Effect of sintering temperature on the structural, dielectric and ferroelectric properties of tungsten substituted SBT ceramics |
| |
Authors: | Indrani Coondoo Neeraj PanwarAK Jha |
| |
Institution: | a Thin film and Materials Science Laboratory, Department of Applied Physics, Delhi Technological University (formerly Delhi College of Engineering), Delhi 110042, India b Department of Physics, University of Puerto Rico, San Juan, PR 00931, USA |
| |
Abstract: | Structural, dielectric and ferroelectric properties of tungsten (W) substituted SrBi2(Ta1−xWx)2O9 (SBTW) x=0.0, 0.025, 0.05, 0.075, 0.1 and 0.2] have been studied as a function of sintering temperature (1100-1250 °C). X-ray diffraction patterns confirm the single-phase layered perovskite structure formation up to x=0.05 at all sintering temperatures. The present study reveals an optimum sintering temperature of 1200 °C for the best properties of SBTW samples. Maximum Tc of ∼390 °C is observed for x=0.20 sample sintered at 1200 °C. Peak-dielectric constant (εr) increases from ∼270 to ∼700 on increasing x from 0.0 to 0.20 at 1200 °C sintering temperature. DC conductivity of the SBTW samples is nearly two to three orders lower than that of the pristine sample. Remnant polarization (Pr) increases with the W content up to x≤0.075. A maximum 2Pr (∼25 μC/cm2) is obtained with x=0.075 sample sintered at 1200 °C. The observed behavior is explained in terms of improved microstructural features, contribution from the oxygen and cationic vacancies in SBTW. Such tungsten substituted samples sintered at 1200 °C exhibiting enhanced dielectric and ferroelectric properties should be useful for memory applications. |
| |
Keywords: | Ceramics X-ray diffraction Dielectric Ferroelectric |
本文献已被 ScienceDirect 等数据库收录! |
|