Structural, electrical and optical properties of lanthanum-doped barium stannate

Ba1−xLaxSnO3 compounds were prepared by a conventional solid-state reaction method and their structural, electrical and optical properties were analyzed in this work. X-ray diffraction investigations revealed that La substitution in BaSnO3 led to the increase of cubic lattice parameters, whereas sec...

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Bibliographic Details
Published in:Ceramics international 2015-03, Vol.41 (2), p.2668-2672
Main Authors: Luo, B.C., Zhang, J., Wang, J., Ran, P.X.
Format: Article
Language:English
Subjects:
Band spectra
Barium stannate
C. Electrical properties
C. Optical properties
Ceramics
Electrical resistivity
Energy use
Lattice vacancies
Optical properties
Semiconductors
Transparent conductive oxides
X-ray photoelectron spectroscopy
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Summary:Ba1−xLaxSnO3 compounds were prepared by a conventional solid-state reaction method and their structural, electrical and optical properties were analyzed in this work. X-ray diffraction investigations revealed that La substitution in BaSnO3 led to the increase of cubic lattice parameters, whereas secondary phase appeared at x=0.1 or above. Evidences of the Sn4+ state and oxygen vacancies were clearly observed in X-ray photoelectron spectroscopy. The semiconductor behavior in temperature-dependent resistivity was found to obey the variable-range hopping conduction mechanism. With the help of absorption spectra, smaller band-gap energy and larger Urbach tail energy were observed in Ba0.93La0.07SnO3, as compared with Ba0.97La0.03SnO3, which was discussed in the frame of the role of structural disorder.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2014.10.080