Y.,Freeman, Arthur J.,Kanatzidis, Mercouri G.
, p. 7332 - 7343 (2016)
New quaternary thioiodides Pb2BiS2I3, Sn2BiS2I3, and Sn2BiSI5 have been synthesized by isothermal heating as well as chemical vapor transport. Pb2BiS2I3 and Sn2BiS2I3 crystallize in the space group, Cmcm, with unit cell parameters a = 4.3214 (9), b = 14.258 (3), and c = 16.488 (3) ? a = 4.2890 (6), b = 14.121(2), and c = 16.414 (3) ?, respectively. Sn2BiSI5 adopts a unique crystal structure that crystallizes in C2/m with cell parameters a = 14.175 (3), b = 4.3985 (9), c = 21.625 (4) ?, and β = 98.90(3)°. The crystal structures of Pb2BiS2I3 and Sn2BiS2I3 are strongly anisotropic and can be described as three-dimensional networks that are composed of parallel infinite ribbons of [M4S2I4] (M = Pb, Sn, Bi) running along the crystallographic c-axis. The crystal structure of Sn2BiSI5 is a homologue of the M2BiS2I3 (M = Pb, Sn) which has two successive ribbons of [M4S2I4] separated by two interstitial (Sn1-xBixI6) octahedral units. These compounds were characterized by scanning electron microscopy, differential thermal analysis, and X-ray photoelectron spectroscopy. Pb2SbS2I3, Pb2BiS2I3, Pb2Sb1-xBixS2I3 (x ～ 0.4), Sn2BiS2I3 and Sn2BiSI5 are highly resistive and exhibit electrical resistivities of 3.0 G cm, 100 M cm, 65 M cm, 1.2 M cm, and 34 M cm, respectively, at room temperature. Pb2BiS2I3, Sn2BiS2I3, Pb2SbS2I3, Pb2Sb1-xBixS2I3 (x ～ 0.4), and Sn2BiSI5 are semiconductors with bandgaps of 1.60, 1.22, 1.92, 1.66, and 1.32 eV, respectively. The electronic band structures of Pb2BiS2I3, Sn2BiS2I3, and Sn2BiSI5, calculated using density functional theory, show that all compounds are direct bandgap semiconductors.
A new preparative approach to HgPbP14 structure type materials: Crystal structure of Cu0.73(1)Sn1.27(1)P14 and characterization of M1-xSn1+xP14 (M = Cu, Ag) and AgSbP14
Lange, Stefan,Sebastian, C. Peter,Nilges, Tom
, p. 195 - 203 (2006)
A new preparative approach, using main group iodides as mineralization agents, was developed to prepare bulk quantities of HgPbP14 [(M1)(M2)P14] type polyphosphides containing group 11 cations on the M1 and main group elements Sn or formerly unseen Sb on the M2 position. The known (M1)2+:(M2)2+ combination of cations is extended with the combination (M1)1+:(M2)3+ in AgSbP14. A single crystal structure determination was performed for Cu 1-xSn1+xP14. Cu0.73(1)Sn 1.27(1)P14 crystallizes orthorhombically, space group Pnma (No. 62) with lattice constants a = 12.513(2) A, b = 9.800(1) A, c = 10.445(1) A, V = 1280.8(3) A3 and Z = 4. Small differences in the cell parameters between the single crystal and powder diffraction experiments of CuSnP14 are probably due to a small homogeneity range. Tetravalent tin postulated beside divalent tin for isostructural Au0.64Sn1.36P14 could not be detected by 119Sn-Moessbauer spectroscopic experiments for the copper tin polyphosphide. An ionic description like [(M1+) 1-x(M24+)]2+ [(M22+)(P 0)10(P1-)4]2- with x = 0.33 according to a Zintl-Klemm concept has to be substituted by a more covalent description of [(M1+)1-x(M22+) x](1+x)+- [(M22+)(P14)] (1+x)- for the copper tin polyphosphide.
