AC CONDUCTIVITY AND DIELECTRIC PROPERTIES OF MANGANESE DOPED LAYERED Na1.89Li0.10K0.01Ti3O7 CERAMICS

2013 ◽  
Vol 28 (01) ◽  
pp. 1350200
Author(s):  
SHRIPAL SHARMA ◽  
RAKESH SINGH ◽  
GEETIKA
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Chemical Synthesis ◽  
Loss Tangent ◽  
Relative Permittivity ◽  
Ac Electrical Conductivity ◽  
Conduction Mechanisms ◽  
Tan Δ ◽  
Electron Clouds ◽  
Derivatives Of

Manganese doped derivatives of polycrystalline Na 1.89 Li 0.10 K 0.01 Ti 3 O 7 bearing 0.01, 0.05 and 1.0 molar % of manganese have been prepared by chemical synthesis. The results of ac electrical conductivity studies in form of log (σT) versus 1000/T plots are reported in the frequency and temperature range of 10 kHz–1 MHz and 350–775 K, respectively. The corresponding plots have been divided into five temperature regions, I, II, III, IV and V. The various conduction mechanisms in different regions have been discussed. The nature of conductivity has been explained by proposing a model about the obtained conductivity σ(ω) which is the sum of three terms arising from three different mechanisms. Moreover, various Na–K–Li–O–Ti–O linkages in Na 2-x-y Li x K y Ti 3 O 7 materials may result special forms of electron clouds. Experimental results of the loss tangent ( tan δ) and relative permittivity (εr) versus temperature at different frequencies have been described. The results of tan δ and εr versus frequency plots at different temperature have also been given for these doped derivatives.

scholarly journals Investigation of dielectric properties of heterostructures based on ZnO structures

2018 ◽  
Vol 35 (4) ◽  
pp. 885-892
Author(s):  
A.H. Selçuk ◽  
E. Orhan ◽  
S. Bilge Ocak ◽  
A.B. Selçuk ◽  
U. Gökmen
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Frequency Dependence ◽  
Loss Tangent ◽  
Electrical Modulus ◽  
Ac Electrical Conductivity

Abstract The voltage and frequency dependence of dielectric constant є′, dielectric loss є″, electrical modulus M″, M′, loss tangent tanδ and AC electrical conductivity σAC of p-Si/ZnO/PMMA/Al, p-Si/ZnO/Al and p-Si/PMMA/Al structures have been investigated by means of experimental G-V and C-V measurements at 30 kHz, 100kHz, 500 kHz and 1 MHz in this work. While the values of є′, є″, tanδ and σAC decreased, the values of M′ and M″ increased for these structures when frequency was increased and those of p-Si/ZnO/Al and p-Si/PMMA/Al were comparable with those of p-Si/ZnO/PMMA/Al. The obtained results showed that the values of p-Si/ZnO/PMMA/Al structure were lower than the values of p-Si/ZnO/Al and p-Si/PMMA/Al.

scholarly journals Changes in Dielectric Properties and Dispersion Parameters of ZnO with Surfactant and Temperature

2020 ◽  
Vol 3 (10) ◽  
pp. 41-46
Author(s):  
P. P. Sharmila
Keyword(s):  
Zinc Oxide ◽  
Dielectric Properties ◽  
Loss Tangent ◽  
Structural Characterization ◽  
Complex Permittivity ◽  
Semiconductor Nanoparticles ◽  
Precipitation Method ◽  
Dispersion Parameters ◽  
Capping Agents ◽  
Tan Δ

The semiconductor nanoparticles have recently attracted a lot of attention due to the possibility of their application in various devices. In the present paper, nanoparticles of Zinc oxide are prepared by precipitation method using two different (EDTA and DNA) capping agents to control the agglomeration. XRD and SEM technique was used for structural characterization. For the study of dielectric properties, complex permittivity (ε′ and ε″) and loss tangent (tan δ) with frequency is analyzed with frequency and temperature. The Dispersion parameters are calculated using Cole-Cole analysis and the results are compared.

scholarly journals Novel Pressure Sensors Made from Nanocomposites (Biodegradable Polymers–Metal Oxide Nanoparticles): Fabrication and Characterization

2018 ◽  
Vol 63 (8) ◽  
pp. 754 ◽  
Author(s):  
A. Hashim ◽  
A. Hadi
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Low Cost ◽  
Metal Oxide Nanoparticles ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Oxide Nanoparticles ◽  
Ac Electrical Conductivity ◽  
Dc Electrical Conductivity ◽  
Pressure Sensitive

This paper aims to the preparation of novel pressure-sensitive nanocomposites with low cost, light weight, and good sensitivity. The nanocomposites of polyvinyl alcohol, polyacrylic acid, and lead oxide nanoparticles have been investigated. The dielectric properties and dc electrical conductivity of (PVA–PAA–PbO2) nanocomposites have been studied. The dielectric properties of nanocomposites were measured in the frequency range (100 Hz–5 MHz). The experimental results showed that the dielectric constant and dielectric loss of (PVA–PAA–PbO2) nanocomposites decrease, as the frequency increases, and they increase with the concentrations of PbO2 nanoparticles. The ac electrical conductivity of (PVA–PAA–PbO2) nanocomposites increases with the frequency and the concentrations of PbO2 nanoparticles. The dc electrical conductivity of (PVA–PAA–PbO2) nanocomposites also increases with the concentrations of PbO2 nanoparticles. The application of pressure-sensitive nanocomposites has been examined in the pressure interval (60–200) bar. The results showed that the electrical resistance of (PVA–PAA–PbO2) pressure-sensitive nanocomposites decreases, as the compressive stress increases. The (PVA–PAA–PbO2) nanocomposites have high sensitivity to pressure.

AC electrical conductivity and dielectric properties of doping induced molecular ferroelectric diisopropylammonium bromide

2019 ◽  
Vol 6 (9) ◽  
pp. 096306
Author(s):  
Ekramul Kabir ◽  
M Khatun ◽  
Raihan J Mustafa ◽  
Kiran Singh ◽  
Muklesur Rahman
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Ac Electrical Conductivity

Microwave Electromagnetic Characteristics of a Microcoiled Carbon Fibers/paraffin Wax Composite in Ku Band

2002 ◽  
Vol 17 (5) ◽  
pp. 1232-1236 ◽  
Author(s):  
Jin-Hong Du ◽  
Chao Sun ◽  
Shuo Bai ◽  
Ge Su ◽  
Zhe Ying ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Loss Tangent ◽  
Relative Permittivity ◽  
Magnetic Loss ◽  
Attenuation Factor ◽  
Paraffin Wax ◽  
The Real ◽  
Tan Δ ◽  
Factor Α ◽  
Ku Band

The complex relative permittivity ∈γ and permeability μγ of microcoiled carbon fibers (MCCFs) imbedded in paraffin wax were measured at Ku band frequencies (12.4–18 GHz). Both the real and imaginary parts of the complex relative permittivity of the MCCFs/paraffin wax composite decreased with increase of the frequency. The real part of the complex relative permeability of the composite increases with increase of the frequency, and the imaginary part is nonzero and nearly constant over the measured frequency range. The dielectric loss tangent (tan δ∈), the magnetic loss tangent (tan δm), and amplitude attenuation factor (α) were determined as well. On the basis of the experimental results, the MCCFs/paraffin wax composite is mainly a kind of dielectric lossy material with small magnetic loss and diamagnetism in the Ku band.

Sign in / Sign up

Export Citation Format

Share Document