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We investigated the dielectric properties of Pb(Fe1/2Nb1/2)1-xTixO3 singlecrystals below room temperature. Two dielectric anomalies were detected insample A while only one was detected in sample B in the temperature range90~300 K. A Debye-like relaxation with strong frequency dispersion was detectedin both samples. The pre-edge XAFS suggests that this dielectric anomaly isinduced by the hopping conductivity between Fe2+ and Fe3+. The EXAFS resultsgive us a clear picture of the local structure of iron ions. The weak frequencydependent dielectric anomaly only observed in sample A is supposed to be due tothe dipole glass behavior.

Dielectric anomalies induced by different mechanisms in Pb(Fe1/2Nb1/2)1-xTixO3 single crystals