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Title: Effect of neodymium substitution on structural and ferroelectric properties of BNT ceramics

Abstract

Graphical abstract: - Highlights: • First time, we synthesized (Bi{sub 1−x}Nd{sub x}){sub 0.5}Na{sub 0.5}TiO{sub 3} system by semi wet technique. • Grain size reduced with doping and Nd acts as an inhibitor in the grain growth. • Specimen with x = 0.02 exhibits excellent ferroelectric properties at RT. • P–E loops show the co-existence of polar and non polar regions around ‘T{sub d}’. - Abstract: Polycrystalline specimens of (Bi{sub 1−x}Nd{sub x}){sub 0.5}Na{sub 0.5}TiO{sub 3} (BNNT) ceramic system with compositions x ≤ 0.04 were synthesized by semi-wet technique using ethylene glycol precursor. Structural and electrical properties were investigated in detail to observe the effect of neodymium (Nd) substitution in BNT system. XRD patterns for all the specimens showed single phase formation with rhombohedral structure. Field emission scanning electron micrographs (FE-SEM) revealed that the grain growth was inhibited significantly with Nd content. The temperature dependence behaviour of dielectric constant revealed that the depolarisation temperature ‘T{sub d}’ decreases whereas temperature of maximum dielectric constant ‘T{sub m}’ increases with Nd concentration. The piezoelectric charge coefficient (d{sub 33}) showed maxima at x = 0.02 and well defined ferroelectric behaviour was observed for all the samples.

Authors:
 [1];  [1];  [2]
  1. Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida 201307 (India)
  2. Electroceramics Group, Solid State Physics Laboratory, Timarpur, Delhi 110054 (India)
Publication Date:
OSTI Identifier:
22348595
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 51; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; DEUTERIUM IONS; ELECTRON SCANNING; FERROELECTRIC MATERIALS; FIELD EMISSION; GLYCOLS; GRAIN GROWTH; GRAIN SIZE; NEODYMIUM; PERMITTIVITY; PIEZOELECTRICITY; POLYCRYSTALS; SCANNING ELECTRON MICROSCOPY; TEMPERATURE DEPENDENCE; TRIGONAL LATTICES; X-RAY DIFFRACTION

Citation Formats

Pal, Vijayeta, Dwivedi, R.K., E-mail: rk.dwivedi@jiit.ac.in, and Thakur, O.P. Effect of neodymium substitution on structural and ferroelectric properties of BNT ceramics. United States: N. p., 2014. Web. doi:10.1016/J.MATERRESBULL.2013.11.060.
Pal, Vijayeta, Dwivedi, R.K., E-mail: rk.dwivedi@jiit.ac.in, & Thakur, O.P. Effect of neodymium substitution on structural and ferroelectric properties of BNT ceramics. United States. doi:10.1016/J.MATERRESBULL.2013.11.060.
Pal, Vijayeta, Dwivedi, R.K., E-mail: rk.dwivedi@jiit.ac.in, and Thakur, O.P. 2014. "Effect of neodymium substitution on structural and ferroelectric properties of BNT ceramics". United States. doi:10.1016/J.MATERRESBULL.2013.11.060.
@article{osti_22348595,
title = {Effect of neodymium substitution on structural and ferroelectric properties of BNT ceramics},
author = {Pal, Vijayeta and Dwivedi, R.K., E-mail: rk.dwivedi@jiit.ac.in and Thakur, O.P.},
abstractNote = {Graphical abstract: - Highlights: • First time, we synthesized (Bi{sub 1−x}Nd{sub x}){sub 0.5}Na{sub 0.5}TiO{sub 3} system by semi wet technique. • Grain size reduced with doping and Nd acts as an inhibitor in the grain growth. • Specimen with x = 0.02 exhibits excellent ferroelectric properties at RT. • P–E loops show the co-existence of polar and non polar regions around ‘T{sub d}’. - Abstract: Polycrystalline specimens of (Bi{sub 1−x}Nd{sub x}){sub 0.5}Na{sub 0.5}TiO{sub 3} (BNNT) ceramic system with compositions x ≤ 0.04 were synthesized by semi-wet technique using ethylene glycol precursor. Structural and electrical properties were investigated in detail to observe the effect of neodymium (Nd) substitution in BNT system. XRD patterns for all the specimens showed single phase formation with rhombohedral structure. Field emission scanning electron micrographs (FE-SEM) revealed that the grain growth was inhibited significantly with Nd content. The temperature dependence behaviour of dielectric constant revealed that the depolarisation temperature ‘T{sub d}’ decreases whereas temperature of maximum dielectric constant ‘T{sub m}’ increases with Nd concentration. The piezoelectric charge coefficient (d{sub 33}) showed maxima at x = 0.02 and well defined ferroelectric behaviour was observed for all the samples.},
doi = {10.1016/J.MATERRESBULL.2013.11.060},
journal = {Materials Research Bulletin},
number = ,
volume = 51,
place = {United States},
year = 2014,
month = 3
}
  • Graphical abstract: The ferroelectric properties of Nb modified Bi{sub 4}Ti{sub 3}O{sub 12}–SrBi{sub 4}Ti{sub 4}O{sub 15} intergrowth ceramics increases significantly when Bi is substituted by La. - Highlights: • La{sup 3+} substitution for Bi{sup 3+} in Nb doped Bi{sub 4}Ti{sub 3}O{sub 12}–SrBi{sub 4}Ti{sub 4}O{sub 15} ferroelectrics is reported. • The orthorhombic distortion of the structure decreased with the increasing La. • La acts as a grain growth inhibitor in the ceramics. • The remnant polarization of the ferroelectrics increased significantly with La substitution. - Abstract: The effect of La substitution on the electrical properties of SrLa{sub x}Bi{sub 8−x}Ti{sub 6.88}Nb{sub 0}.{sub 12}O{submore » 27} intergrowth Aurivillius phase ferroelectric ceramic was investigated. La content ‘x’ was ranging from 0.0 to 1.0 in a step of 0.2. The ceramic phase was synthesized through a modified oxalate route. X-ray diffraction was used to identify the phase and to investigate the change in lattice parameter and microstrain with the substitution. La-substitution does not affect the crystal structure of the intergrowth. Microstructural investigation revealed that the grain size of the ceramic decreases with La addition. The lattice parameters and orthorhombicity of intergrowth structure were found to decrease with increasing La substitution. The temperature dependence of dielectric behavior was investigated in the temperature range 30–700 °C and the frequency of 100 kHz. The remnant polarization 2P{sub r} increased and the Curie temperature T{sub c} decreased with the increase in the La substitution.« less
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