Isothermal Tetragonal to Monoclinic Phase Transition around Room Temperature in 2.0 mol% Yittria-doped Zirconia Ceramics.
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- Kubo Tomikatsu
- Department of Chemistry, Faculty of Science, Konan University Osaka Application Laboratory, Rigaku Corporation
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- Machida Nobuya
- Department of Chemistry, Faculty of Science, Konan University
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- Sakai Hiroshi
- Department of Chemistry, Faculty of Science, Konan University
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- Shigematsu Toshihiko
- Department of Chemistry, Faculty of Science, Konan University
Bibliographic Information
- Other Title
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- Isothermal Tetragonal to Monoclinic Phase Transition around Room Temperature in 2.0 モルパーセント Yittria-doped Zirconia Ceramics
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Abstract
The tetragonal to monoclinic (t-m) phase transition in 2.0 mol% yttria-doped tetragonal zirconia polycrystals (2Y-TZP) was studied by use of XRD and FT-IR diffuse scattering (DRIFT) measurements. The phase transition occurred isothermally when the 2Y-TZP powder after calcining at temperatures below 1200°C was annealed in air even at room temperature, and more than 90% of the monoclinic phase was obtained after a long period of annealing. However only about several percent and about 40% of the monoclinic phase were formed after the annealing treatments under vacuum and 1 atm air separately sealed in a 5 ml Pyrex tube, respectively. On the other hand, no phase transition occurred in air around room temperature in the 2Y-TZP powder after being calcined at temperatures above 1300°C. A broad band around 3300 cm-1 due to the existence of adsorbed water was observed in the FT-IR DRIFT spectra of the 2Y-TZP powder only after calcination below 1200°C. The t-m transition behavior of 2Y-TZP powder after calcination below 1200°C differed with that after calcination above 1300°C. The existence of adsorbed water on 2Y-TZP was essential for the t-m phase transition of 2Y-TZP to take place in air around room temperature. The amount of transformed monoclinc phase was determined by the amount of adsorbed water on 2Y-TZP and supplied water from annealing atmosphere.
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 46 (5), 496-501, 1999
Japan Society of Powder and Powder Metallurgy
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Details 詳細情報について
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- CRID
- 1390001206308815232
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- NII Article ID
- 10002262455
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 4737259
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed