Issue 18, 2003
From the journal:

Physical Chemistry Chemical Physics

Unusual calcination temperature dependent tetragonal–monoclinic transitions in rare earth-doped zirconia nanocrystals†

Gang Xu,a   Ya-Wen Zhang,*a   Bo Han,b   Mei-Jun Li,b   Can Lib  and  Chun-Hua Yan*a  

* Corresponding authors

a State Key Lab of Rare Earth Materials Chemistry and Applications & PKU-HKU Joint Lab on Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing, China
E-mail: chyan@chem.pku.edu.cn
Fax: +86 10 62754179
Tel: +86 10 62754179

b State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, P.O. Box 110, Dalian, China

Abstract

The dependence of tetragonal-monoclinic (t → m) transitions in the hydrothermally prepared (ZrO2)0.98(RE2O3)0.02 (RE = Sc, Y) nanocrystals upon the calcination between 400–1400 °C were explored by means of X-ray diffraction (XRD), high temperature X-ray diffraction (HTXRD), near infrared Fourier transform (FT) Raman and ultraviolet (UV) Raman spectroscopies. XRD and FT Raman scattering analysis indicated that the monoclinic fraction varied discontinuously with increasing the temperature from 400 to 1400 °C, which is unusual and is mainly ascribed to the microstrain effect. HTXRD analyses (from room temperature to 1400 °C) revealed that the as-prepared samples underwent tetragonal → monoclinic (t → m) transformation at 500 °C for (ZrO2)0.98(Sc2O3)0.02 and at 200 °C for (ZrO2)0.98(Y2O3)0.02 during the cooling process. UV Raman spectra suggested that the t → m transformation initially occurred at the surface region of the calcined samples. Hence, the monoclinic phase was enriched on the surface of the zirconia grains. Finally, the size effect of the stabilizers (Y3+ and Sc3+) on the critical crystallite size and the metastability of the tetragonal phase were also discussed.

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Article information

DOI
https://doi.org/10.1039/B304966C
Article type
Paper
Submitted
02 May 2003
Accepted
31 Jul 2003
First published
21 Aug 2003

Phys. Chem. Chem. Phys., 2003,5, 4008-4014

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Unusual calcination temperature dependent tetragonal–monoclinic transitions in rare earth-doped zirconia nanocrystals

G. Xu, Y. Zhang, B. Han, M. Li, C. Li and C. Yan, Phys. Chem. Chem. Phys., 2003, 5, 4008 DOI: 10.1039/B304966C

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