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Synchrotron X-Ray Study of the Crystal Structure and Hydrothermal Degradation of Yttria-Stabilized Tetragonal Zirconia Polycrystal

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Structural study with synchrotron X-ray diffractometry was made on phase separation phenomena in 2, 3, and 4 mol% Y2O3-stabilized tetragonal ZrO2 polycrystal (abbreviated as 2, 3, and 4Y-TZP, respectively). The sintered body of 3Y and 4Y-TZP underwent phase separation into high and low yttrium regions as sintering temperature increased, and the tetragonal phase was assigned to both regions. The sintering body is less separated, and a large monoclinic phase was detected in 2Y-TZP. Analysis of aging kinetics of tetragonal- to monoclinic-phase transition showed that the fraction of the transformable phase agreed with that of the low yttrium region.
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Document Type: Research Article

Affiliations: 1: Tokyo Research Laboratory, Tosoh Corporation, Ayase, Kanagawa 252–1123, Japan 2: Material and Structures Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226–8503, Japan

Publication date: May 1, 2008

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