Study of dielectric behavior and conductivity formalism of modified calcium copper titanate ceramic

2020 ◽  
Author(s):  
Agam Rani ◽  
N. Ahlawat ◽  
R. S. Kundu ◽  
Vinay Pratap Singh
Keyword(s):  
Dielectric Behavior ◽  
Calcium Copper Titanate ◽  
Titanate Ceramic

Effect of simultaneous substitution of La and Mn on dielectric behavior of barium titanate ceramic

2007 ◽  
Vol 42 (14) ◽  
pp. 5490-5496 ◽  
Author(s):  
Om Parkash ◽  
Devendra Kumar ◽  
R. K. Dwivedi ◽  
K. K. Srivastava ◽  
Prakash Singh ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Dielectric Behavior ◽  
Barium Titanate Ceramic ◽  
Simultaneous Substitution ◽  
Titanate Ceramic

EFFECT OF Co3O4 NANOPARTICLE ON THE PROPERTY OF BARIUM TITANATE CERAMIC

2011 ◽  
Vol 01 (02) ◽  
pp. 229-235 ◽  
Author(s):  
W. C. VITTAYAKORN ◽  
D. BUNJONG ◽  
A. RUANGPHANIT ◽  
N. VITTAYAKORN
Keyword(s):  
Barium Titanate ◽  
Dielectric Behavior ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Cell Parameters ◽  
Fine Grain ◽  
Barium Titanate Ceramic ◽  
Lower Temperature ◽  
Titanate Ceramics ◽  
Titanate Ceramic

Effects of the Co3O4 nanoparticle on the phase formation, microstructure and dielectric properties of barium titanate ceramics are investigated in this study. Co3O4 -doped BaTiO3 ceramics were prepared by the conventional mixed oxide method followed by normal sintering in air. Systematic studies of X-ray diffraction (XRD), scanning electron microscopy and dielectric spectroscopy with varying doping levels were performed. The cell parameters, tetragonality and crystallite size of doped ceramics also were calculated from XRD data. Results showed that the single phase of BaTiO3 gave no evidence of unwanted peak forms in any of the samples. Cubic phase occurred after adding Co3O4 at 0.25 mol%. Various grain sizes and shapes were found in this system. Finally, adding Co3O4 in BaTiO3 ceramics resulted in shifting of the Curie point to a lower temperature. The composition, x = 0.25, showed different dielectric behavior, which related to appearance of the cubic phase and fine grain microstructure.

Effect of samarium doping on the dielectric behavior of barium zircomium titanate ceramic

2014 ◽  
Author(s):  
T. Badapanda ◽  
S. Sarangi ◽  
B. Behera ◽  
S. Anwar ◽  
T. P. Sinha
Keyword(s):  
Dielectric Behavior ◽  
Titanate Ceramic

Dielectric behavior of barium modified strontium bismuth titanate ceramic

2014 ◽  
Author(s):  
P. Nayak ◽  
T. Badapanda ◽  
S. Anwar ◽  
S. Panigrahi
Keyword(s):  
Bismuth Titanate ◽  
Dielectric Behavior ◽  
Titanate Ceramic

Influence of Slight Bismuth Additive on the Properties of Calcium Copper Titanate Ceramic

2010 ◽  
Vol 105-106 ◽  
pp. 274-277 ◽  
Author(s):  
Feng Chao Luo ◽  
Jin Liang He ◽  
Jun Hu ◽  
Yuan Hua Lin
Keyword(s):  
Dielectric Constant ◽  
Grain Size ◽  
Potential Barrier ◽  
Calcium Ions ◽  
Relative Dielectric Constant ◽  
Second Phase ◽  
Impedance Measurements ◽  
Calcium Copper Titanate ◽  
Slight Amount ◽  
Titanate Ceramic

The CaCu3Ti4O12 samples with slight amount of doped bismuth were prepared and tested in this research. No second phase with bismuth was found in the doped samples. It was inferred that the bismuth ions has entered the lattice and take the place of the calcium ions. The grain size was diminished with the increase of the bismuth content. The bismuth atoms can inhibit the grains from growing large, and it could be used to modify the microstructure of CaCu3Ti4O12 ceramic. The reduction of the grain size resulted in the decrease of the relative dielectric constant, according to the “internal barrier layer capacitance (IBLC)” theory. The impedance measurements showed that the doped samples have less conductivity and lower potential barrier at the grain boundaries, and the substitution of the bismuth ions on the calcium cites might be the reason for it. As a result of the lowered potential barrier, the non-ohmic I-V property of the CaCu3Ti4O12 ceramic almost disappears in the doped ones.

Tuning the Electric Field Response of MOFs by Rotatable Dipolar Linkers

2019 ◽  
Author(s):  
Johannes P. Dürholt ◽  
Babak Farhadi Jahromi ◽  
Rochus Schmid
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Structural Changes ◽  
Dielectric Behavior ◽  
Two Dimensions ◽  
Dielectric Constants ◽  
Electric Response ◽  
Dipole Strength ◽  
Metal Organic ◽  
Dynamics Simulations

Recently the possibility of using electric fields as a further stimulus to trigger structural changes in metal-organic frameworks (MOFs) has been investigated. In general, rotatable groups or other types of mechanical motion can be driven by electric fields. In this study we demonstrate how the electric response of MOFs can be tuned by adding rotatable dipolar linkers, generating a material that exhibits paralectric behavior in two dimensions and dielectric behavior in one dimension. The suitability of four different methods to compute the relative permittivity κ by means of molecular dynamics simulations was validated. The dependency of the permittivity on temperature T and dipole strength μ was determined. It was found that the herein investigated systems exhibit a high degree of tunability and substantially larger dielectric constants as expected for MOFs in general. The temperature dependency of κ obeys the Curie-Weiss law. In addition, the influence of dipolar linkers on the electric field induced breathing behavior was investigated. With increasing dipole moment, lower field strength are required to trigger the contraction. These investigations set the stage for an application of such systems as dielectric sensors, order-disorder ferroelectrics or any scenario where movable dipolar fragments respond to external electric fields.

Influence of Ca-Doping on Structural, Magnetic and Dielectric Properties of Ba3Co2-xCaxFe24O41 Hexaferrite Powders

2015 ◽  
Vol 241 ◽  
pp. 226-236 ◽  
Author(s):  
Neha Solanki ◽  
Rajshree B. Jotania
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Sol Gel ◽  
Calcium Content ◽  
Combustion Method ◽  
Dielectric Behavior ◽  
Dielectric Parameters ◽  
Ca Doping ◽  
Auto Combustion ◽  
Magnetic And Dielectric Properties

Influence of Ca substitution on structural, magnetic and dielectric properties of Ba3Co2-xCaxFe24O41(where x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), prepared by Sol-Gel auto-combustion method, has been investigated in present studies. The obtained powder was sintered at 950 oC for 4 hrs. in the static air atmosphere. Structural analysis of Ca-doped Ba3Co2-xCaxFe24O41powders revealed pure Z-type hexaferrite phase at low temperature. The frequency dependent dielectric constant (Єʹ) and magnetic properties such as remanent magnetization (Mr), saturation magnetization (Ms) and coercivity (Hc) were studied. It is observed that coercivity increased gradually with increase in calcium content. The real dielectric constant (Єʹ) and dielectric loss tangent (tan δ) were studied in the frequency range of 20Hz to 2MHz. The dielectric parameters for all samples show normal dielectric behavior as observed in hexaferrites. Contents of Paper

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