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The Raman spectra in the nanocrystalline Pb 1-x Sr x TiO 3 system show that the morphotropic phase transition from the tetragonal phase to the cubic structure occurs at x c =0.57 and it can be associated with 'softening' of the lowest-frequency E(TO) phonon mode. The phase transition temperature in Pb 0.8 Sr 0.2 TiO 3 decreases with decreasing grain size. The disappearance of the ferroelectric phase of Pb 0.8 Sr 0.2 TiO 3 has been discussed as a function of grain size. The correlation between the temperature-induced and the Sr-concentration-induced phase transition in nanocrystalline Pb 1-x Sr x TiO 3 has been observed.
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Meng et al. (1994) studied this question.
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