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

• Published in: Ceramics international Vol. 41; no. 2; pp. 2668 - 2672
• Main Authors: Luo, B.C., Zhang, J., Wang, J., Ran, P.X.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-03-2015
• 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; Transparent conductive oxides; C. Optical properties; C. Electrical properties
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2014.10.080

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.