Synthesis, Characterization and Electrical Properties of Barium Titanate Films Fabricated by Hydrothermal Method

2008 ◽  
Vol 368-372 ◽  
pp. 47-49
Author(s):  
Jian Ling Zhao ◽  
Xiao Hui Wang ◽  
Long Tu Li ◽  
Xi Xin Wang ◽  
Yang Xian Li
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Barium Titanate ◽  
Loss Tangent ◽  
Coercive Field ◽  
Remanent Polarization ◽  
Hydrothermal Conditions ◽  
Batio3 Film ◽  
Maximum Value ◽  
Dielectric Constant And Loss

BaTiO3 films with a thickness up to 3 μm were fabricated under the hydrothermal conditions. It was found that the crystallinity of BaTiO3 increases with the concentration of Ba(OH)2 solutions. Along with the increasing of time, the crystallinity of BaTiO3 increases, reaches the maximum value and then decreases. The measured values of remanent polarization (Pr) and coercive field (Ec) are 1.74μC/cm2 and 24KV/cm. The leakage of the films at 1V is 10-7A/cm2. The dielectric constant and loss tangent of hydrothermal derived BaTiO3 film at a frequency of 1 KHz were 600 and 0.2, respectively.

scholarly journals Electrical Properties of Sunflower Achenes

2014 ◽  
Vol 17 (4) ◽  
pp. 109-113 ◽  
Author(s):  
Ján Novák ◽  
Ivan Vitázek
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Moisture Content ◽  
Electric Field ◽  
Loss Tangent ◽  
Dielectric Heating ◽  
Electrical Measurements ◽  
Engineering Research ◽  
Dielectric Constant And Loss ◽  
Properties Of Materials

Abstract This work contains the results of measuring the electrical properties of sunflower achenes. The interest in electrical properties of biological materials resulted in engineering research in this field. The results of measurements are used for determining the moisture content, the surface level of liquid and grainy materials, for controlling the presence of pests in grain storage, for the quantitative determination of mechanical damage, in the application of dielectric heating, and in many other areas. Electrical measurements of these materials are of fundamental importance in relation to the analysis of quantity of absorbed water and dielectric heating characteristics. It is a well-known fact that electrical properties of materials, namely dielectric constant and conductivity, are affected by the moisture content of material. This fact is important for the design of many commercial moisturetesting instruments for agricultural products. The knowledge of dielectric properties of materials is necessary for the application of dielectric heating. The aim of this work was to measure conductivity, dielectric constant and loss tangent on samples of sunflower achenes, the electrical properties of which had not been sufficiently measured. Measurements were performed under variable moisture content and the frequency of electric field ranging from 1 MHz to 16 MHz, using a Q meter with coaxial probe. It was concluded that conductivity, dielectric constant and loss tangent increased with increasing moisture content, and dielectric constant and loss tangent decreased as the frequency of electric field increased.

scholarly journals Electric Properties Measurement of Lentil

2018 ◽  
Vol 21 (1) ◽  
pp. 18-23
Author(s):  
Ján Novák
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Moisture Content ◽  
Electric Field ◽  
Loss Tangent ◽  
Electric Properties ◽  
Dielectric Heating ◽  
Moisture Contents ◽  
Dielectric Constant And Loss ◽  
Coaxial Probe

AbstractThis paper contains the results of the electric properties measurement of lentil set. Electric measurements with use of these materials are of fundamental importance in relation to the analysis of quantity of absorbed water and dielectric heating characteristics. The aim of this paper was to perform the measurements of conductivity, dielectric constant and loss tangent on samples of lentil, the electrical properties of which had not been sufficiently measured. Measurements were performed under various moisture contents, and the frequency of electric field ranged from 1 MHz to 16 MHz, using a Q meter with coaxial probe. It was concluded that conductivity, relative permittivity and loss tangent increased with an increase in moisture content, and dielectric constant and loss tangent decreased as the frequency of electric field increased.

scholarly journals Electrical Prope Rties of Popcorn Grains

2013 ◽  
Vol 16 (2) ◽  
pp. 43-46
Author(s):  
Ján Novák
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Moisture Content ◽  
Electric Field ◽  
Loss Tangent ◽  
Dielectric Heating ◽  
Electrical Measurements ◽  
Engineering Research ◽  
Dielectric Constant And Loss ◽  
Properties Of Materials

Abstract This work contains the results of measuring the electrical properties of popcorn grains. Interest in electrical properties of biological materials resulted in engineering research in this field. The results of measurements are used for determining the moisture content, the surface level of liquid and grainy materials, for controlling the presence of pests in grain storage, for a quantitative determination of mechanical damage, in applications of dielectric heating, and in many other cases. Electrical measurements on these materials are of fundamental importance in relation to the analysis of quantity of absorbed water and dielectric heating characteristics. It is a well-known fact that electrical properties of materials, namely dielectric constant and conductivity, are affected by the moisture content of material. This fact is important for the design of many commercial moisture-testing instruments for agricultural products. The knowledge of dielectric properties of materials is necessary for the application of dielectric heating. The aim of this work was to perform the measurements of conductivity, dielectric constant and loss tangent on samples of popcorn grains, the electrical properties of which had not been sufficiently measured. Measurements were performed under variable moisture content and the frequency of electric field in the range from 1 MHz to 16 MHz, using a Q meter with a coaxial probe. It was concluded that conductivity, dielectric constant and loss tangent increased with increase of moisture content, and dielectric constant and loss factor decreased as the frequency of electric field increased.

