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Citation: Hu Gang*, Zhang Peng. AN X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF La_1-xSr_xCoO₃ Ⅲ. THE REDUCTION AND SURFACE STATE OF LaCoO₃[J]. Acta Physico-Chimica Sinica, ;1988, 4(02): 172-176. doi: 10.3866/PKU.WHXB19880211 shu

AN X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF La_1-xSr_xCoO₃ Ⅲ. THE REDUCTION AND SURFACE STATE OF LaCoO₃

Hu Gang* ,
Zhang Peng

1.
Changchun Institute of Applied Chemistry; Academia Sinica

Received Date: 14 May 1986
Available Online: 15 April 1988

The reduction of LaCoO_3 has been studied by XPS. It is shown that the degree of reduction of cobalt is characterized by the peak intensity of shake-up satellite of Co 2p_(1/2) level. The reduction of Co~(3+) to Co~(2+) in LaCoO_3 is appeared at 400 ℃. When LaCoO_3 is reduced by H_2 at 600 ℃, the cobalt is converted into metallic form, meanwhile the structure of La_2O_3 is identified by X-ray diffraction. After reduction of LaCoO_3 the separation energy between La 3d_(5/2) level and its shake-up satellite peak is 3.1 eV and the intensity ratio of shake-up satellite to its parent peak for La 3d_(5/2) level is 0.76. These values are approximately sam e as those of La(OH)_3, but they are different from those of La_2O_3. Therefore, La(OH)_3 is formed on surface after reduction of LaCoO_3.
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AN X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF La1-xSrxCoO3 Ⅲ. THE REDUCTION AND SURFACE STATE OF LaCoO3

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AN X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF La_1-xSr_xCoO₃ Ⅲ. THE REDUCTION AND SURFACE STATE OF LaCoO₃