Phase transformation and crystal growth behavior of 8mol% (SmO1.5, GdO1.5, and YO1.5) stabilized ZrO2 powders

R. Mahendran; S. P. Kumaresh Babu; S. Natarajan; S. Manivannan; A. Vallimanalan

doi:10.1007/s12613-017-1468-4

Volume 24 Issue 7

Jul. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(7): 842-849

R. Mahendran, S. P. Kumaresh Babu, S. Natarajan, S. Manivannan, and A. Vallimanalan, Phase transformation and crystal growth behavior of 8mol% (SmO_1.5, GdO_1.5, and YO_1.5) stabilized ZrO₂ powders, Int. J. Miner. Metall. Mater., 24(2017), No. 7, pp. 842-849. https://doi.org/10.1007/s12613-017-1468-4

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R. Mahendran, S. P. Kumaresh Babu, S. Natarajan, S. Manivannan, and A. Vallimanalan, Phase transformation and crystal growth behavior of 8mol% (SmO1.5, GdO1.5, and YO1.5) stabilized ZrO2 powders, Int. J. Miner. Metall. Mater., 24(2017), No. 7, pp. 842-849. https://doi.org/10.1007/s12613-017-1468-4

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Research Article

Phase transformation and crystal growth behavior of 8mol% (SmO_1.5, GdO_1.5, and YO_1.5) stabilized ZrO₂ powders

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Corresponding author:
R. Mahendran E-mail: mahendran.meta@gmail.com
Received: 13 December 2016; Revised: 20 January 2017; Accepted: 15 February 2017

Abstract

Abstract

Nanocrystalline powders of ZrO₂-8mol%SmO_1.5(8SmSZ), ZrO₂-8mol%GdO_1.5 (8GdSZ), and ZrO₂-8mol%YO_1.5(8YSZ) were prepared by a simple reverse-coprecipitation technique. Differential thermal analysis/thermogravimetry (DTA/TG), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM) were used to study the phase transformation and crystal growth behavior. The DTA results showed that the ZrO₂ freeze-dried precipitates crystallized at 529, 465, and 467℃ in the case of 8SmSZ, 8GdSZ, and 8YSZ, respectively. The XRD and Raman results confirmed the presence of tetragonal ZrO₂ when the dried precipitates were calcined in the temperature range from 600 to 1000℃ for 2 h. The crystallite size increased with increasing calcination temperature. The activation energies were calculated as 12.39, 12.45, and 16.59 kJ/mol for 8SmSZ, 8GdSZ, and 8YSZ respectively.
- zirconia;
- thermal analysis;
- reverse coprecipitation;
- activation energy

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