scholarly journals Microwave assisted sol-gel synthesis of high dielectric constant CCTO and BFN ceramics for MLC applications

2017 ◽  
Vol 11 (2) ◽  
pp. 154-159 ◽  
Author(s):  
S Sonia ◽  
Mallam Chandrasekhar ◽  
Pawan Kumar
Keyword(s):  
Dielectric Constant ◽  
Sol Gel ◽  
Sharp Decrease ◽  
Ccto Ceramic ◽  
Microwave Assisted ◽  
Ceramic Samples ◽  
Microwave Furnace ◽  
High Dielectric ◽  
Sol Gel Synthesis ◽  
Sintering Processes

Ba(Fe1/2Nb1/2)O3 (BFN) and CaCu3Ti4O12 (CCTO) ceramic powders were synthesized by microwave assisted sol-gel synthesis technique and sintered at 1100?C and 1000?C, respectively. Calcination and sintering processes were carried out in a microwave furnace. Dielectric constant (?r)~2450 and dielectric loss (tan ?)~0.5 at frequency of 1 kHz and 20?C were observed for the BFN ceramic samples. Higher value of ?r ~ 3600 and lower value of tan ? ~ 0.07 at frequency of 1 kHz and in 20-60?C temperature range for the CCTO ceramic samples suggested its utility for MLC applications. Sharp decrease of ?r and sharp increase of tan ? at higher frequencies of BFN ceramic samples indicated the presence of Debye like relaxation.

Microwave-Assisted Synthesis of High Dielectric Constant CaCu3Ti4O12 from Sol–Gel Precursor

2015 ◽  
Vol 44 (7) ◽  
pp. 2243-2249 ◽  
Author(s):  
Xin Ouyang ◽  
Peng Cao ◽  
Saifang Huang ◽  
Weijun Zhang ◽  
Zhaohui Huang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Sol Gel ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
High Dielectric

Microstructure and Microwave Dielectric Properties of BaTi4O9 Ceramics Derived from a Sol-Gel Precursor

2011 ◽  
Vol 326 ◽  
pp. 127-130
Author(s):  
Xian Li Huang ◽  
Fu Ping Wang ◽  
Ying Song
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Sol Gel ◽  
Microwave Dielectric Properties ◽  
Sintering Process ◽  
Temperature Coefficients ◽  
Microwave Dielectric ◽  
Ceramic Samples ◽  
Quality Factor Q

In the present work, the microstructure and microwave dielectric properties of BaTi4O9 ceramics derived from a sol-gel precursor were presented. Density measuring results demonstrated that the largest densities of ceramic sample about 96.7% could be reached by virtue of a cool iso-static press and a sintering process at at 1300 °C for 6 hours. The dielectric constant (εr), quality factor (Q×f) and the temperature coefficients (τf) of the BaTi4O9 ceramic samples were 36.65, 28000 GHz, +20.2 ppm/°C, respectively. XRD, SEM and XPS were used to characterize the microstructure of the ceramics samples. Substantial Ti3+ was proposed to be the cause of dielectric loss.

Coupling Sol-Gel Synthesis and Microwave-Assisted Techniques: A New Route from Amorphous to Crystalline High-Surface-Area Aluminium Fluoride

2008 ◽  
Vol 14 (20) ◽  
pp. 6205-6212 ◽  
Author(s):  
Damien Dambournet ◽  
Gehan Eltanamy ◽  
Alexandre Vimont ◽  
Jean-Claude Lavalley ◽  
Jean-Michel Goupil ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Microwave Assisted ◽  
Aluminium Fluoride ◽  
Sol Gel Synthesis

Fabrication of barium titanate thin films with a high dielectric constant by a sol–gel technique

1999 ◽  
Vol 353 (1-2) ◽  
pp. 144-148 ◽  
Author(s):  
Hidehiro Kumazawa ◽  
Kazuaki Masuda
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Barium Titanate ◽  
High Dielectric Constant ◽  
Sol Gel ◽  
Gel Technique ◽  
High Dielectric

