Abstract
Nanosized perovskite (Pb0.7Sr0.3)TiO3 powders have been studied by Raman scattering to characterize the dielectric property derived from the particle size effect. All the optical phonons were assigned while referring to previously reported Raman spectra of PbTiO3. The frequencies of the soft E(1TO) and A1(1TO) modes show a slight hardening with a decrease in particle size. The size dependences of the clamped dielectric constants along the a and c axes characterized by the effect of the phonon confinement are evaluated by the Lyddane–Sachs–Teller relation using the observed frequencies of polar modes with E(x,y) and A1(z) symmetries, respectively.
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