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- W74602257 abstract "Raman and Fourier-transform infrared photoacoustic spectra of nanometer-sized grains of monoclinic ${mathrm{ZrO}}_{2}$ (5--80 nm) at room temperature are reported. A characteristic peak around 1040 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ is observed in the Raman spectra, which strengthens and shifts toward higher frequency with decrease of grain size. Its origin is attributed to a surface phonon mode of ${mathrm{ZrO}}_{2}$. The other peaks observed in the Raman spectra shift toward lower frequencies and their bandwidths broaden when the grain size is decreased. A phonon confinement model is used to calculate the size dependencies of the position and bandwidth of peaks and the results show good agreement between theory and experiment. The Fourier-transform infrared photoacoustic spectra indicate that the intensities of the absorption peaks below 1000 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ decrease, while those above 1000 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ increase, and the positions of some peaks have redshifts with a decrease of grain size. The above phenomena are also related to the quantum size and surface effects of nanomaterials." @default.
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- W74602257 date "1997-04-01" @default.
- W74602257 modified "2023-10-16" @default.
- W74602257 title "Raman and Fourier-transform infrared photoacoustic spectra of granular<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>ZrO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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- W74602257 doi "https://doi.org/10.1103/physrevb.55.8847" @default.
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