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

A. Bhattacharya, T. Wermelinger, V. Shklover

Journal of Ceramic Science and Technology, Vol. 3, No. 4 (2012), pp. 211-214

DOI: 10.4416/JCST2012-00028

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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.

Keywords

TBC, YSZ, Raman spectroscopy, XRD, ZrO2

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