In—Line Measurement Of High Temperature Dielectric Constant In The Process Of Sintering

1996 ◽  
Vol 430 ◽  
Author(s):  
Zhou Jian ◽  
Cheng Jiping ◽  
Tang Yuling ◽  
Qiu Jinyu
Keyword(s):  
Dielectric Constant ◽  
High Temperature ◽  
Resonant Cavity ◽  
Ceramic Materials ◽  
Dielectric Constants ◽  
Experimental Results ◽  
Cavity Method ◽  
Experimental Basis ◽  
Ceramic Samples ◽  
Line Measurement

AbstractIn this paper, a resonant cavity method is developed and some experimental results for measuring dielectric constants of ceramic samples (e. g. Al2O3) under different sintering temperatures are reported. The experiments show that this method has higher precision and good prospects of in—line monitoring the high temperature dielectric constant in the process of raising the temperature of the samples. These results provide some scientific experimental basis for physical research of ceramic materials.

scholarly journals Design of Substrate-Integrated Waveguide Loading Multiple Complementary Open Resonant Rings (CSRRs) for Dielectric Constant Measurement

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 857 ◽  
Author(s):  
Honggang Hao ◽  
Dexu Wang ◽  
Zhu Wang
Keyword(s):  
Dielectric Constant ◽  
Quality Factor ◽  
Ground Plane ◽  
Resonant Cavity ◽  
Frequency Offset ◽  
Dielectric Constants ◽  
Complex Dielectric Constant ◽  
Cavity Method ◽  
Substrate Integrated Waveguide ◽  
Wide Range

In order to solve the low-sensitivity problem of the dielectric constant with the resonant cavity method, a sensor based on a substrate-integrated waveguide structure loaded with a multi-complementary open resonant ring is proposed. With the enhanced resonance characteristics of the sensor, this design realized the measurement of complex dielectric constants in a wide range. The frequency selectivity of the sensor is improved by the high-quality factor of the substrate-integrated waveguide. By loading three complementary resonant rings with different opening directions in the ground plane, a deeper notch and better out-of-band suppression are achieved. The effect of the complex dielectric constant on both resonant frequency and quality factor is discussed by calculating the material under test with a known dielectric constant. Simulation and experimental results show that a resonance frequency offset of 102 MHz for the per unit dielectric constant is achieved. A wide frequency offset is the prerequisite for accurate measurement. The measurement results of four plates match well with the standard values, with a relative error of the real part of the dielectric constant of less than 2% and an error of less than 0.0099 for the imaginary part.

Microwave Equipment Considerations for High Temperature Studies in Ceramics

1988 ◽  
Vol 124 ◽  
Author(s):  
Martin Yonnone
Keyword(s):  
High Temperature ◽  
Microwave Heating ◽  
Microwave Field ◽  
Rapid Heating ◽  
Ceramic Materials ◽  
Microwave Energy ◽  
Ceramic Samples ◽  
Scientists And Engineers

The utilization of microwave energy as a source for the heating of ceramic materials is not a recent discovery. Notably, Von Hippel(1) and others including Tinga(2) investigated the microwave heating of ceramic materials in the 50's and 60's. Today, many microwave scientists and engineers are working on the complexities associated with the rapid heating exhibited by ceramic samples in the microwave field.

High Performance Porous Wave-Transmitting Silicon Nitride Ceramics by Gel-Casting Technique

2012 ◽  
Vol 512-515 ◽  
pp. 869-872 ◽  
Author(s):  
Jian Zhang ◽  
Ji Wei Chen ◽  
Hong Jie Wang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Flexural Strength ◽  
High Performance ◽  
Sintering Temperature ◽  
Resonant Cavity ◽  
Porous Ceramics ◽  
Cavity Method ◽  
Pore Former ◽  
Gel Casting

Porous wave transmitting Si3N4 ceramics have been of great interest and technological importance in aerospace area. In this paper, the high performance wave transmitting porous Si3N4 ceramics was prepared by gel-casting method, without any pore-former. The porosity was controlled by the solid content of the slurry and the sintering temperature. The flexural strength and dielectric properties of the material were determined by three bending method and a resonant cavity method. The relationship of the dielectric constant versus the sintering temperature was discussed, and the effect of porosity on dielectric properties was investigated also. As a result, the flexural strength of the porous Si3N4 is 40-200MPa with porosity of 67-45%, dielectric constant of 2.2-3.4 in the frequency of 8GHz at room temperature. With the increase of porosity, both the dielectric constant and dielectric loss decreased. This technique is considered to be a potentially useful method to fabricate the porous ceramics with complex shape.

High Temperature Dielectric Constants of Rubidium Halides

1972 ◽  
Vol 50 (10) ◽  
pp. 1053-1054 ◽  
Author(s):  
Suresh Chandra ◽  
Jai Prakash
Keyword(s):  
Dielectric Constant ◽  
High Temperature ◽  
Melting Point ◽  
Standing Wave ◽  
Room Temperature ◽  
Dielectric Constants ◽  
Wave Technique

The high temperature dielectric constants of RbCl, RbBr, and RbI are measured at 24.6 GHz from room temperature to near melting point. A standing wave technique has been used. The dielectric constant of RbBr is observed to increase at a faster rate than that of RbCl and RbI.

scholarly journals Synthesis of Superheat-Resistant Polyimides with Enhanced Dielectric Constant by Introduction of Cu(ΙΙ)-Coordination

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 442
Author(s):  
Guangtao Qian ◽  
Mengjie Hu ◽  
Shangying Zhang ◽  
Mengxia Wang ◽  
Chunhai Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Dielectric Constant ◽  
Glass Transition ◽  
High Temperature ◽  
High Performance ◽  
Dielectric Constants ◽  
Thermal And Mechanical Properties ◽  
Glass Transition Temperatures ◽  
Enhanced Properties

