Borkar, Hitesh and Kumar, Ashok
(2016)
Conduction Phenomenon of Al3+ Modified Lead Free (Na0.5Bi0.5)(0.92)Ba0.08TiO3 Electroceramics.
In: DAE Solid State Physics Symposium .
Abstract
Choice of proper dopants at A or B-site of ABO(3) perovskite structure can modify the morphotropic phase boundary (MPB), and hence functional properties of polar systems. The chemical nature of donor or acceptor will significantly influence the fundamental properties. Lead-free ferroelectrics have vast potential to replace the lead-based ceramics. The (Na0.5Bi0.5)(1-x)BaxTiO3 (NBT-BT) (at x=0.08) near MPB with small substitution of trivalent cations (Al3+) has been synthesized by solid state reaction route. The aim to choose the trivalent cations (Al3+) was its relatively smaller radii than that of Bi3+ cations to develop the antipolar phases in the ferroelectric ceramic. Structural, morphological and elemental compositional analyses were studied by X-ray diffraction (XRD), Secondary electron microscope (SEM) and Energy-dispersive X-ray spectroscopy (EDAX), respectively. Ferroelectric studies were carried out on various compositions of (Na0.46Bi0.46-xAlxBa0.08)TiO3 (NBAT-BT) (x= 0, 0.05, 0.07, 0.10) electroceramics. It was observed that with increase in concentration of Al the ferroelectricity state changes from soft to hard. Temperature dependent dielectric spectroscopy shows broad dielectric dispersion. The Al doping diminishes the relaxor behavior of NBT-BT ceramics. Impedance spectroscopy shows that electrical resistivity and relaxation frequency decreases with increase in Al-concentration. Modulus spectra indicate that Al significantly change the bulk capacitance of NBT-BT.
| Item Type: |
Conference or Workshop Item
(Paper)
|
| Additional Information: |
DAE Solid State Physics Symposium Location: Amity Univ, Noida, INDIA Date: DEC 21-25, 2015 |
| Subjects: |
Applied Physics/Condensed Matter |
| Divisions: |
UNSPECIFIED |
| Depositing User: |
Dr. Rajpal Walke
|
| Date Deposited: |
16 Nov 2017 08:31 |
| Last Modified: |
16 Nov 2017 08:31 |
| URI: |
http://npl.csircentral.net/id/eprint/2166 |
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