Raman scattering study of thermally reduced stabilized cubic zirconia

✍ Scribed by Morell, G.; Katiyar, R. S.; Torres, D.; Paje, S. E.; Llopis, J.

• Book ID: 121684705
• Publisher: American Institute of Physics
• Year: 1997
• Tongue: English
• Weight: 331 KB
• Volume: 81
• Category: Article
• ISSN: 0021-8979
• DOI: 10.1063/1.363941

✦ Synopsis

We investigated the Raman spectra of thermally reduced and untreated Y- and Ca-stabilized cubic zirconia. A substantial decrease in Raman activity was observed in the acoustic mode region upon reduction. Analyses of these spectra as a phonon density of states and of the observed spectral changes indicate that the reduced states are more ordered than the untreated one. This is consistent with a nonrandom arrangement of vacancies, which produces the superposition of periodic sequences of vacancies within domains. This, in turn, causes the increment in coherence length of phonons that is manifested as a decrease in acoustic mode activity.