Structure on Surface and the Bulk Shell of Nanosized PrOy-ZrO2 Solid Solution Prepared by Sol-gel Method

Chem. J. Chinese Universities

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Structure on Surface and the Bulk Shell of Nanosized PrO_y-ZrO₂ Solid Solution Prepared by Sol-gel Method

YING Yue-Fang, LUO Meng-Fei, WANG Yue-Juan, XIE Guan-Qun, WANG Xue-Qin, HE Mai, WANG Xue-Li

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

Received:2006-03-13 Revised:1900-01-01 Online:2007-02-10 Published:2007-02-10
Contact: LUO Meng-Fei

Abstract

Abstract: The characterization for PrO_y-ZrO₂solid solutions prepared by improved sol-gel method was performed by means of Raman, XRD, TEM and so on. It is found that the grain size of PrO_y-ZrO₂solid solution calcined at 650 ℃ is 5—10 nm, and that of PrO_y-ZrO₂solid solution calcined at 950 ℃[x(Pr)>16%] is about 20 nm. At a higher Pr content, phase transformation towords a higher-symmetrical phase(tetragonal or cubic) was observed. The results of phase analysis obtained by Raman spectroscopy were different from the corresponding results of XRD, which implies a structure difference between the surface and the bulk shell of the samples. With the increase of the Pr content, the m→t→c phase tramsformation occurred in the bulk area and the m→t→t" phase tramsformation occurred in the surface area. The surface region is more easily to form a low symmetry and disorder structure.

Key words: PrO_y-ZrO₂, Raman spectrum, XRD, Sol-gel method

CLC Number:

O643

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YING Yue-Fang, LUO Meng-Fei, WANG Yue-Juan, XIE Guan-Qun, WANG Xue-Qin, HE Mai, WANG Xue-Li. Structure on Surface and the Bulk Shell of Nanosized PrO_y-ZrO₂ Solid Solution Prepared by Sol-gel Method[J]. Chem. J. Chinese Universities, doi: .

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Structure on Surface and the Bulk Shell of Nanosized PrO_y-ZrO₂ Solid Solution Prepared by Sol-gel Method

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