Abstract
The phase diagram of the pseudobinary system (Bi2Te3)–(BiI3) has been determined by the methods of differential thermal analysis, X-ray diffraction, X-ray microanalysis and optical microscopy. It was found that there existed a single phase compound around the non-stoichiometric composition Bi1.00Te0.98I1.02 which had the melting point of 560°C. The range of the single phase composition seemed to be from Bi0.99Te0.94I1.07 to Bi1.00Te0.99I1.01 BiTeI has a phase transition which occurs at about 470°C and the crystal structure in the low temperature phase is hexagonal; a=4.346 Å, c=6.835 Å. The atomic distances of Bi–Te, Te–I and I–Bi are 3.826 Å, 3.235 Å and 5.532 Å, respectively. If the difference between the atoms Te and I is ignored, the structure of the compound may be similar to that of CdI2. The compound is revealed to be semi-metallic in nature by measuring its electrical resistivity and Hall coefficient.
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