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 language | English |
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Pages (from-to) | 5770-5773 |
Number of pages | 4 |
Journal | Angewandte Chemie - International Edition |
Volume | 56 |
Issue number | 21 |
DOIs | |
Publication status | Published - 2017 May 15 |
Externally published | Yes |
Keywords
- high-pressure synthesis
- perovskites
- superconductivity
- tetragonal tungsten bronze
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)