Abstract
The Brillouin spectra of lead-based complex perovskite relaxors Pb[(Zn 1/3 Nb 2/3 )1 − x Ti x ]O 3 (PZN-x%PT) single crystals with x = 9%, located near the morphotropic phase boundary, have been examined in detail. The longitudinal acoustic mode became softened markedly upon cooling from 523 K down to 430 K, which was accompanied by the significant increase of the acoustic damping. Below 523 K, a quasi-elastic central peak began to appear and grew. Relaxation time estimated from the half width of the central peak increased from approximately 3 to 15 ps in the same temperature range. This reflects the slowing down of the dynamics of relaxators which is responsible for the formation of the central peak, and precursor polar nano regions at high temperatures have been suggested as a possible origin.
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