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Observation of Fano asymmetry in Raman spectra of and perovskite nanocubes
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Scanning electron microscopy image of nanocubes. SEM images were obtained on a Hitachi S4700 instrument with an accelerating voltage of . (b) SEM image of nanocubes. (c) TEM image of nanocubes. (d) TEM image of a single nanocube. TEM images were obtained on a Philips CM12 instrument at an accelerating voltage of . (e) Raman spectra of bulk and nanocubes at room temperature. The spectra for the nanocubes are represented by dashed lines. The two spectra are offset from each other for clarity. Fits to the , , and peaks for the nanocubes are shown. and were fitted using Lorentzian line shapes, whereas the peak was fitted with a Fano profile (fits are superimposed on the spectra as solid lines). The Fano line shape is depicted more clearly in the inset to (e). The Fano fitting parameters are , , , and . (f) Raman spectra of bulk and nanocubes (dashed lines) at room temperature. All the peaks can be fitted with Lorentzian line shapes (shown for the nanocubes as solid lines). Peak is attributed to a lattice mode, to the O–Ti–O bending modes, and to a torsional mode.

Image of FIG. 2.
FIG. 2.

(a) Representative Raman spectra obtained at different temperatures for nanocubes. The temperature was controlled within using a Linkam TMS 600 stage. (b) Temperature dependence of the asymmetry parameter as obtained by fitting the Fano profiles to Eq. (1).

Image of FIG. 3.
FIG. 3.

(a) Room temperature Raman spectra for nanocubes. [(b) and (c)] Plots depicting the peak position of structural modes identified in each with increasing Sr concentration. The mode is marked for the and 0.3 samples.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Observation of Fano asymmetry in Raman spectra of SrTiO3 and CaxSr1−xTiO3 perovskite nanocubes