High Temperature Dielectric Measurements on Ceramics

1992 ◽  
Vol 269 ◽  
Author(s):  
M Aral ◽  
J G P Binner ◽  
G E Carr ◽  
T E Cross
Keyword(s):  
High Temperature ◽  
Dielectric Properties ◽  
Alternative Energy ◽  
Elevated Temperatures ◽  
Microwave Dielectric Properties ◽  
Microwave Frequency ◽  
Dielectric Measurements ◽  
Microwave Dielectric ◽  
The University ◽  
Processing Group

ABSTRACTThe use of microwave frequency radiation as an alternative energy source for processing materials is currently receiving considerable worldwide attention. The ability of a material to extract energy from the microwave field depends upon its dielectric properties, however these change as the material heats. There is, therefore, a need for obtaining measurements of the microwave dielectric properties at elevated temperatures. This paper outlines some of the current work on high temperature dielectric measurements which is in progress at the University of Nottingham as part of the Materials and Microwave Processing Group initiative and some results on engineering ceramics are presented.

Influences of MnCO3 Doping on Processing Parameters and Dielectric Properties of ZnNb2O6 Microwave Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 23-26
Author(s):  
J. Luo ◽  
Z.Y. Pang ◽  
Y.S. Lin ◽  
Zhao Xian Xiong
Keyword(s):  
Dielectric Properties ◽  
Ceramic Body ◽  
Microwave Dielectric Properties ◽  
Microwave Frequency ◽  
Solid State Reaction Method ◽  
Processing Parameters ◽  
Microwave Ceramics ◽  
Conventional Solid State Reaction ◽  
Microwave Dielectric ◽  
Ceramic Microstructure

MnCO3 was added into ZnNb2O6 ceramics to obtain excellent microwave dielectric properties. The samples were prepared by conventional solid-state reaction method. The effects of the amount of MnCO3 on sintering temperatures, ceramic densities and contraction were systematically investigated. The crystalline structure of ceramic body was analyzed by XRD. The ceramic microstructure was observed by SEM. The dielectric properties of ZnNb2O6 ceramics were measured by a vector network analyzer at microwave frequency, which showed: er = 22.65, Q×f = 36700 GHz (loaded value) and tf = -40 ppm/°C.

High-Temperature Microwave Dielectric Properties and Processing of JSC-1AC Lunar Simulant

2013 ◽  
Vol 26 (4) ◽  
pp. 874-881 ◽  
Author(s):  
Shawn M. Allan ◽  
Brandon J. Merritt ◽  
Brittany F. Griffin ◽  
Paul E. Hintze ◽  
Holly S. Shulman
Keyword(s):  
High Temperature ◽  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric ◽  
Lunar Simulant

scholarly journals Effect of Ammonium Sulphate on Dielectric Properties of Soil AT X & J-Band Microwave Frequency

2019 ◽  
Vol 8 (4) ◽  
pp. 64-67
Keyword(s):  
Dielectric Properties ◽  
Ammonium Sulphate ◽  
Microwave Dielectric Properties ◽  
Microwave Frequency ◽  
Soil Samples ◽  
Agricultural Product ◽  
Microwave Frequencies ◽  
Microwave Dielectric ◽  
Sample Method ◽  
Properties Of Soil

Microwave play important role in the moisture detection of soil plant and other agricultural product. In present paper the study of effect of ammonium sulphate on microwave dielectric properties of soil is presented. For this three soil samples were collected from different geographical region of Maharashtra. The infinite sample method was employed for the determination of storage factor (ε’) and loss factor (ε”) of the soils. In this paper the effect of ammonium sulphate on dielectric properties of soil when X and J-band microwave frequencies incident on it is discussed. The variation in values of dielectric properties of these soil samples mixed with different chemical contents are then measured at frequency 6 GHz and 9.86 GHz. The concentrations of this chemical in the soil samples are increased from 0 to 12 % and results are presented.

Dielectric Properties of Li2MgTiO4 Ceramic System at Microwave Frequency

2013 ◽  
Vol 538 ◽  
pp. 246-249 ◽  
Author(s):  
Guo Guang Yao ◽  
Hong Ma ◽  
Xiu Lao Tian
Keyword(s):  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Microwave Frequency ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Microwave Dielectric ◽  
Salt Structure ◽  
Microscopy Techniques ◽  
Sintering Method ◽  
Structure And Microstructure

The rock-salt structure Li2MgTiO4 ceramics were prepared by reaction sintering method and its microwave dielectric properties were investigated. The crystal structure and microstructure were analyzed using X-ray diffraction and scanning electron microscopy techniques. XRD showed that main phase Li2MgTiO4 combined with minor second phase Mg2TiO4 were formed after 1250-1350 oC sintering. The microwave dielectric properties of Li2MgTiO4 ceramics exhibited a significant depend on the density and to some extent on the morphology of the grains. Li2MgTiO4 sintered at 1325 oC/5h exhibits microwave dielectric properties of εr=13.2, Q×f=44 711 GHz (at 9.9 GHz ) and τf=-31ppm/oC.

