Raman spectra of tetragonal zirconia were studied for the systems ZrO 2 ‐Y 2 O 3 , ZrO 2 ‐CeO 2 , ZrO 2 ‐Y 2 O 3 ‐Nb 2 O 5 , and ZrO 2 ‐Y 2 O 3 ‐Ta 2 O 5 There was no change in the Raman bands for tetragonal ziraconia in the ZrO 2 ‐Y 2 O 3 system as a function of Y 2 O 3 content . On the other hand, in the ternary systems, the Raman lines corresponding to the stretching modes of two sets of cation‐oxygen bonds shifted to greater wave numbers as either Nb 2 O 5 Contents increased in Y 2 O 3 ‐stabilized tetragonal zirconia. This difference was interpreted by local bonding environments of the pentavalent cations, which were supposed to occupy tetrahedral sites in teteragonal zirconia solid solutions.
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Kim et al. (1993) studied this question.
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