Title of article :
Ferroelectric relaxor behavior in hafnium doped barium-titanate ceramic
Author/Authors :
Anwar، نويسنده , , Shahid and Sagdeo، نويسنده , , P.R. and Lalla، نويسنده , , N.P.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Abstract :
Temperature and frequency dependence of the real (ε′) and imaginary (ε″) parts of the dielectric permitivity of cubic Ba(Ti0.7Hf0.3)O3 ceramic has been studied in the temperature range of 100 K to 350 K at the frequencies 0.1 kHz, 1 kHz, 10 kHz, 100 kHz for the first time. Diffuse phase transition and frequency dispersion is observed in the permittivity-vs-temperature plots. This has been attributed to the occurrence of relaxor ferroelectric behavior. The observed relaxor behavior has been quantitatively characterized based on phenomenological parameters. A comparison with the Zr doped BaTiO3 has also been presented. For Hf doped samples transmission electron microscopy (TEM) characterization do show the presence of highly disordered microstructure at length scales of few tens of nano-meters.
Keywords :
A. Ferroelectric , C. Structure , D. Dielectric
Journal title :
Solid State Communications
Journal title :
Solid State Communications