Substituent Influence of Yttria by Gadolinia on the Tetragonal Phase Stability for Y2O3–Ta2O5–ZrO2 Ceramics at 1300 °C

doi:10.1016/j.jmst.2013.12.008

J. Mater. Sci. Technol.

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Substituent Influence of Yttria by Gadolinia on the Tetragonal Phase Stability for Y₂O₃–Ta₂O₅–ZrO₂ Ceramics at 1300 °C

Xiaoqing Niu¹⁾, Min Xie¹⁾, Fen Zhou¹⁾, Rende Mu²⁾, Xiwen Song¹⁾, Shengli An¹⁾

1) Inner Mongolia Key Laboratory of Advanced Ceramics and Device, School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China
2) Beijing Institute of Aeronautical Materials, Beijing 100095, China

Received:2012-07-11 Revised:2013-03-06 Online:2014-04-15 Published:2014-04-22
Contact: X. Song
Supported by:
National Natural Science Foundation of China under Grant No. 50974074, the Program for New Century Excellent Talents in University under Grant No. NCET-10-0910 and the Natural Science Foundation of Inner Mongolia under Grant No. 2011ZD09.

Abstract

Abstract:

The influences of equimolar substitution of yttria by gadolinia on the phase constituent and stability for Y₂O₃–Ta₂O₅–ZrO₂ ceramics have been investigated. The ceramics with the Gd content lower than 8 mol% exhibit pure tetragonal phase as well as high tetragonal phase stability. However, the high Gd containing ceramics consist of t-ZrO₂, m-ZrO₂ and monoclinic GdTaO₄ and show complicated phase evolution behaviors. The fractions of monoclinic ZrO₂ and GdTaO₄ increase with increasing Gd content, indicating that the excessive substitution of Gd for Y results in a reduction in the tetragonal phase stability. In addition, the lower Gd containing ceramics show an almost invariable tetragonality, while the higher Gd containing ceramics reveal a composition-dependent tetragonality. Accordingly, an association of the tetragonal phase stability and tetragonality with the Gd concentration is established, which provides us a clue to understand the phase stability of these ceramics.

Key words: Ceramics, ZrO₂, X-ray diffraction, Thermal stability

Xiaoqing Niu, Min Xie, Fen Zhou, Rende Mu, Xiwen Song, Shengli An. Substituent Influence of Yttria by Gadolinia on the Tetragonal Phase Stability for Y₂O₃–Ta₂O₅–ZrO₂ Ceramics at 1300 °C[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2013.12.008.

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Substituent Influence of Yttria by Gadolinia on the Tetragonal Phase Stability for Y₂O₃–Ta₂O₅–ZrO₂ Ceramics at 1300 °C

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