Syntheses, crystal structures, and characterization of two new Tl +-Cu2+-Te6+ oxides: Tl4CuTeO 6 and Tl6CuTe2O10

Jeongho Yeon, Sang Hwan Kim, Mark A. Green, Kanwal Preet Bhatti, C. Leighton, P. Shiv Halasyamani

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Abstract

Crystals and polycrystalline powders of two new oxide materials, Tl 4CuTeO6 and Tl6CuTe2O10, have been synthesized by hydrothermal and solid-state methods. The materials were structurally characterized by single-crystal X-ray diffraction. Tl 4CuTeO6 and Tl6CuTe2O10 exhibit one dimensional anionic slabs of [CuTeO6]4∼ and [CuTe 2O10]6∼, respectively. Common to both slabs is the occurrence of Cu2+O4 distorted squares and Te 6+O6 octahedra. The slabs are separated by Tl+ cations. For Tl4CuTeO6, magnetic measurements indicate a maximum at ∼8 K in the temperature dependence of the susceptibility. Low temperature neutron diffraction data confirm no long-range magnetic ordering occurs and the susceptibility was adequately accounted for by fits to a Heisenberg alternating chain model. For Tl6CuTe2O 10 on the other hand, magnetic measurements revealed paramagnetism with no evidence of long-range magnetic ordering. Infrared, UV-vis spectra, thermogravimetric, and differential thermal analyses are also reported. Crystal data: Tl4CuTeO6, Triclinic, space group P-1 (No. 2), a=5.8629(8)A, b=8.7848(11) A, c=9.2572(12)A, α = 66.0460(10), β = 74.2010(10), γ = 79.254(2), V=417.70(9) A 3, andZ=2; Tl 6CuTe2O10, orthorhombic, space group Pnma (No. 62), a=10.8628(6) Å, b=11.4962(7)Å, c=10.7238(6) Å, V= 1339.20(13) Å3, and Z=4.

Original languageEnglish (US)
Pages (from-to)607-613
Number of pages7
JournalJournal of Solid State Chemistry
Volume196
DOIs
StatePublished - Dec 2012

Bibliographical note

Funding Information:
JY, S-HK, and PSH thank the Robert A. Welch Foundation (Grant E-1457) and the Texas Center for Superconductivity for support. JY thanks the International Centre for Diffraction Data for 2011 Ludo Frevel Crystallography Scholarship Award. We acknowledge the support of the National Institute of Standards and Technology, U.S. Department of Commerce, in providing the neutron research facilities used in this work. Work at UMN, specifically the magnetic characterization, was supported by DOE under DE-FG02-06ER46275 .

Keywords

  • Crystal structures
  • Magnetic interactions
  • Oxides
  • Thallium

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