To achieve polyimide-metal complexes with enhanced properties, 5-amine-2-(5-aminopyridin-2-yl)-1-methyl-benzimidazole (PyMePABZ) that contains stiff 2-(2′-pyridyl)benzimidazole (PyBI) was synthesized and exploited to construct the Cu(ΙΙ)-crosslinked polyimides (Cu-PIs). These Cu-PIs exhibited higher dielectric, thermal, and mechanical properties with an increase in Cu2+ content. Among them, their dielectric constants (εrS) were up to 43% superior to that of the neat PI, glass transition temperatures (Tgs) were all over 400 °C, and 5% weight loss temperature (T5%) maintained beyond 500 °C. These data indicate that the metal coordination crosslinking provided a useful guide to develop high performance PIs which possess potential application as useful high temperature capacitors.

scholarly journals Measurement of Dielectric and Magnetic Constants of Ferrofluid-Doped Sol-Gels by a Resonant Cavity Method

2021 ◽  
pp. 29-36
Author(s):  
B. Mahamout Mahamat ◽  
O. B. Arafat ◽  
B. Sauviac ◽  
M. F. Blanc-Mignon ◽  
S. Neveu ◽  
...  
Keyword(s):  
Volume Concentration ◽  
Sol Gel ◽  
Resonant Cavity ◽  
Dielectric Constants ◽  
Electromagnetic Properties ◽  
Cavity Method ◽  
Passive Components ◽  
Materials Properties ◽  
The Matrix

Materials with specific electromagnetic properties are increasingly used for the realization of passive components. Therefore, electromagnetic characterization is a priority to know these materials properties. This study focuses on the electromagnetic characterization of 10 nm maghemite ferrofluid doped sol-gel using a resonant cavity method. We deposited the sol-gel by dipping/removal on an alumina substrate in order to make measurements on the cavity to determine the complex permittivity and permeability. Two studies were carried out; the first consisted in varying the doped sol-gel thickness of layers of the same concentration in the realization of samples; and the second consisted in varying the volume concentration of ferrofluid according to the matrix dimensions. The first study showed that the dielectric constants do not vary with the thickness of the magnetic sol-gel layers. In the second study, measurements also showed that the gyromagnetic resonance is the same for all samples regardless of the ferrofluid volume concentration.

Dielectric Properties of Phosphate Glasses in the Region from 1 to 10 GHz

2006 ◽  
Vol 320 ◽  
pp. 209-212 ◽  
Author(s):  
Shigeru Fujino ◽  
Makoto Kuwabara
Keyword(s):  
Dielectric Constant ◽  
Frequency Region ◽  
Phosphate Glasses ◽  
Dielectric Constants ◽  
Tangent Loss ◽  
Cavity Method ◽  
Compositional Dependence ◽  
Silica Network ◽  
Coordination Numbers ◽  
Resonance Cavity

Dielectric constants were measured for phosphate and silica glass systems in the frequency region of 1 to 10 GHz using the resonance cavity method. Compositional dependence of dielectric constant and tangent loss were discussed. The effect of the cations on the ε indicates that ε increases in the order, R:Mg <Zn<Ca<Sr<Ba and thus depends upon the ionic radius. The effects of Mg and Zn cations on the refractive index and dielectric constant were different from those of Ba,Sr, and Ca cations, that is Mg2+ and Zn2+ have coordination numbers of about 4 and would partially play a role similar to a silica- network in phosphate glasses.

Dielectric Properties of Y3+-Doped Ba0.62Sr0.38TiO3 Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 51-53
Author(s):  
Yuan Liang Li ◽  
Yuan Fang Qu ◽  
Feng Long Han ◽  
Chao Liu ◽  
Xiao Yan Li
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Room Temperature ◽  
Dielectric Constants ◽  
Experimental Results ◽  
Dielectric Losses ◽  
Accelerate Growth ◽  
In The Beginning

Microstructure and dielectric properties of Ba0.62Sr0.38TiO3 ceramics doped with x mol% (x=0.2~0.6) Y2O3 were investigated. SEM showed that Y3+ can accelerate growth of the grains at first, then turn to inhabit growth of the grains with further addition of Y3+ above 0.8mol%. The experimental results showed that the dielectric constants were improved with the additive amount of Y3+ increasing, if the amount of Y3+ increased continuously, the dielectric constants will drop, whereas the dielectric losses of the samples descended rapidly in the beginning, then went up obviously with further addition of Y3+ above 1.0mol%, the optimal dielectric constant and dielectric loss could reach 6700 and 0.0015 in the room temperature, respectively.

GENERATION AND PROPERTIES OF INFRARED RADIATION

2019 ◽  
Vol 6 (2) ◽  
pp. 101-137
Author(s):  
RUSTAM KHAKIMOVICH RAKHIMOV
Keyword(s):  
Electromagnetic Radiation ◽  
Infrared Radiation ◽  
Radiation Spectrum ◽  
Laws Of Nature ◽  
Primary Source ◽  
Ceramic Materials ◽  
Experimental Results ◽  
Ir Radiation ◽  
Scattering Of Light

The article presents the main basic laws of nature and modern theories of the nature of electromagnetic radiation, its generation, characteristics, and laws of reflection, absorption and scattering of light. The principle of transformation of the radiation spectrum of the primary source using the developed ceramic materials are shown, as well as experimental results of the interaction of IR radiation with matter and various mechanisms of influence on various objects and processes are described.

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