NDLI: Characterization of the mixed perovskite BaSn1–xSbxO3 by electrolyte electroreflectance, diffuse reflectance, and X-ray photoelectron spectroscopy

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Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 3

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 2

Journal of the Chemical Society, Faraday Transactions 1 Vol -79

Journal of the Chemical Society, Faraday Transactions 1 Vol -69

Characterization of the mixed perovskite BaSn_1–xSb_xO₃ by electrolyte electroreflectance, diffuse reflectance, and X-ray photoelectron spectroscopy

Content Provider	Royal Society of Chemistry (RSC)
Author	Costa, Fernanda M. A. da Larramona, Gerardo Gutiérrez, Claudio Nunes, Manuel Rosa Pereira, Isabel
Copyright Year	1989
Abstract	The band gap of the mixed perovskite BaSn1–xSbxO3 has been reported to be 134 kJ mol–1(J-M. Hermann, M. R. Nunes and F. M. A. da Costa, J. Chem. Soc., Faraday Trans. I, 1982, 78, 1983), corresponding to 1.4 eV, which is the optimum value for solar-energy conversion. In order to confirm this value, pressed discs of the mixed perovskite were sintered at 1673 K and made into electrodes, and their electrolyte electroreflectance (e.e.r.) spectra measured. The band gap was determined by fitting the e.e.r. spectra to Aspnes' formula for the low-field regime. The band gap of the pure, insulating perovskite BaSnO3 was determined from its diffuse reflectance spectrum, after application of the Kubelka–Munk formula. The band gap of the mixed perovskite was constant and equal to 330 kJ mol–1 for Sb concentrations in the range x= 0–10%, in agreement with the observed constancy of the lattice parameter for x= 0–17%, the range over which the perovskite exists as a single phase. The high band-gap energy of this material makes it unsuitable for solar-energy conversion. X-Ray photoelectron spectroscopy measurements showed that all the Sb in the mixed perovskite was present as SbV, as would be expected from the high conductivity of the samples. From the atomic ratios it was concluded that probably the surface of the pure BaSnO3 perovskite is enriched in SnO2, and that of the mixed perovskite in Sb2O5.
Starting Page	907
Ending Page	916
Page Count	10
File Format	PDF
ISSN	03009599
Volume Number	85
Issue Number	4
Journal	Journal of the Chemical Society, Faraday Transactions 1
DOI	10.1039/F19898500907
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	da Costa Munk Antimony pentoxide Lattice constant Faraday Trans Electronvolt Photoemission spectroscopy Chem Perovskite David E. Aspnes Electrolyte Faraday constant Sintering Nunes Hermann Kubelka Band gap
Content Type	Text
Resource Type	Article
Subject	Chemistry

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