Affordable Access

Publisher Website

Charge transfer band observed in bismuth mixed-valence oxides, Bi1− xYxO1.5+δ(x= 0.3)

Solid State Communications
Publication Date
DOI: 10.1016/s0038-1098(97)00405-5


Abstract The polycrystalline thin film of Bi 1− x Y x O 1.5 ( x = 0.3) has been prepared by r.f.-sputtering method and was annealed under various oxidation conditions for the introduction of excess oxygens. In Bi 0.7Y 0.3O 1.5+δ, as the preparation condition became oxidative, the band gap decreased from 3.0 to 2.1 eV, indicating the formation of Bi 5+. In pseudo-perovskite crystal, BaBiO 3 thin film which was prepared for comparison, the intense and broad absorption band with the absorption coefficient of 10 5 cm −1 located at 2.2 eV was observed. The absorption bands observed in both oxides were ascribed to the charge transfer transitions from Bi 3+ 6 s 2 to Bi 5+ 6 s 0. However, they had different intensities and energy positions. These transitions were classified into two types from the point of view of lattice vibration of anions between mixed-valence cations. In perovskite type in which ( BiO 6 2 ) octahedra are linked by sharing corner, the vibration of apical oxygens was expected to enhance the charge transfer transition.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times

More articles like this

Valence states of bismuth in new mixed-valence oxi...

on Materials Research Bulletin Jan 01, 1999

Magnetism of mixed bismuth–boron oxides.209 BiNQR...

on Physica B Condensed Matter Jan 01, 2002

Theb1Σ+(b0+) → X3Σ−(X10+,X21) anda1Δ(a2) → X21 tra...

on Journal of Molecular Spectrosc... Jan 01, 2006

Theb1Σ+(b0+) →X3Σ−(X10+,X21) anda1Δ(a2) →X21 Trans...

on Journal of Molecular Spectrosc... Jan 01, 1999
More articles like this..