2008/10/08 by Kui Liu, Xinyi Zhang, Liu, Kui +8
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Dielectric properties of ceramics #Geophysical and Geoelectrical Methods #Multiferroics and related materials #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.0810.1346
12 pages, 5 figures, 1 table
arxiv created 2008/12/24 · arxiv updated 2009/12/01
We investigated the dielectric properties of Pb(Fe1/2Nb1/2)1-xTixO3 single crystals below room temperature. Two dielectric anomalies were detected in sample A while only one was detected in sample B in the temperature range 90~300 K. A Debye-like relaxation with strong frequency dispersion was detected in both samples. The pre-edge XAFS suggests that this dielectric anomaly is induced by the hopping conductivity between Fe2+ and Fe3+. The EXAFS results give us a clear picture of the local structure of iron ions. The weak frequency dependent dielectric anomaly only observed in sample A is supposed to be due to the dipole glass behavior.