Abstract
The Raman spectra in (1−x)Pb(Zn 1/3 Nb 2/3 )O3 − xPbTiO 3 (PZN-xPT) mixed crystals were measured under several optical geometries below 400 cm − 1 . Raman modes in the low frequency region were assigned on the basis of our spectrum in the poled sample of PZN-20%PT. Low frequency Raman modes in PZN-PT (x ≤ 20%) were confirmed to be primarily caused by ferroelectric modes rather than 1:1 B-site ordering. It was found that the Raman scattering is sensitive for the inhomogeneous ferroelectric distortion or existence of the polar nano-region in the cubic phase of the PZN-type relaxor. Both the E(TO1) and A 1 (TO1) modes, corresponding to the soft modes in PbTiO 3 , do not almost depend on temperature near the ferroelectric phase transition point in PZN-PT (x ≤ 20%).
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