Physical Properties: Dielectric Properties

2008 ◽  
pp. 231-252 ◽  
Author(s):  
David Dunmur ◽  
Kazuhisa Toriyama
Keyword(s):  
Dielectric Properties ◽  
Physical Properties

Polymethyl Methacrylate Binder Removal from an Alumina Compact: Microwave Versus Conventional Heating

1992 ◽  
Vol 269 ◽  
Author(s):  
Edmund H. Moore ◽  
David E. Clark ◽  
Ronald Hutcheon
Keyword(s):  
Thermal Decomposition ◽  
Dielectric Properties ◽  
Physical Properties ◽  
Polymethyl Methacrylate ◽  
Electric Furnace ◽  
Microwave Field ◽  
Conventional Heating ◽  
Microwave Cavity ◽  
Polymeric Binder ◽  
Binder Removal

ABSTRACTCompact samples of alumina and polymethyl methacrylate have been heated in a 2.45 GHz microwave cavity and by conventional heating in an electric furnace. Various heating schedules have been used to effect the removal of the polymeric binder by thermal decomposition. Dielectric properties, porosity and other physical properties have been investigated in order to better understand the binder removal process in a microwave field. Results of the study emphasize the amount of carbon residuals remaining in the bulk.

Synthesis and Dielectric Properties of [(K0.5Na0.5)0.935Li0.065]NbO3 Added with Mn for Piezoelectric Ceramic

2016 ◽  
Vol 675-676 ◽  
pp. 635-638
Author(s):  
Jukkrit Kongphimai ◽  
Hassakorn Wattanasarn ◽  
Tosawat Seetawan
Keyword(s):  
Crystal Structure ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Physical Properties ◽  
Crystallite Size ◽  
Piezoelectric Ceramic ◽  
Theoretical Density ◽  
Milling Method ◽  
Xrd Patterns

[(K0.5Na0.5 )0.935Li0.065]NbO3–Mn ceramics (Mn = 0, 1.50 and 3 mol %) (KNNL–Mn) were synthesized and measured dielectric properties. Which the K2CO3, Na2CO3, Li2CO3, Nb2O5 and MnO2 (0, 1.5, 3 mol%) were mixed by ball milling method and calcined powders at 1,073 K for 4 h and the sintered at 1,343 K for 2 h in air. The crystal structure was analyzed by XRD technique, the crystallite size was identified by Scherrer’s equation and calculated the theoretical density. It was found that, the XRD patterns of the KNNL–Mn ceramics added with Mn contents was indicated the tetragonal structure and. the crystallite size of Mn = 0, 1.50 and 3 mol% about 32 nm, 34 nm and 57 nm, respectively. The physical properties of the KNNL–Mn ceramics was found that the maximum theoretical density of 90.79 % for Mn = 1.50 mol%. The dielectric constant was found to be maximum of 909.77 and dielectric loss of 0.48 for Mn = 3 mol%.

Radiothermal radiation method for aqueous solutions

2021 ◽  
Author(s):  
L.A. Morozova ◽  
S.V. Savel’ev
Keyword(s):  
Dielectric Properties ◽  
Alkali Metal ◽  
Thermal Radiation ◽  
Aqueous Solutions ◽  
Physical Properties ◽  
Dielectric Constants ◽  
Water Molecules ◽  
Absorption Coefficients ◽  
Basic Substance ◽  
High Dilutions

For the first time, an ultra-high-sensitivity method for measuring radio-thermal radiation was developed and used in practice in order to establish the difference in the physical properties of aqueous solutions of substances in the millimeter region of the spectrum. The method is used to study the dynamics of the dielectric properties of aqueous solutions depending on the composition of the base substance and its concentration. The dynamics of dielectric properties establishes a one-to-one correspondence between the number and concentration of ions of the dissolved basic substance contained in water and the number of water molecules involved in cooperative interaction, which gives a consistent microscopic picture of ion-water cooperative interactions in the studied aqueous solutions of K2SO4 and Cs2SO4. The density of water molecules perturbed by the ions of the base substance contained in the hydration shell at normal concentrations is proportional to the number of ions, while the transition to weaker solutions leads to the creation of multilayer hydration shells. This means that the number of perturbed water molecules, depending on the number of ions, increases according to a law different from linear. In accordance with the experimental data, the values of the absorption coefficients of aqueous solutions were determined in a wide range of concentrations for alkali metal sulfates. It is noted that alkali metal sulfates have physical properties that generalize the dynamics of dielectric constants depending on the concentration of the base substance. A monotonic increase in the values of the absorption coefficients of solutions with a decrease in the concentration of basic substances in the region of high dilutions was established with individual dynamics for each basic substance, reflecting the total hydration changes in salt solutions. Research has shown that the proposed method for measuring radio-thermal radiation fixes a significant difference in the values of the dielectric constants of aqueous solutions at high dilutions from their values for water.

Reply by the author to J. Korringa and R. J. S. Brown

Geophysics ◽  
1984 ◽  
Vol 49 (2) ◽  
pp. 203-203
Author(s):  
James Lange
Keyword(s):  
Dielectric Properties ◽  
Theoretical Model ◽  
Physical Properties ◽  
Porous Materials ◽  
Experimental Model ◽  
Volume Fraction ◽  
Dielectric Material ◽  
Microscopic Structure ◽  
Dielectric Fluids ◽  
Insight Into

An important feature of the dielectric properties of water in porous materials is that it does not behave like many other dielectric fluids of simpler microscopic structure. As a basis for evaluating the deviance of the dielectric properties of water, an experimental model is used in my paper. This experimental model is the volume fraction model and is determined from direct measurement. It involves no theoretical suppositions about the geometry of the composite dielectric material. This approach is taken to illustrate the unique physical properties of water rather than to adopt some theoretical model which depends upon some extraordinary insight into the “approximate” geometry of the composite dielectrics.

