| Influence of Ba2+ Ion Substitution on the Structural,
Ferroelectric and Electrical Properties of Nano-Structured
Na0.5Bi0.5TiO3 Lead Free Piezo Ceramics |
Chilkamarri Sameera Devi,1 Madireddy Buchi Suresh,2 Gobburu Subramanyam Kumar1
and Guduru Prasad1, *
Pages : 30-36
DOI : 10.1080/0371750X.2018.1451388 |
| Abstract |
| Lead free relaxor 0.8NBT-0.2BT nano-structured ceramic composition was
processed through sol-gel technique and sintered at 1140oC for 4 h in air. The
bulk density exceeded 95% of theoretical density as determined by Archimedes
principle. The sintered samples were characterized using X-ray diffraction, field
emission scanning electron microscope, energy dispersive spectrometry, Raman,
dielectric, AC impedance, piezoelectric and ferroelectric measurements. XRD
patterns recorded at room temperature confirmed the rhombohedral phase
formation of the samples. Particle size range measured for calcined powder was
found to be of 40-50 nm and the average grain size of the final sintered sample
was 80 nm. Analysis of Raman spectral data of the sample indicated distortion of
NBT. The diffuse phase transition behaviour was investigated from versus T
curve and the temperature due to structural change coincided with abrupt jump
in (T) curve. Dielectric maximum and minimum were also evaluated to define
phase transitions of 0.8NBT-0.2BT system. NBT-BT has shown normal diffuse type
of phase transition. Charge transformational behaviour could be analyzed based
on AC and DC conductivity measurements. Ferroelectricity was also confirmed
by P-E measurements and piezoelectric constant obtained for the NBT-BT sample
was 90 pC/N.
[Keywords: Nanostructure, Sol-gel process, Ferroelectric properties, BaTiO3,
Structural applications, Piezoelectric properties] |
| Full text : Subscribe to Download Full Text |
| [Go Back] |
|
