Synthesis and Characterization of Nanocrystalline Ce0.8 Nd0.2 O2-δ Solid Solution

Abstract

Abstract: The solid solution Ce_0.8 Nd_0.2 O_2-δ was prepared by sol-gel method. The XRD measurements showed that the product obtained by sintering the fresh gel at 200 ℃ crystallized in a single fluorite structure and its grain size was calculated to be ca. 7.2 nm by Scherrer formula. With the increase of sintering temperature, the grain size of solution increases. Afew of Ce ³⁺ ions were detected by EPRmeasurement. The first-order Raman spectra of the solid solutions exhibited two peaks. The strong band F_2g mode at a lower frequency is assigned to symmetric breathing mode of the oxygen atoms around cerium ions, while the weak band at ca. 570 cm^-1 is related with the existence of oxygen vacancies. With the grain decrease, the F_2g mode shifts to the lower frequency, while the half height width becomes broaden. The ionic conductivity for the solid solution Ce_0.8 Nd_0.2 O_2-δ at 500 ℃( σ 500 ℃ ) is 2.65×10^-3 S·cm^-1, and the activation energy is 0.82 eV.

Key words: Ce_0.8 Nd_0.2 O_2-δ, Ionic valency state, Raman spectrum, Conductivity

CLC Number:

O614.33

TrendMD:

LIN Xiao-Min, LI Li-Ping, LUO Wei, SU Wen-Hui . Synthesis and Characterization of Nanocrystalline Ce_0.8 Nd_0.2 O_2-δ Solid Solution[J]. Chem. J. Chinese Universities, 2001, 22(4): 531.

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Synthesis and Characterization of Nanocrystalline Ce_0.8 Nd_0.2 O_2-δ Solid Solution

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