MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of Titania Doping on Phase Stability of Zirconia Bioceramics in Hot Water
Yorinobu TakigawaYukihisa NakaKenji Higashi
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2007 Volume 48 Issue 3 Pages 332-336

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Abstract

The effect of titania doping on tetragonal to monoclinic (t-m) phase transformation of zirconia bioceramics is evaluated by ageing in hot water at 413 K. The examined materials are 3 mol%Y2O3 stabilized tetragonal zirconia polycrystal (3Y-TZP) and 1.5, 3.0 and 7.7 mol%TiO2-doped 3Y-TZP. The t-m phase transformation of 3Y-TZP is accelerated by titania doping in all the specimen examined. However, 7.7 mol%TiO2-doped TZP shows better phase stability than 1.5 or 3.0 mol%TiO2-doped one. This change in phase stability of 7.7 mol%TiO2-doped TZP cannot be simply explained from the difference of grain size or the change in the axial ratio, ca. XRD analysis reveals that the distance between nearest neighbor anion and cation site significantly decreases only in 7.7 mol%TiO2-doped TZP. This result indicates that the binding energy between dopant and oxygen vacancy affects the phase stability as well as the change in the axial ratio, ca.

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© 2007 The Japan Institute of Metals and Materials
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