The Redistribution of Electrons in La_1-xSr_xCoO₃ Induced by Distortion of CoO₆ Octahedron

Abstract:

The La_1-xSr_xCoO₃ (x =0.0, 0.1, 0.2 and 0.3) samples were prepared by solid-state reaction method. The X-ray diffraction patterns show that the samples are of R-3c spacegroup and the relative intensity of (024) plane diffraction peak increases with the increase of Sr concentration. The x-ray absorption fine structure data of Co ions can be fitted with 2 and 3 different scattering paths for the samples with x=0, 0.1 and for x=0.2 and 0.3, respectively. A new peak arises in x-ray absorption spectra of O ions. These results suggest a relationship between the variations of electron densities and local structure distortion. Both the valence band photoemission and x-ray absorption spectra indicate the existence of possible phase separation scenario that comes from the different types of Co-O bonds which coexist in one sample.

• Periodical: Advanced Materials Research (Volume 815)
• Pages: 845-853
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.815.845
• Online since: October 2013
• Authors: Hao Liu, Hong Guang Zhang, Yong Tao Li, Xue Guang Dong, Yuan Yuan Chen, Ling Shan Chen, Kai Chen, Qing Teng Hou, Xiao Peng Ge, Qi Li
• Keywords: Cobaltite, Distortion, Local Structure, XAS, XPS

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