Sintering and compensation effect of donor and acceptor codoped 3 mol% Y2O3-ZrO2

✍ Scribed by San-Yuan Chen; Hong-Yang Lu

• Publisher: Springer
• Year: 1995
• Tongue: English
• Weight: 544 KB
• Volume: 30
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00356138

✦ Synopsis

Addition of 0.15-0.5 mol % acceptor oxide, AI203, to 3 mol % Y203-ZrO2 results in enhanced densification at 1350~ The enhancement is accounted for by a liquid phase sintering mechanism. While the addition of donor oxide, Ta2Os, of 0.15 2.5 mol % at 1300-1600~ results in the decrease of final density and in the destabilization ofthe tetragonal (t) phase of the 3 mol % Y2Oa-t-ZrO2 (TZP). X-ray diffractometry (XRD) reveals that the Ta205-added 3 mol % Y203-ZrO2 contains monoclinic (m) ZrO2 phase and a second Ta2Zr6017 phase. The decrease is attributed to the increase of m-ZrO2 content in these samples. Complete phase transformation from t-ZrO2 to m-ZrO2 observed in samples added with 2.5 mol % Ta205 is interpreted by the compensation effect based on donor and acceptor codoping defect chemistry.