Abstract
The phase equilibria in the composition region Tl2Te-Tl2Te3-Nd2Te3-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 Tl9NdTe6, Tl4NdTe3, Tl6Nd4Te9, Tl4Nd6Te11, Tl2NdTe3, TlNdTe3, and TlNd3Te6. X-ray powder diffraction data indicate that the compounds Tl9NdTe6 and Tl4NdTe3 are structural analogs of Tl5Te3 and have tetragonal cell parameters a = 8.855 A, c = 13.010 A and a = 8.858 A, c = 12.998 A, respectively (sp. gr. I4/mcm, Z = 4). Tl9NdTe6 and Tl4NdTe3 are phases of variable composition (δ-phase), and their fields cover most of the Tl2Te-Tl5Te3-Tl4NdTe3 composition triangle. The structure of Tl5Te3 and its ternary analogs is discussed, and the conclusion is drawn that, in spite of the broad field of the δ-phase, Tl9NdTe6 and Tl4NdTe3 are daltonides, i.e., distinct chemical compounds.
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