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

Pb(Fe
_1/2
Nb
_1/2
)O
₃
-PbTiO
₃
(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(Fe
_1/2
Nb
_1/2
)
_1-x
Ti
_x
O
₃
(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.