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Effect of Tetravalent Dopants on Raman Spectra of Tetragonal Zirconia
Author(s) -
Kim DaeJoon,
Jang JooWung,
Lee HongLim
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb03003.x
Subject(s) - raman spectroscopy , dopant , tetragonal crystal system , materials science , analytical chemistry (journal) , cubic zirconia , doping , solid solution , ionic bonding , ionic radius , inorganic chemistry , mineralogy , crystallography , chemistry , ion , ceramic , crystal structure , metallurgy , optics , organic chemistry , physics , optoelectronics
Tetragonal zirconia solid solutions were prepared by the additions of ceria, titania, germania, and cassiterite into 2‐mol%‐Y 2 O 3 ‐stabilized t ‐ZrO 2 (2Y‐TZP), and the effect of the dopant size on the changes in the Raman spectra of t ‐ZrO 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 4+ ) increased and increased linearly as doping with the undersized dopants (Ti 4+ , Ge 4+ , Sn 4+ ) increased within the solubility limits of the dopants in 2Y‐TZP. The frequency of the 640 cm −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 ZrO bond between two ZrO bonds in t ‐ZrO 2 solid solutions. Although there was no consistent relationship between the change in the tetragonality of t ‐ZrO 2 solid solutions and the tetravalent cation size, the intensity ratio of the Raman modes at 609 and 640 cm −1 ( I 609 / I 640 ) decreased as the ionic size decreased.