The Raman spectra for PbTiO 3 of various grain sizes at different hydrostatic pressures have revealed that the soft E(1TO) phonon mode appears to undergo a red shift in frequency and increases in linewidth with decreasing grain size, and that the pressure dependences of the soft mode in nanocrystalline PbTiO 3 can be correlated with the diffuse phase transition.
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Meng et al. (1994) studied this question.
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