10028-16-7Relevant articles and documents
Chemistry of mixed crystals in complex phase diagrams the system Bi2O3/Bi2Se3/Bi2Te 3
Schmidt,Oppermann
, p. 627 - 637 (2000)
The phase diagram of the pseudoternary system Bi2O3/Bi2Se3/Bi2Te 3 is found to include a quaternary solid solution Bi2O2(TexSe1-x) and ternary, intermetallic mixed crystals Bi2(TexSe1-x)3. Using thermodynamic modeling of the solid solutions it is possible to calculate complex heterogeneous equilibria between all phases of this phase diagram. As a result we can thermodynamically describe the observed phase relations: Bi2(Tex-Se1-x)3 ΔH°m(298) = 0; ΔS°m(298) = R [xlnx + (1-x)ln(1-x)] Bi2O2(TexSe1-x) ΔH°m(298) = Q ·(1-x); OΔS°m(298) = R/4 [xlnx + (1-x)ln(1-x)] Ω = 0,6 kcal/mol.
Absorption Spectra of Tellurium Clusters in Solid Argon
Hassanzadeh, Parviz,Thompson, Craig,Andrews, Lester
, p. 8246 - 8249 (1992)
Tellurium clusters (Te2, Te3, and two structural isomers of Te4) have been prepared by passing tellurium vapor through an argon microwave discharge and condensing the effluent onto a 12 +/- 2 K cold sapphire window.The Te2 diatomic and two isomers of Te4 have also been prepared by passing tellurium vapor through a superheater (800 deg C) followed by condensing with excess argon at 12 +/- 2 K.Absorption bands at 400 and 440 nm were identified as Te2; and the forbidden X2 3Σ-g ground state of Te2 was observed in the infrared spectrum at 1984.3 cm-1.A structured absorption band centered at 665 nm is assigned to Te3, which is in agreement with the resonance Raman excitation profile.Two absorption bands in the near-infrared region (an unstructured band at 760 nm and a structured band centered at 960 nm) were interconverted upon selective photolysis with band-pass filters.These two bands are assigned to structural isomers of Te4 similar to those observed for S4 and Se4.New infrared bands at 243, 232, 224 cm-1 are assigned to the 760-, 665-, and 960-nm absorbing species, respectively, on the basis of their similar photolysis and annealing behaviors.