Details

Autor(en) / Beteiligte

• Coondoo, Indrani
• Panwar, Neeraj
• Jha, A.K.

Titel

Effect of sintering temperature on the structural, dielectric and ferroelectric properties of tungsten substituted SBT ceramics

Ist Teil von

• Physica. B, Condensed matter, 2011-02, Vol.406 (3), p.374-381

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Structural, dielectric and ferroelectric properties of tungsten (W) substituted SrBi 2(Ta 1− x W x ) 2O 9 (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 T c of ∼390 °C is observed for x=0.20 sample sintered at 1200 °C. Peak-dielectric constant ( ε r ) 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 ( P r) increases with the W content up to x≤0.075. A maximum 2 P r (∼25 μC/cm 2) 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.