Microwave assisted sol–gel synthesis of tetragonal zirconia nanoparticles

2011 ◽  
Vol 509 (24) ◽  
pp. 6848-6851 ◽  
Author(s):  
Reena Dwivedi ◽  
Anjali Maurya ◽  
Akrati Verma ◽  
R. Prasad ◽  
K.S. Bartwal
Keyword(s):  
Sol Gel ◽  
Tetragonal Zirconia ◽  
Microwave Assisted ◽  
Sol Gel Synthesis ◽  
Zirconia Nanoparticles

scholarly journals Influence of trivalent rare earth (Dy3+) ions substitution on the structural, magnetic and dielectric properties of nanosized Ni0.6Cd0.4DyxFe2‒xO4 ferrites

2020 ◽  
Author(s):  
Hemant Kumar Dubey ◽  
Preeti Lahiri
Keyword(s):  
Dielectric Constant ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
Sem Images ◽  
Tem Analysis ◽  
Low Dielectric ◽  
Auto Combustion ◽  
Crystallite Sizes ◽  
High Dielectric

Abstract In the present work, Ni0.6Cd0.4DyxFe2‒xO4 (x = 0.0, 0.05, 0.10, 0.15 and 0.20) nanoparticles (NPs) were synthesized by using sol-gel auto combustion method. The structural characterization was performed by XRD, FTIR, SEM, TEM and EDS analyses. XRD patterns confirmed that the pure and dysprosium substituted Ni-Cd ferrites are in single phase spinel structures, while a trace of DyFeO3 appears as a minor phase for higher concentrations (x = 0.10, 0.15 and 0.20). The Debye‒Scherrer’s method and Williamson-Hall (W-H) method were used to evaluate the crystallite sizes and lattice strain. The average crystallite size was found to be in the range from 27 to 48 nm. FT-IR confirms the formation of spinel structure. SEM images show that reduction of grain size with Dy3+ content. Elemental composition features of samples were examined by EDS. The average particles size estimated from TEM analysis are in good agreement with results obtained from the XRD. The results showed that saturation magnetization (Ms) decreases and coercivity (Hc) increases with increase in Dy3+ concentrations. The dielectric constant and the loss tangent decrease rapidly with increasing frequency and then reaches a constant value, characteristic of normal behavior of ferrites. The dielectric constant was found to decrease with increasing Dy content in Ni-Cd ferrites. Ferrite sample with Dy3+ concentration, x = 0.05 show high dielectric constant, low dielectric loss and hence can be utilized in high frequency electrical circuits.

Synthesis and electrochemical characterization of electroactive IoNanofluids with high dielectric constants from hydrated ferrous sulphate

2019 ◽  
Vol 55 (1) ◽  
pp. 83-86 ◽  
Author(s):  
Aswathy Joseph ◽  
Marylin Mary Xavier ◽  
Jacek Fal ◽  
Gaweł Żyła ◽  
Soorya Sasi ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
High Stability ◽  
High Dielectric Constant ◽  
Ferrous Sulphate ◽  
Dielectric Constants ◽  
Microwave Assisted ◽  
Low Viscosity ◽  
One Step ◽  
High Dielectric

An iron oxide based-electroactive IoNanofluid with a high dielectric constant, high stability and low viscosity was synthesized from ferrous sulphate heptahydrate via a facile microwave assisted one-step route in 1-butyl-4-methylpyridinium chloride.

Sol–gel synthesized pure CaCu3Ti4O12 with very low dielectric loss and high dielectric constant

2015 ◽  
Vol 41 (10) ◽  
pp. 13486-13492 ◽  
Author(s):  
Li Sun ◽  
Zhenduo Wang ◽  
Yongjie Shi ◽  
Ensi Cao ◽  
Yongjia Zhang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
High Dielectric Constant ◽  
Sol Gel ◽  
Low Dielectric ◽  
High Dielectric
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