The Electrical Conductivity and Infrared Properties of Ba-Doped SmCoO3-δ Composite Oxides

Authors :: Chen, Le
Lu, Chun Hua
Zhao, Yuan Zheng
Zhang, Wen Yan
Ni, Ya Ru
Xu, Zhong Zi
Source :: Advanced Materials Research; May 2011, Vol. 239 Issue: 1 p687-690, 4p
Publication Year :: 2011
Abstract: Layered SmBaCo<subscript>2</subscript>O<subscript>5+</subscript><subscript>δ</subscript> with the cation-ordered double perovskite structure were synthesized by the solid-state reaction route and characterized by thermal analysis, X-ray diffraction, infrared spectrum, electrical conductivity and infrared emissivity. The Sm<subscript>1-x</subscript>Ba<subscript>x</subscript>CoO<subscript>3</subscript><subscript> </subscript>(SBCO) system shows the different crystal structures with the variation of barium content, which results in the different electrical behavior. The electrical conductivity reaches maximum when x is 0.5 with SmBaCo<subscript>2</subscript>O<subscript>5.54</subscript> phase. The infrared absorption occurs at about 600 cm<superscript>-1</superscript> for all the samples which were attributed to Co-O stretching modes. The peak shifted to a lower frequency with the increase of doping level. In addition, the comparison of electrical and emissivity measurements suggested that variation of infrared emissivity is in agreement with the electrical properties.

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