Effect of tetravalent dopants on Raman spectra of tetragonal zirconia
- Korea Inst. of Science and Technology, Seoul (Korea, Republic of). Ceramics Div.
- Yonsei Univ., Seoul (Korea, Republic of). Dept. of Ceramic Engineering
Tetragonal zirconia solid solutions were prepared by the additions of ceria, titania, germania, and cassiterite into 2-mol%-Y{sub 2}O{sub 3}-stabilized t-ZrO{sub 2} (2Y-TZP), and the effect of the dopant size on the changes in the Raman spectra of t-ZrO{sub 2} was investigated. The frequencies of the Raman modes that were associated with Zr-O bond stretching decreased as doping with the oversized cation (Ce{sup 4+}) increased and increased linearly as doping with the undersized dopants (Ti{sup 4+}, Ge{sup 4+}, Sn{sup 4+}) increased within the solubility limits of the dopants in 2Y-TZP. The frequency of the 640 cm{sup {minus}1} Raman band decreased as the square root of the unit-cell volume increased, suggesting that the ionic size of dopants governs the Raman mode that is related to the short Zr-O bond between two Zr-O bonds in t-ZrO{sub 2} solid solutions. Although there was no consistent relationship between the change in the tetragonality of t-ZrO{sub 2} solid solutions and the tetravalent cation size, the intensity ratio of the Raman modes at 609 and 640 cm{sup {minus}1} (I{sub 609}/I{sub 640}) decreased as the ionic size decreased.
- Sponsoring Organization:
- Korean Ministry of Science and Technology (Korea, Republic of)
- OSTI ID:
- 512075
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 6 Vol. 80; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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