Structure Of Sn0 Research Articles

Structural disordering in Sn-Pb(Bi) eutectic melts induced by heating

Abstract The structure of liquid Sn0.739Pb0.261 and Sn0.57Bi0.43 eutectic alloys was studied by means of X-ray diffraction at several temperatures. Structure factors, pair correlation functions and the main structural parameters obtained on their basis were analyzed. We show that the structure of the Sn0.739Pb0.261 and Sn0.57Bi0.43 eutectic alloys is inhomogeneous and consists of different types of clusters. Upon heating the cluster structure undergoes topological and chemical disordering showing a significant dependence of structural parameters on temperature near the melting point

Quantum-chemical modeling of the electronic structure and chemical bond of Sn0.875M0.125O2 (M = Cr, Mn, Co)

The electronic structure of the Sn0.875M0.125O2 compounds (M = Cr, Mn, Co) with a rutile structure and magnetic moments of the transition metal atoms in them were calculated by the ab initio spin-polarized linear muffin-tin orbital method. The electron density and electron localization function maps for these compounds were constructed. Based on these data, the effect of the composition of these phases on the electronic spectrum, chemical bond, and magnetic and transport properties were analyzed.

X-ray powder diffraction study of Sn0.59Ti0.41Te3O8

The crystal structure of titanium-tin tellurium oxide Sn0.59Ti0.41Te3O8 has been determined using X-ray powder diffraction techniques. At room temperature, the title compound crystallizes in cubic space group Ia-3, with lattice parameter a=11.05515(6) Å. Rietveld refinement of the structure led to final confidence factors Rp=0.0395 and Rwp=0.0577. The structure of Sn0.59Ti0.41Te3O8 consists of isolated Ti/SnO6-octahedra slightly deformed in the a direction. The TeO4E [E=lone pair of Te(IV) atoms] groups are located between the octahedra ensuring the stability of the structure by Ti/Sn-O-Te bonding contacts. Only one peak in thermal behavior was detected for this compound at 488 K by differential scanning calorimetry experiment. An IR spectroscopic study is employed as a means to obtain preliminary structural information and shows the presence of the Ti/SnO6 and TeO4E groups. This result is later confirmed by X-ray diffraction studies.

Strukturchemie und Valenz von In6S7: Neubestimmung der Kristallstruktur

Abstract The known crystal structures of the mixed valence compounds In6S7 and Sn0.5In5S7 are characterized by the existence of indium atoms in different valence states: In+-ions (Sn2+), dumbbell shaped In2 4+ groups and In3+-ions. The In2 4+ and In3+ species are embedded in a characteristic coordination of sulfur atoms found separately in comparable simpler non-mixed-valence chalcogenides of indium. In6S7 however is so far the only example with monovalent indium in a surrounding of sulfur. The question whether P21 or P21/m is the correct space group for the description of In6S7 (or Sn0.5In5S7) cannot be answered clearly on the basis of the existing experimental data because it only affects a small possible deviation of the “lone pair cation” In+ (Sn2+) from a mirror plane. This may however be of great importance for futural studies of the physical properties. We prove the crystal structure of Sn0.5In5S7 and In6S7 to be actually isotypic. Moreover we show, that the pure tin containing compound does not exist, but is indeed In6S7 in which In+-ions are partly (max. 50%) substituted by Sn2+.

Structure of Sn0.854Mo6S8

Structure of Sn0.854Mo6S8