Akademik Məlumat İdarəetmə Sistemi
Inorganic Materials, vol.44, no.9, pp.935-938, 2008 (SCI-Expanded, Scopus)
The phase equilibria in the composition region Tl 2Te-Tl 2Te 3-Nd 2Te 3-NdTe of the Tl-Nd-Te system have been studied by differential thermal analysis and x-ray diffraction, and the 500-K section of its phase diagram has been mapped out. The ternary compounds identified are Tl 9NdTe 6, Tl 4NdTe 3, Tl 6Nd 4Te 9, Tl 4Nd 6Te 11, Tl 2NdTe 3, TlNdTe 3, and TlNd 3Te 6. X-ray powder diffraction data indicate that the compounds Tl 9NdTe 6 and Tl 4NdTe 3 are structural analogs of Tl 5Te 3 and have tetragonal cell parameters a = 8.855 Å, c = 13.010 Å and a = 8.858 Å, c = 12.998 Å, respectively (sp. gr. I4/mcm, Z = 4). Tl 9NdTe 6 and Tl 4NdTe 3 are phases of variable composition (δ-phase), and their fields cover most of the Tl 2Te-Tl 5Te 3-Tl 4NdTe 3 composition triangle. The structure of Tl 5Te 3 and its ternary analogs is discussed, and the conclusion is drawn that, in spite of the broad field of the δ-phase, Tl 9NdTe 6 and Tl 4NdTe 3 are daltonides, i.e., distinct chemical compounds. © 2008 MAIK Nauka.