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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Phase Evaluation of YSZ upon Doping with Ta5+, Ti4+ and Ca2+ with Combined Raman and XRD Analysis

A. Bhattacharya1, T. Wermelinger2, V. Shklover1

1 Laboratory of Crystallography, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland
2 Institute of Nanometallurgy, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland

received August 20, 2012, received in revised form November 1, 2012, accepted November 7, 2012

Vol. 3, No. 4, Pages 211-214   DOI: 10.4416/JCST2012-00028

Abstract

To improve the phase stability of 7YSZ (7 wt%-Y2O3-doped ZrO2), it has been doped with larger (Ca2+) and smaller (Ti4+ or Ta5+) ions. Complementary Raman and XRD studies of these stabilized systems have been performed. The tetragonal symmetry of the Ta5+-ion-doped YSZ sample and the Ti4+-doped YSZ sample, and the cubic symmetry of Ca2+-doped YSZ have been confirmed both by means of XRD and Raman analyses. Raman scattering measurements show shifts of characteristic peaks when the YSZ is doped with Ta5+, Ti4+ and Ca2+ cations. The peak shift increased with increasing dopant concentration in the ZrO2 lattice. The Ta-doped YSZ sample heat-treated below 1500 °C contained some YTaO4 phase, which was confirmed by means of XRD as well as by Raman spectroscopy. The effect of Ca2+ ion doping on the Raman peak shift was much higher than that of Y3+ ion doping. In this work it has been highlighted that Raman spectroscopy is a useful tool complementing XRD, for qualitative comparison of the doping effect on the lattice parameters of ZrO2.

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Keywords

TBC, YSZ, Raman spectroscopy, XRD, ZrO2

References

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