CALCULATED DIELECTRIC PARAMETERS OF BARIUM TITANATE-LEAD ZIRCONATE COMPOSITES AS A FUNCTION OF COMPOSITION AND FREQUENCY

1990 ◽  
Vol 04 (06) ◽  
pp. 381-387
Author(s):  
S. K. SARKAR
Keyword(s):  
Dielectric Constant ◽  
Barium Titanate ◽  
Loss Tangent ◽  
Coercive Field ◽  
Dielectric Strength ◽  
Lead Zirconate ◽  
Connectivity Pattern ◽  
Dielectric Parameters ◽  
Saturation Polarization ◽  
Titanate Lead

Some dielectric parameters e.g. dielectric constant, resistivity, dielectric strength, saturation polarization, loss tangent and coercive field of barium titanate-lead zirconate composites have been calculated as a function of composition and frequency. Most of the dielectric parameters have been found to vary linearly with composition and frequency. A 3–0 connectivity pattern of the composites has been assumed in calculating the dielectric parameters.

scholarly journals CONDENSER STRUCTURES BASED ON BARIUM TITANATE FILMS FORMED BY SOL-GEL METHOD

Doklady BGUIR ◽  
2020 ◽  
pp. 74-80
Author(s):  
P. A. Kholov ◽  
N. V. Gaponenko ◽  
K. V. Shaidakova ◽  
V. I. Krymski ◽  
V. A. Filipenya ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Barium Titanate ◽  
Loss Tangent ◽  
Dielectric Loss Tangent ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Batio3 Film ◽  
Capacitance Voltage

The objective of the work is investigation the dielectric permittivity and dielectric loss tangent of BaTiO3 films in a capacitor structure formed by sol – gel method on a Si/TiOx/Pt substrate. The basis of this capacitor is a four-layer film of barium titanate xerogel with a thickness of about 200 nm. The film was synthesized by sol-gel method at a final annealing temperature 750 °C. The problems related to the development of method of forming multilayer capacitor structures, the analysis of the morphology and phase composition of BaTiO3 film, and also the measurement of the capacitance-voltage characteristics in the frequency range 10 kHz – 2 MHz have been solved. Morphology of the films was analyzed using a Hitachi S-4800 scanning electron microscope. X-ray diffraction spectra was recorded using a DRON-3 automated diffractometer, using monochromatic CuKα radiation. Capacitance-voltage characteristics were obtained using a B1500A semiconductor analyzer. Dielectric constant and dielectric loss tangent, calculated for capacitance measurements, are changed as follows: for a bias voltage of U = 0 V, the change in ε is 232–214, and tanδ 0.022–0.16, and for a bias voltage of U = 10 V, ε occurs in the range 135–124 and tanδ from 0.02 to 0.1. The obtained frequency dependences of the dielectric constant of BaTiO3 films show a decrease in the dielectric constant in the range of 10 kHz – 2 MHz. It was found that, with a BaTiO3 film thickness of less than 100 nm, a thin-film capacitor with a lower platinum electrode is not always formed, which is probably caused by shunting of the structure.

CALCULATED DIELECTRIC PARAMETERS OF BARIUM TITANATE-POTASSIUM TANTALATE COMPOSITES AS A FUNCTION OF COMPOSITION AND FREQUENCY

1990 ◽  
Vol 04 (13) ◽  
pp. 877-884
Author(s):  
S.K. SARKAR
Keyword(s):  
Dielectric Constant ◽  
Barium Titanate ◽  
Loss Tangent ◽  
Coercive Field ◽  
Strength Loss ◽  
Dielectric Strength ◽  
Simplified Model ◽  
Connectivity Pattern ◽  
Dielectric Parameters ◽  
Potassium Tantalate

Some dielectric parameters such as dielectric constant, resistivity, dielectric strength, loss tangent, saturation polarisation, coercive field of barium titanate-potassium tantalate composites have been calculated as a function of composition and frequency, assuming a very simplified model and a 3–0 connectivity pattern. Most of the parameters have been found to vary linearly with composition at a given frequency.

Dielectric Constant and Loss Tangent Characterization of Thin High-K Dielectrics Using Corner-to-Corner Plane Probing

2006 ◽  
Author(s):  
A. Ege Engin ◽  
Abdemanaf Tambawala ◽  
Madhavan Swaminathan ◽  
Swapan Bhattacharya ◽  
Pranabes Pramanik ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Loss Tangent ◽  
Dielectric Constant And Loss ◽  
High K

PREDICTION OF SHIELDING EFFECTIVENESS OF CEMENT-GRAPHITE POWDER USING ARTIFICIAL NEURAL NETWORK

2016 ◽  
Vol 78 (6-2) ◽  
Author(s):  
See Khee Yee ◽  
Samsul Haimi Dahlan ◽  
Mohd Zarar Mohd Jenu ◽  
Chee Kiong Sia
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Dielectric Constant ◽  
Loss Tangent ◽  
Analytical Calculation ◽  
Graphite Powder ◽  
Dielectric Measurement ◽  
Shielding Effectiveness ◽  
Dielectric Constant And Loss ◽  
Artificial Neural

This paper presents the method to predict the shielding effectiveness of cement powder mixed with different amount of graphite powder. Cement mixed with different percentage of graphite is prepared. Their dielectric constant and loss tangent are measured based on the transmission/reflection technique using APC7 connector. The measured data is fed into Artificial Neural Network (ANN) for training. When the training process is completed the neural network is used to predict the dielectric constant and loss tangent of cement-graphite mixture that contains different amount of graphite. The comparison shows that the trained neural network is very successful to predict the dielectric constant and loss tangent of cement-graphite mixture. The proposed graphical user interface has made the process of shielding effectiveness prediction becomes more user friendly especially for those designers who are not familiar with the analytical calculation of shielding effectiveness and dielectric measurement.

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