Isothermal Tetragonal to Monoclinic Phase Transition around Room Temperature in 2.0 mol% Yittria-doped Zirconia Ceramics.

• Kubo Tomikatsu

  Department of Chemistry, Faculty of Science, Konan University Osaka Application Laboratory, Rigaku Corporation

• Machida Nobuya

  Department of Chemistry, Faculty of Science, Konan University

• Sakai Hiroshi

  Department of Chemistry, Faculty of Science, Konan University

• Shigematsu Toshihiko

  Department of Chemistry, Faculty of Science, Konan University

書誌事項

タイトル別名

• Isothermal Tetragonal to Monoclinic Phase Transition around Room Temperature in 2.0 モルパーセント Yittria-doped Zirconia Ceramics

抄録

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.

収録刊行物

• 粉体および粉末冶金

  粉体および粉末冶金 46 (5), 496-501, 1999

  一般社団法人 粉体粉末冶金協会

キーワード

• tetragonal zirconia polycrystals
• isothermal t-m phase transition
• adsorbed water
• diffusion of OH<SUP>-</SUP> ions

詳細情報

• CRID: 1390001206308815232
• NII論文ID: 10002262455
• NII書誌ID: AN00222724
• DOI: 10.2497/jjspm.46.496
• ISSN: 18809014
• ISSN: 05328799
• NDL書誌ID: 4737259
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4737259
• 本文言語コード: en
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