High-Pressure Synthesis of Fully Occupied Tetragonal and Cubic Tungsten Bronze Oxides

Yuya Ikeuchi, Hiroshi Takatsu, Cédric Tassel, Yoshihiro Goto, Taito Murakami, Hiroshi Kageyama

Research output: Contribution to journalArticlepeer-review

Abstract

A high-pressure reaction yielded the fully occupied tetragonal tungsten bronze K3W5O15 (K0.6WO3). The terminal phase shows an unusual transport property featuring slightly negative temperature-dependence in resistivity (dρ/dT<0) and a large Wilson ratio of RW=3.2. Such anomalous metallic behavior possibly arises from the low-dimensional electronic structure with a van Hove singularity at the Fermi level and/or from enhanced magnetic fluctuations by geometrical frustration of the tungsten sublattice. The asymmetric nature of the tetragonal tungsten bronze KxWO3-K0.6−yBayWO3 phase diagram implies that superconductivity for x≤0.45 originates from the lattice instability because of potassium deficiency. A cubic perovskite KWO3 phase was also identified as a line phase—in marked contrast to NaxWO3 and LixWO3 with varying quantities of x (<1). This study presents a versatile method by which the solubility limit of tungsten bronze oxides can be extended.

Original languageEnglish
Pages (from-to)5770-5773
Number of pages4
JournalAngewandte Chemie - International Edition
Volume56
Issue number21
DOIs
Publication statusPublished - 2017 May 15
Externally publishedYes

Keywords

  • high-pressure synthesis
  • perovskites
  • superconductivity
  • tetragonal tungsten bronze

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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