Local structure and dielectric behavior of Pb(Fe1/2Nb1/2)03-PbTiO3 single crystals

摘要

Pb(Fe1/2Nb1/2)03-PbTiO3 (PFNT) is a multiferroic compound having electric and magnetic orders. To further explore the structural nature of ferroic characteristics in this material, the dielectric properties and structures of Pb(Fe1/2Nb1/2)1−xTixO3 (x=0.07 and 0.48) single crystals were investigated by a combination of temperature-dependent dielectric spectra, XRD, Raman and x-ray absorption fine-structure (XAFS) spectra. Both samples exhibit a frequency-dependent dielectric anomaly, which is significantly correlated to the local structure differences.