On the system Bi2O3/Bi2Se3/BiCl3, I. The phase diagram Bi2O3/Bi2Se3/BiCl3

Article abstract of DOI:10.1515/znb-2000-0708

The phase relations in the quaternary system Bi/Se/O/Cl have been studied and the existence of several new compounds in the pseudoternary area Bi₂O₃/Bi₂Se₃/BiCl₃ has been established by solid state and chemical vapour transport reactions. The phase diagram is derived from X-ray powder diffraction and thermal analysisdata, and from measurements of the decomposition pressure behaviour. Three new quaternary phases with different compositions exist in the system: Bi₄O₄SeCl₂, Bi₁₀O₁₂SeCl₄ and Bi₂₂O₂₈SeCl₈. By estimation of the thermodynamic data of the quaternary phases it is possible to calculate complex heterogeneous chemical equilibria between all the binary, ternary and quaternary compounds of the phase diagram. As a result, we can describe thermodynamically the observed phase relations and the direction of thermal decomposition of the respective compounds.