scholarly journals Complex impedance spectra of polymer‐derived SiC annealed at ultrahigh temperature

2020 ◽  
Vol 103 (12) ◽  
pp. 6860-6868
Author(s):  
Yujun Jia ◽  
Md Atiqur Rahman Chowdhury ◽  
Chengying Xu
Keyword(s):  
Complex Impedance ◽  
Impedance Spectra ◽  
Ultrahigh Temperature ◽  
Complex Impedance Spectra

Impedance Analysis of Layer Structured NBT–CBT Mixed Ceramics

1998 ◽  
Vol 12 (11) ◽  
pp. 433-441 ◽  
Author(s):  
P. S. Rama Sastry ◽  
T. Bhimasankaram ◽  
G. S. Kumar ◽  
G. Prasad
Keyword(s):  
Comparative Study ◽  
Complex Impedance ◽  
Impedance Analysis ◽  
Equivalent Circuits ◽  
Impedance Spectra ◽  
Ceramic System ◽  
Different Temperatures ◽  
Mixed Ceramics ◽  
Mixed Ceramic ◽  
Complex Impedance Spectra

Complex impedance spectra of ferroelectric mixed ceramic system ( Na 0.5 Bi 0.5)1-x Ca x Bi 4 Ti 4 O 15 with x=0, 0.1, 0.3, 0.5, 0.7 and 1 was studied as a function of frequency and temperature in the range 1 KHz to 10 MHz and 30°C to 620°C respectively. Equivalent circuits involving resistive and capacitive elements at different temperatures, activation energies of relaxations and conduction were evaluated using impedance plots. A comparative study of impedance and conductivity facilities an insight in understanding the electrical nature of these electroceramics.

Complex Impedance Spectroscopy of Bi-Substituted Yttrium Iron Garnet (YIG)

2007 ◽  
Vol 336-338 ◽  
pp. 709-711 ◽  
Author(s):  
Hong Jie Zhao ◽  
Ji Zhou ◽  
Zhi Lun Gui ◽  
Long Tu Li
Keyword(s):  
Grain Boundaries ◽  
Yttrium Iron Garnet ◽  
Complex Impedance ◽  
Physical Structure ◽  
Impedance Spectra ◽  
Yttrium Iron ◽  
Electrical Equivalent Circuit ◽  
Small Resistance ◽  
Iron Garnet ◽  
Complex Impedance Spectra

The effects of Bi-substitution on the complex impedance spectra of yttrium iron garnet (YIG) were studied in this paper. The polycrystalline yttrium iron garnet Y2BiFe5O12 (YIG: Bi) and Y3Fe5O12 (YIG) samples were prepared by solid-reaction method. The complex impedance spectra were measured in the frequency range from 1 KHz to 100MHz at several temperatures between 210oC and 500oC. The complex impedance sample shows that the YIG: Bi can be represented by double Cole-Cole semicircles, and the YIG can be represented by a single Cole semicircle. The physical structure of the specimen was visualized as comprising of small resistance grains separated by large resistance grain boundaries in accordance with the impedance spectra observations. The electrical processes in the sample were modeled in the form of an electrical equivalent circuit made up of a series combination of two parallel RC circuits attributed to grains and grain boundaries. The temperature dependence of bulk resistance indicated an evidence of Arrhenius-type thermally activated process, showing a close to linear variation up to a temperature of 740 K.

scholarly journals Effect of Interfaces on Dielectric Relaxation in La0.35Sr0.6MnO3 -YSZ

2000 ◽  
Vol 53 (5) ◽  
pp. 715
Author(s):  
Xia Zheng-Cai ◽  
Tang Chao-Qun ◽  
Zhou Dong-Xiang ◽  
Yang Jian-Hui
Keyword(s):  
Dielectric Relaxation ◽  
Complex Impedance ◽  
Low Frequency ◽  
Impedance Spectra ◽  
Mass Rate ◽  
Relaxation Properties ◽  
Diffusion Phase ◽  
Mixed Ceramic ◽  
Complex Impedance Spectra ◽  
Dielectric Relaxation Properties

The perovskite structure material La 0.35 Sr 0.6 MnO 3 was sintered in air and the mixed ceramic of a 0.35 Sr 0.6 MnO 3 and 8 mol % Y 2 O 3 +ZrO 2 with a 1:1 mass rate was also sintered in air, both at 1530 K for 12 hour. The AC complex impedance spectra have been measured and the effect of the interface between La 0.35 Sr 0.6 MnO 3 and YSZ on dielectric relaxation properties of La 0.35 Sr 0.6 MnO 3 has been investigated. A schematic of diffusion phase formation and the equivalent circuits are proposed for explaining the results. In the complex impedance spectra, the first and second semicircles correspond to the grain-boundary and interface respectively. The results show that the dielectric relaxation properties and structure of the mixed ceramic are different to that of single phase La 0.35 Sr 0.6 MnO 3 . The interface has an important effect on the electric properties of the mixed ceramic and produces a dielectric relaxation in low frequency.

