ChemInform Abstract: Compositionally Controlled Metal—Insulator Transition in Tl2-xInxTeO6.

✍ Scribed by Theeranun Siritanon; A. W. Sleight; M. A. Subramanian

• Publisher: John Wiley and Sons
• Year: 2011
• Weight: 22 KB
• Volume: 42
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.201129004

✦ Synopsis

Compositionally Controlled Metal-Insulator Transition in Tl 2-x In x TeO 6 . -Polycrystalline samples of the complete solid solution series Tl2-xInxTeO6 (0 ≤ x ≤ 2) are prepared by solid state reaction of stoichiometric mixtures of In2O3, Tl2O3, and TeO2 or H6TeO6 (gold containers, 550-650 °C, 24 h). The compounds are characterized by powder XRD, electrical resistivity, and Seebeck coefficient measurements. All the compounds crystallize with the Na 2 SiF 6 -type structure in the trigonal space group P321. Tl2TeO6 exhibits metallic behavior, whereas In2TeO6 is an insulator. The metal-insulator transition occurs at an x value of about 1.4, which is rationalized by a percolation model. No superconductivity is detected down to 5 K. -(SIRITANON, T.;