Oxygen vacancies and pseudo Jahn‐Teller destabilization in cesium‐doped hexagonal tungsten bronzes

• DOI: 10.1111/jace.16414
• Publication Date: 2019-03-05T06:01:38Z
• Authors: Mika Okada; Katsushi Ono; Satoshi Yoshio; Hideaki Fukuyama; Kenji Adachi
• Keywords: Jahn–Teller effect

Abstract Structural and compositional changes of Cs‐doped hexagonal tungsten bronzes ( HTB ) with respect to variations in oxygen deficiency alkali content have been investigated detail through x‐ray diffraction Rietveld analysis, photoelectron spectroscopy, Raman spectroscopy. Cs‐ crystallized a reductive atmosphere is evidenced generally contain plenty defects, general formula, Cs x WO 3− y (0.20 ≤ 0.32, 0 < 0.46), proposed. Lattice parameters are observed vary according the relation, c (Å) = −3.436 + 33.062. The coordinated modification W–O octahedral dimensions suggests origin structural change increasing be destabilization pseudo Jahn‐Teller distortion due donated electrons. dimensional lattice electrons emitted from defects appraised only 1/18 as that doped ions, suggesting most should localized .