Raman Spectroscopic Study of Oxygen Vacancies in Ce1-xTbxO2-δ Mixed Oxides

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (8): 1645.

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Raman Spectroscopic Study of Oxygen Vacancies in Ce_1-xTb_xO_2-δ Mixed Oxides

GUO Ming, PU Zhi-Ying, BI Qing-Yuan, LU Ji-Qing, LUO Meng-Fei*

Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Jinhua 321004, China

Received:2009-03-18 Online:2009-08-10 Published:2009-08-10
Contact: LUO Meng-Fei. E-mail: mengfeiluo@zjnu.cn
Supported by:
国家自然科学基金(批准号: 20473075)资助.

Abstract

Abstract:

A series of Ce_1-xTb_xO_2-δ mixed oxides were prepared by a sol-gel method. In situ Raman spectroscopy combined with X-ray diffraction(XRD), H₂-temperature programmed reduction(H₂-TPR) and O₂-temperature programmed desorption(O₂-TPD) were used to analyze oxygen vacancies in the mixed oxides under different atmospheres(O₂, He, and H₂) with 514 and 785 nm excitation laser lines and the blue shift of the F_2g vibration mode of CeO₂. The results show that increasing Tb content in the sample result in the blue shift of F_2g vibration mode of CeO₂ because of dominant effect of the shrinking of the crystal. Furthermore, the difference in the changing trend of oxygen vacancies is due to the different Raman excitation laser lines. 514 nm excitation laser line can provide the surface information, while 785 nm excitation laser line can get the whole information of the sample. The A₅₈₇/A₄₆₅ ratio reflecting the oxygen vacancies shows an inflexion under He and H₂ atmospheres could be explained by the change in microstructure of the sample along with the release of O₂ during the heating process.

Key words: In situ Raman spectroscopy; Ce_1-xTb_xO_2-δ mixed oxide; Oxygen vacancy

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GUO Ming, PU Zhi-Ying, BI Qing-Yuan, LU Ji-Qing, LUO Meng-Fei*. Raman Spectroscopic Study of Oxygen Vacancies in Ce_1-xTb_xO_2-δ Mixed Oxides[J]. Chem. J. Chinese Universities, 2009, 30(8): 1645.

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Raman Spectroscopic Study of Oxygen Vacancies in Ce_1-xTb_xO_2-δ Mixed Oxides

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