Preparation and Microwave Dielectric Properties of (1-x)Ca2/5Sm2/5TiO3 -x Li1/2Nd1/2TiO3 Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 293-296
Author(s):  
Guo Hua Huang ◽  
Qing Lian Xie ◽  
Jian Mei Xu ◽  
Yin Song Pan ◽  
Dong Xiang Zhou
Keyword(s):  
Dielectric Properties ◽  
Citric Acid ◽  
Low Temperature ◽  
Ethylenediaminetetraacetic Acid ◽  
Microwave Dielectric Properties ◽  
Microwave Frequency ◽  
Microwave Properties ◽  
Soft Chemistry ◽  
Microwave Dielectric ◽  
Acid Gel

(1-x) Ca2/5Sm2/5TiO3-x Li1/2Nd1/2TiO3 (CSLNT) ceramics, suitable for use in resonators or filters at microwave frequency, have a high εr and a low temperature coefficient of resonant frequency. The effects of calcinations on the microwave dielectric properties of CSLNT were studied. The CSLNT (x = 0.3) ceramics sintered at 1300oC for 3 h showed microwave properties with εr of 92, Qf of 5060 GHz and τf of 7.5 ppm/oC. The microwave dielectric properties of CSLNT (x = 0.3) ceramics were also improved by soft chemistry methods such as citric acid gel route and ethylenediaminetetraacetic acid (EDTA) chelating method. The excellent microwave properties with εr = 96, Qf = 6290 GHz and τf = 6 ppm/oC were obtained by EDTA chelating method for CSLNT (x = 0.3) ceramics.

scholarly journals Preparation, crystal structure, and dielectric characterization of Li2W2O7 ceramic at RF and microwave frequency range

2017 ◽  
Vol 07 (01) ◽  
pp. 1720001 ◽  
Author(s):  
Jinwu Chen ◽  
Chunchun Li ◽  
Dan Wang ◽  
Huaicheng Xiang ◽  
Liang Fang
Keyword(s):  
Dielectric Properties ◽  
Single Phase ◽  
Microwave Dielectric Properties ◽  
Microwave Frequency ◽  
Solid State Reaction Method ◽  
Frequency Range ◽  
Conventional Solid State Reaction ◽  
Dielectric Characterization ◽  
Microwave Dielectric

Single phase Li2W2O7 with anorthic structure was prepared by the conventional solid-state reaction method at 550[Formula: see text]C and the anorthic structure was stable up to 660[Formula: see text]C. The dielectric properties at radio frequency (RF) and microwave frequency range were characterized. The sample sintered at 640[Formula: see text]C exhibited the optimum microwave dielectric properties with a relative permittivity of 12.2, a quality factor value of 17,700[Formula: see text]GHz (at 9.8[Formula: see text]GHz), and a temperature coefficient of the resonant frequency of [Formula: see text]232[Formula: see text]ppm/[Formula: see text]C as well as a high relative density [Formula: see text]94.1%. Chemical compatibility measurement indicated Li2W2O7 did not react with aluminum electrodes when sintered at 640[Formula: see text]C for 4[Formula: see text]h.

scholarly journals Complex dielectric modulus and relaxation response at low microwave frequency region of dielectric ceramic Ba6-3xNd8+2xTi18O54

2014 ◽  
Vol 04 (04) ◽  
pp. 1450034 ◽  
Author(s):  
Chian Heng Lee ◽  
Jumiah Hassan ◽  
Mansor Hashim ◽  
Raba'ah Syahidah Aziz ◽  
Norlaily Mohd Saiden
Keyword(s):  
Dielectric Properties ◽  
High Dielectric Constant ◽  
Microwave Dielectric Properties ◽  
Microwave Frequency ◽  
Dielectric Measurement ◽  
Low Loss ◽  
Dielectric Ceramic ◽  
Microwave Dielectric ◽  
Dielectric Modulus ◽  
High Dielectric

The desirable characteristics of Ba 6-3x Nd 8+2x Ti 18 O 54 include high dielectric constant, low loss tangent, and high quality factor developed a new field for electronic applications. The microwave dielectric properties of Ba 6-3x Nd 8+2x Ti 18 O 54, with x = 0.15 ceramics at different sintering temperatures (600–1300°C) were investigated. The phenomenon of polarization produced by the applied electric field was studied. The dielectric properties with respect to frequency from 1 MHz to 1.5 GHz were measured using Impedance Analyzer, and the results were compared and analyzed. The highest dielectric permittivity and lowest loss factor were defined among the samples. The complex dielectric modulus was evaluated from the measured parameters of dielectric measurement in the same frequency range, and used to differentiate the contribution of grain and grain boundary.

Sign in / Sign up

Export Citation Format

Share Document