Crystal structure and physical properties of Cr and Mn oxides with 3d3 electronic configuration and a K2NiF4-type structure

2015 ◽  
Vol 3 (14) ◽  
pp. 3452-3459 ◽  
Author(s):  
Ting-Hui Kao ◽  
Hiroya Sakurai ◽  
Taras Kolodiazhnyi ◽  
Yutaro Suzuki ◽  
Momoko Okabe ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Dielectric Properties ◽  
Physical Properties ◽  
Electronic Configuration ◽  
Type Structure ◽  
Magnetic And Dielectric Properties ◽  
Mn Oxides

YSrCrO4 is first synthesized. The magnetic and dielectric properties of YCaCrO4, LaSrCrO4 and A2MnO4 (A = Sr and Ca) are investigated together with YSrCrO4.

Preparation and Properties of a Novel Thermosetting Resin Based on 4,4'-Bismaleimidodiphenyl Methane and Allyl COPNA Resin

2012 ◽  
Vol 430-432 ◽  
pp. 24-27
Author(s):  
Lei Xiong ◽  
Qi Lang Lin
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Physical Properties ◽  
Rheological Properties ◽  
Thermosetting Resin ◽  
Resin System ◽  
Thermal Behaviors ◽  
Chemical Structures ◽  
Copna Resin ◽  
Thermo Stability

A bismaleimide (BMI) resin system based on allyl condensed polynuclear aromatic resin and 4,4'-bismaleimidodiphenyl methane was prepared in this paper. The chemical structures and rheological properties of the resin prepolymer were characterized by FTIR and viscometer, respectively. DSC was used to study the curing reaction of the resin prepolymer, and TG-DTG was employed to study the thermal behaviors of the cured resin. Moreover, physical properties of the BMI resin, including mechanical and dielectric properties, were studied. The results showed that the BMI resin had good thermo-stability, good mechanical properties and excellent dielectric properties. Introduction

Dielectric Properties and Microstructure of BaO-Nd2O3-Bi2O3-TiO2 Microwave Ceramics with Li2O-B2O3-SiO2

2014 ◽  
Vol 906 ◽  
pp. 12-17
Author(s):  
Yong Gang Zhang ◽  
Xiao Gang Wu
Keyword(s):  
Dielectric Properties ◽  
Low Temperature ◽  
Physical Properties ◽  
Sintering Temperature ◽  
Microwave Ceramics ◽  
Passive Components ◽  
Glass Composites ◽  
Ceramic Glass ◽  
Microwave Applications ◽  
Low Sintering Temperature

Low temperature co-fired ceramics (LTCC) technology becomes crucial in the development of various modules and substrates in electronic packaging, especially in wireless and microwave applications [. With this technology, passive components (such as capacitors and inductors) can be embedded into substrates, and co-fired with high-conductive metals (such as silver and copper) below 900°C. Therefore, the shringkage and dielectric properties of LTCC are of great importance to the performance of components. So far, ceramic/glass composites have been widely researched for LTCC application due to tailored physical properties and low sintering temperature [2-3].

Dielectric properties and reliability enhancement of atomic layer deposited thin films by in situ atomic layer substrate biasing

2020 ◽  
Vol 8 (37) ◽  
pp. 13025-13032
Author(s):  
Chun-Yi Chou ◽  
Teng-Jan Chang ◽  
Chin-I Wang ◽  
Chun-Yuan Wang ◽  
Yu-Tung Yin ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Properties ◽  
Physical Properties ◽  
Atomic Layer ◽  
Reliability Enhancement

The dielectric and physical properties of nanoscale thin films are significantly enhanced by atomic layer substrate biasing.

Effect of ZrO2 Doping in Physical Properties of Barium Iron Niobate Ceramics

2008 ◽  
Vol 55-57 ◽  
pp. 889-892 ◽  
Author(s):  
Uraiwan Intatha ◽  
Sukum Eitssayeam ◽  
Kamonpan Pengpat ◽  
Gobwute Rujijanagul ◽  
Tawee Tunkasiri
Keyword(s):  
Dielectric Properties ◽  
Solid State ◽  
Physical Properties ◽  
Cooling Rate ◽  
Single Phase ◽  
Phase Evolution ◽  
Optimum Conditions ◽  
Preparation Conditions ◽  
Heating And Cooling ◽  
Iron Niobate

In this work, preparation conditions and effect of ZrO2 doped BaFe0.5Nb0.5O3 ceramics were studied. Relationship between structure and dielectric properties was investigated. Single-phase cubic BFN powder was synthesized by solid-state reaction at 1200°C for 4 hours with heating and cooling rate of 5°C/min. Various amount of ZrO2 doped from 0.1 to 0.5 %weight were used for doping. After that BFN ceramics were formed via uniaxial pressing and sintered at 1300°C for 4 hours with heating and cooling rate of 5°C/min. Physical properties, microstructure, phase evolution and dielectric properties were studied to find out the optimum conditions for high voltage capacitor applications.

Sign in / Sign up

Export Citation Format

Share Document