Raman Spectra of Polycrystalline Solids; Application to thePbTi1−xZrxO3System

It is shown that Raman scattering from polycrystalline piezoelectric solids contains all of the essential features of Raman single-crystal spectra even when the crystal spectrum is quite anisotropic. As an illustration of the Raman powder technique, the ceramic ferroelectric-antiferroelectric system PbTi${\mathrm{O}}_3$-PbZr${\mathrm{O}}_3$ has been investigated and the "soft" $E\left(\mathrm{TO}\right)$ optical phonon modes measured in the tetragonal ferroelectric region.