Complex Impedance Spectra of Polymer-Derived Silicon Oxycarbides

2013 ◽  
Vol 96 (5) ◽  
pp. 1363-1365 ◽  
Author(s):  
Kewei Wang ◽  
Baisheng Ma ◽  
Yiguang Wang ◽  
Linan An
Keyword(s):  
Complex Impedance ◽  
Impedance Spectra ◽  
Complex Impedance Spectra

Complex impedance spectra of chip inductor using Li–Zn–Cu–Mn ferrite

2006 ◽  
Vol 305 (1) ◽  
pp. 120-126 ◽  
Author(s):  
Tatsuya Nakamura ◽  
Masayuki Naoe ◽  
Yoshihiro Yamada
Keyword(s):  
Complex Impedance ◽  
Impedance Spectra ◽  
Complex Impedance Spectra

A Simple Model for Predicating Dielectric Constant of CaCu3Ti4O12-SrTiO3 Composite Ceramics

2011 ◽  
Vol 689 ◽  
pp. 24-28
Author(s):  
Hong Tao Yu ◽  
Wen Bo Zhang ◽  
Jing Song Liu ◽  
Lin Hong Cao ◽  
Han Xing Liu
Keyword(s):  
Dielectric Constant ◽  
Simple Model ◽  
Complex Impedance ◽  
Impedance Spectra ◽  
Composite Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grain Sizes ◽  
Complex Impedance Spectra ◽  
Variation Tendency

In this work, we have proposed a simple model to predicte the dielectric constant of CaCu3Ti4O12-SrTiO3composite ceramics. The model has been established based on the analysis of composition and microstructure. Two different compositions in the composite ceramics correspond to two different grain sizes, large for CaCu3Ti4O12, and small for SrTiO3, which has been identified by the x-ray diffraction, the scanning electron microscope and the energy spectrum analysis. All specimens have been assumed to be the barrier layer dielectrics in the model, according to the complex impedance spectra. The dielectric constant of serial, parallel, and logarithmic mixture models has been discussed. Compared with the experimental results, the model shows the similar variation tendency as SrTiO3content increases.

Humidity sensing mechanism of mesoporous MgO/KCl–SiO2 composites analyzed by complex impedance spectra and bode diagrams

2012 ◽  
Vol 174 ◽  
pp. 513-520 ◽  
Author(s):  
Wangchang Geng ◽  
Qing Yuan ◽  
Xingmao Jiang ◽  
Jinchun Tu ◽  
Libing Duan ◽  
...  
Keyword(s):  
Complex Impedance ◽  
Impedance Spectra ◽  
Humidity Sensing ◽  
Sensing Mechanism ◽  
Complex Impedance Spectra

NiO Sensing Electrode for NOx Detection at High Temperature

2013 ◽  
Vol 544 ◽  
pp. 76-80
Author(s):  
Tao Feng ◽  
Jin Feng Xia ◽  
Hong Qiang Nian ◽  
De Xin Huang ◽  
Hai Fang Xu ◽  
...  
Keyword(s):  
Screen Printing ◽  
Complex Impedance ◽  
Yttria Stabilized Zirconia ◽  
Impedance Spectra ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
X Ray ◽  
Screen Printing Technique ◽  
Printing Technique ◽  
Complex Impedance Spectra

Mixed-potential-type NO2 sensor based on yttria-stabilized zirconia(YSZ) with NiO sensing electrode was prepared by the screen-printing technique and its physical characteristics were studied by the X-ray diffraction and scanning electron microscope. The response of electromotive force (EMF) and complex impedance of the sensor were tested under different NO2 concentrations and temperatures. The results show that, at the range of 550–750 °C, the EMF values are negative and almost linear to the logarithm of NO2 concentration. But the sensitivity of the sensor and the amplitude of the EMF response to NO2 concentration both obviously decrease with the increase of the work temperature. In addition, the semicircular arcs of the complex impedance spectra shrink regularly with a raise of NO2 concentration at 600 °C.

Dielectric relaxation behavior in co-precipitation derived ferrite (Zn1−xNix)Fe2O4 (0.2 ≤ x ≤ 0.5) ceramics

2016 ◽  
Vol 30 (02) ◽  
pp. 1550277 ◽  
Author(s):  
Y. P. Jiang ◽  
R. Li ◽  
X. G. Tang ◽  
Q. X. Liu ◽  
D. G. Chen
Keyword(s):  
Activation Energy ◽  
Electrical Properties ◽  
Dielectric Relaxation ◽  
Arrhenius Equation ◽  
Complex Impedance ◽  
Impedance Spectra ◽  
Nickel Doping ◽  
Dielectric Relaxation Behavior ◽  
Co Precipitation ◽  
Complex Impedance Spectra

The influence of nickel doping on the electrical properties and dielectric relaxation in Zn[Formula: see text]Ni[Formula: see text]Fe2O4 (ZNFO, [Formula: see text]) ceramics has been investigated via the dielectric and complex impedance spectra measurements. According to the modified Curie–Weiss law, the diffusivity factor of the ZNFO ceramics from 1.69 to 2.02 with [Formula: see text] increasing from 0.2 to 0.5, respectively. Two relaxation peaks are observed in the nickel doped samples, by employing the modified Arrhenius equation, two activation energy values of different sintering temperatures were calculated and analyzed in combination with oxygen vacancy. The Cole–Cole plots showed that the semicircular arcs which are nonideal Debye type, and the grain boundaries resistance increases with increasing Ni concentration.

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