Temperature and Frequency Dependence of the Low-Frequency Dielectric Response and the Electrical Conduction of Lead-Free Na0.5Bi0.5TiO3 Ferroelectric Ceramics

2013 ◽  
Vol 63 (4) ◽  
pp. 473-479
Author(s):  
Su Tae CHUNG ◽  
Myung Ho KIM ◽  
Jin Soo KIM*
Keyword(s):  
Frequency Dependence ◽  
Electrical Conduction ◽  
Dielectric Response ◽  
Low Frequency ◽  
Lead Free ◽  
Ferroelectric Ceramics

scholarly journals Enhanced energy storage performance and fatigue resistance of Mn-doped 0.7Na0.5Bi0.5TiO3–0.3Sr0.7Bi0.2TiO3 lead-free ferroelectric ceramics

2020 ◽  
pp. 1-10
Author(s):  
Jinbo Wang ◽  
Huiqing Fan
Keyword(s):  
Energy Storage ◽  
Fatigue Resistance ◽  
Dielectric Response ◽  
Lead Free ◽  
Ferroelectric Ceramics ◽  
Relaxor Behavior ◽  
Storage Performance ◽  
Energy Storage Properties ◽  
Mn Doped ◽  
Storage Properties

The validity of Mn element on enhanced energy storage performance and fatigue resistance of Mn-doped 0.7Na0.5Bi0.5TiO3–0.3Sr0.7Bi0.2TiO3 lead-free ferroelectric ceramics (BNT–BST–xMn) is certified by doping. The effects of Mn modification on the dielectric behavior, ferroelectric, energy storage properties, and AC impedance are comprehensively investigated. It is found that the average grain size of the ceramics modified by Mn additions is reduced slightly. Moreover, the relaxor properties are evidently enhanced with the increased Mn content. The AC impedance spectra can even better clarify the dielectric response and relaxor behavior. The results suggest that both of the dielectric response and relaxor behavior are determined by defects especially concentration of the oxygen vacancy. The superior energy storage properties are realized at x = 0.05 with an energy storage density (Wrec) of 1.33 J/cm3 as well as energy storage efficiency (η) of 86.2% at 100 kV/cm, accompanied with a superior thermal stability. BNT–BST–5Mn ceramics can maintain a stable energy storage performance within 106 fatigue cycles, indicating an excellent fatigue resistance.

Low-Frequency Dielectric Dispersion and Impedance Spectroscopy of lead-free (Na$_{0.5}$Bi$_{0.5}$)TiO$_3$(NBT) Ferroelectric Ceramics

2009 ◽  
Vol 55 (2(1)) ◽  
pp. 879-883 ◽  
Author(s):  
Jin Soo Kim ◽  
Byung Chun Choi ◽  
Jung Hyun Jeong ◽  
Su Tae Chung ◽  
Sang-Bock Cho ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Low Frequency ◽  
Dielectric Dispersion ◽  
Lead Free ◽  
Ferroelectric Ceramics

DIELECTRIC RESPONSE AND IMPEDANCE SPECTROSCOPY OF (Na0.5Bi0.5)0.95Ba0.05Zr0.04Ti0.96O3 FERROELECTRIC CERAMIC

2012 ◽  
Vol 02 (03) ◽  
pp. 1250019
Author(s):  
B. TILAK
Keyword(s):  
Transition Temperature ◽  
Impedance Spectroscopy ◽  
Dielectric Response ◽  
Ferroelectric Ceramic ◽  
Lead Free ◽  
Ferroelectric Ceramics ◽  
Dielectric Susceptibility ◽  
Relaxation Processes ◽  
Average Grain Size ◽  
Wide Range

A new lead-free ferroelectric relaxor ceramic was prepared by conventional solid-state synthesis by modifying A-site and B-site in (Na0.5Bi0.5)TiO3 system, i.e., (Na0.5Bi0.5)0.95Ba0.05Zr0.04Ti0.96O3 (0.05BNBZT). X-ray diffraction studies reveal a single phase rhombohedral structure. Crystallite size and strain analysis has been done by Debye–Scherrer and Williamson–Hall technique. The tolerance factor is 0.81, indicating a stable Perovskite structure of the material. Scanning electron micrograph of the material shows a distribution of grains, average grain size is 1.41 μm. Dielectric response of (Na0.5Bi0.5)0.95Ba0.05 Zr0.04Ti0.96O3 , ferroelectric ceramic has been studied as a function of frequency over a wide range of temperatures. The studied ceramic exhibited maximum frequency dispersion in both real and imaginary part of dielectric susceptibility at and around the dielectric transition temperature (Tm). The frequency dependence of transition temperature, Tm (temperature of the maximum of dielectric constant) was studied in terms of Vogel–Fulcher relation. The dielectric relaxation of (Na0.5Bi0.5)0.95Ba0.05Zr0.04Ti0.96O3 ceramic was studied at different temperatures using the complex impedance (Z*) and electrical modulus (M*) formalism. Impedance measurements were made on over a wide range of temperatures (300–600°C) and frequencies (45 Hz–5 MHz) which show the presence of both grain and grain boundary effects in the material. The Impedance spectroscopy is shown to be an efficient method capable of detecting the contributions of the resistances of grain boundaries (at higher temperature), in addition to granular contribution (at all temperatures), which influences the device properties of a material. The electric modulus (M*) formalism used in the analysis enabled us to distinguish and separate the relaxation processes. Conductivity studies in the material obey the Jonscher's power law in frequency (45 Hz–5 MHz) and temperature (30–600°C). These results give evidence that the lead-free ferroelectric ceramics is extensively may be used for device and electronic applications, when compared with lead-based materials.

Dielectric and Conduction Properties of Lu3NbO7 Transparent Ceramic

2017 ◽  
Vol 898 ◽  
pp. 1681-1685 ◽  
Author(s):  
Li Qiong An ◽  
D.S. Wang ◽  
Run Hua Fan ◽  
Li Hua Dong
Keyword(s):  
Electrical Conduction ◽  
Dielectric Response ◽  
Low Frequency ◽  
Space Charge Polarization ◽  
Nyquist Plot ◽  
Dielectric Dispersion ◽  
Transparent Ceramic ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Conduction Properties

The dielectric response and electrical conduction of Lu3NbO7 transparent ceramic produced by spark plasma sintering were investigated. Lu3NbO7 transparent ceramic exhibited low frequency dielectric dispersion and a peak in dielectric loss, shifting to higher frequency at high temperatures. This indicated space charge polarization and broad relaxation time, confirmed by impedance and modulus spectra. The Nyquist plot shows the dominant grain effect in the electrical conduction. The AC conductivity of Lu3NbO7 transparent ceramic is 4.18×10-2 S m-1 at 1073 K, with an activation energy of 1.30 eV.

Influence of Nb2O5 doping to energy-storage properties of (Na0.5Bi0.5)0.705Ba0.045Sr0.25TiO3 lead-free ferroelectric ceramics

2021 ◽  
Vol 573 (1) ◽  
pp. 246-255
Author(s):  
Ruifang Wu ◽  
Linlin Liang ◽  
Ruijie Duan ◽  
Jinghao Zhao ◽  
Zekai Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Lead Free ◽  
Ferroelectric Ceramics ◽  
Energy Storage Properties ◽  
Storage Properties
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