Preparation and transport properties of new ternary tellurides AxNb6Te8 (A = Tl, Ca, Sr, Ba, La, and Nd)

Jong Gyu Lee, Simon Chan, K. V. Ramanujachary, Martha Greenblatt

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8 Scopus citations

Abstract

New ternary niobium tellurides AxNb6Te8 (A = Ca, Sr, Ba, La, and Nd; x = 0.22-0.32) have been prepared by molten salt ion exchange reactions of TlxNb6Te8 with rare earth/alkaline earth iodides AI3/AI2 at relatively low temperatures, 535-795°C. Most of the niobium tellurides show metallic behavior followed by superconductivity at low temperatures, 4-6 K. Polycrystalline La0.32Nb6Te8 and Nd0.24Nb6Te8 show a resistivity anomaly at 46 and 43 K, respectively, while polycrystalline Tl0.91Nb6Te8 shows a broad resistivity anomaly at 160-220 K. The resistivity anomaly observed in Tl0.91Nb6Te8 appears to be accompanied by a minor structural distortion evidenced in differential scanning calorimetry. The resistivity anomalies observed in La0.32Nb6Te8 and Nd0.24Nb6Te8 are similar to those observed at ∼40 K for Nb3Te4 and may be related to the onset of a charge density wave type instability.

Original languageEnglish (US)
Pages (from-to)332-338
Number of pages7
JournalJournal of Solid State Chemistry
Volume121
Issue number2
DOIs
StatePublished - Feb 1 1996

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Ceramics and Composites
  • Materials Chemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

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