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- W2020486578 abstract "Abstract Infrared and Raman spectroscopic studies of ZrO2 doped with Y2O3 (1, 2, 3, and 8 mole%) and 12 mole% CeO2 have been done with a conventional X-ray diffraction (XRD) technique. Infrared and Raman spectra of these doped ZrO2 polymorphs were well characterized by their unique spectral features or optical phonons. Low-temperature infrared spectroscopy also revealed that the 580 and 725 cm-1 modes suddenly evolve at about 123 K when the tetragonal (t)-monoclinic (m) phase transition is induced in ZrO2-12 mole% CeO2(Z12C); the analysis based on the oscillator strength of the Bu mode at 580 cm-1 revealed that the t-m phase transition occurs discontinuously with a very narrow transition width of ∼2 K, whereas the oscillator strength of the Eu mode associated with the t-phase decreased toward the phase transition. It was concluded that the nonoccurrence of the t-m phase transition in tetragonal ZrO2-3 mole% Y2O3(Z3Y) originates in its being less tetragonal (c/a = 1.012) than Z12C (c/a = 1.018), in the context of the dependence of the transformability on the tetragonality, as proposed by Kim. The downshift in frequency of the Raman modes for Z12C provided more evidence of a larger axial ratio for Z12C than for Z3Y through an expansion in the a-axis and the c-axis, as confirmed by XRD. It is stressed that traces of another existent phase (not predominant) at the surface and/or in the bulk can be substantiated by using infrared and Raman spectroscopic techniques at the same time as XRD." @default.
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- W2020486578 date "1994-06-01" @default.
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- W2020486578 title "Infrared and Raman Spectroscopic Studies of ZrO2 Polymorphs Doped with Y2O3 or CeO2" @default.
- W2020486578 doi "https://doi.org/10.1006/jssc.1994.1160" @default.
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