Dielectric Relaxation In 91% Pb(Zn1/3nb2/3)O-3-9% Pbtio3 Single Crystal At Low Temperature

The temperature dependent dielectric response of <001>-oriented 91% Pb(Zn1/3Nb2/3)O-3-9% PbTiO3 single crystal has been studied at various frequencies. A dielectric relaxation process with a broad distribution of time constant has been observed below 180 K. The peak temperature of the dielectric loss can be fitted well with Volger-Fulcher relation. We assume this relaxation process can be attributed to the freezing of ferroelectric macrodomain walls induced by the pinning of point defects. (C) 2004 American Institute of Physics.