Total electrical conductivity and defect structure of ZrO2–CeO2–Y2O3–Gd2O3 solid solutions

2000 ◽  
Vol 135 (1-4) ◽  
pp. 403-409 ◽  
Author(s):  
A Tsoga
Keyword(s):  
Electrical Conductivity ◽  
Solid Solutions ◽  
Defect Structure ◽  
Total Electrical Conductivity

scholarly journals Influence of cation substitution on electrical conductivity of microcrystalline ceramics based on (Cu1-xAgx)7GeSe5I solid solutions

2021 ◽  
Vol 24 (02) ◽  
pp. 131-138
Author(s):  
I.P. Studenyak ◽  
◽  
A.I. Pogodin ◽  
V.I. Studenyak ◽  
T.O. Malakhovska ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Solid Solutions ◽  
Electronic Conductivity ◽  
Microstructural Analysis ◽  
Cation Substitution ◽  
Cationic Sublattice ◽  
Total Electrical Conductivity ◽  
Complex Process ◽  
Nonlinear Character ◽  
Average Size

Ceramic samples based on the microcrystalline powders (Cu1–хAgx)7GeSe5I (x = 0, 0.25, 0.5, 0.75, 1) were prepared by pressing them at the pressure close to 400 MPa and subsequent annealing at 873 K for 36 hours. Using the microstructural analysis, the average size of microcrystallites of these samples was determined. Investigation of electrical conductivity of ceramics based on (Cu1 хAgx)7GeSe5I solid solutions was carried out using the method of impedance spectroscopy in the frequency range from 10 Hz to 3×105 Hz and within the temperature range 293...383 K. Analysis of the Nyquist plots allowed determining the contributions of ionic and electronic components to the total electrical conductivity. The temperature dependence of ionic and electronic conductivity in Arrhenius coordinates is linear, which indicates their thermoactivation character. The compositional behaviour of ionic and electronic conductivity, as well as their activation energies have been studied. Their nonlinear character can be explained by the complex process of recrystallization and Cu+ ↔ Ag+ cation substitution within the cationic sublattice.

Defect structure and electrical conductivity in rapidly-quenched and slowly-cooled rhombohedral solid solutions of the system Bi2O3-BaO

1985 ◽  
Vol 20 (9) ◽  
pp. 3125-3130 ◽  
Author(s):  
Takeyuki Suzuki ◽  
Yoshitaka Dansui ◽  
Tetsuji Shirai ◽  
Chikako Tsubaki
Keyword(s):  
Electrical Conductivity ◽  
Solid Solutions ◽  
Defect Structure

scholarly journals Electrical Conductivity Studies of Composites Based on (Cu1–xAgx)7GeSe5I Solid Solutions

2020 ◽  
Vol 65 (1) ◽  
pp. 55
Author(s):  
A. I. Pogodin ◽  
M. M. Luchynets ◽  
V. I. Studenyak ◽  
O. P. Kokhan ◽  
I. P. Studenyak ◽  
...  
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Impedance Spectroscopy ◽  
Solid Solutions ◽  
Frequency Range ◽  
Total Electrical Conductivity ◽  
Cationic Substitution ◽  
Nyquist Plots ◽  
Ionic Components ◽  
Frequency Dependences

Polymer composites based on (Cu1−xAgx)7GeSe5I solid solutions are produced. The electrical conductivity of the composites is measured by impedance spectroscopy in the frequency range from 20 Hz to 2×106 Hz and in the temperature interval 292–338 K. The frequency dependences of the total electrical conductivity are obtained, the Nyquist plots are constructed, and their analysis is performed. The effect of Cu+ →Ag+ cationic substitution on the total electrical conductivity and the activation energy, as well as on the electronic and ionic components of the electrical conductivity of composites based on (Cu1−xAgx)7GeSe5I solid solutions is studied on the basis of compositional dependences.

Study of Electrical Conductivity in WO3-doped Nonstoichiometric LiTaO3

2012 ◽  
Vol 57 (8) ◽  
pp. 834
Author(s):  
M. Tahiri ◽  
N. Masaif ◽  
A. Jennane ◽  
E.M. Lotfi
Keyword(s):  
Experimental Data ◽  
Electrical Conductivity ◽  
Ternary System ◽  
Curie Temperature ◽  
Solid Solutions ◽  
Theoretical Approach ◽  
Defect Structure ◽  
Experimental Conductivity ◽  
Theoretical Results ◽  
Good Agreement

The results of experimental and analytical studies of the electrical conductivity for different solid solutions synthesized in a vicinity of LiTaO3 in the ternary system Li2O–Ta2O5–(WO3)2 are presented. It is shown that the electrical conductivity increases linearly with the Curie temperature. The experimental conductivity between 200 and 700 ºC was measured using an LCR bridge HP4192A on ceramics sintered at 1250 ºC. Within the theoretical approach to the defect structure analysis combined with our proposed vacancy models, the theoretical results are in a good agreement with the experimental data.

Electrical conductivity and defect structure of the ThxLu2−2xO3−x solid solutions

1990 ◽  
Vol 51 (6) ◽  
pp. 571-574
Author(s):  
Byoung Chan Kwak ◽  
Seung Koo Cho ◽  
Gweon Heo ◽  
Keu Hong Kim ◽  
Jae Shi Choi
Keyword(s):  
Electrical Conductivity ◽  
Solid Solutions ◽  
Defect Structure

Electrical conductivity and structure of solid solutions formed in the La0.8Sr0.2MnO3–La0.95Ni0.6Fe0.4O3 system

2008 ◽  
Vol 179 (27-32) ◽  
pp. 1432-1435 ◽  
Author(s):  
Elena Konysheva ◽  
John T.S. Irvine ◽  
Astrid Besmehn
Keyword(s):  
Electrical Conductivity ◽  
Solid Solutions

Defect Structure and Ionic Transport in the MF2-RF3 (M = Ba, Sr; R = La - Lu, Y, Sc) Solid Solutions

2003 ◽  
Vol 90-91 ◽  
pp. 439-444 ◽  
Author(s):  
Viera Trnovcová ◽  
N.I. Sorokin ◽  
P.P. Fedorov ◽  
L.S. Garashina ◽  
E.A. Krivandina ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Defect Structure ◽  
Ionic Transport

Electrical Properties of Y0.06Sr0.94Ti0.6Fe0.4O3-δ-YSZ Composites as Electrode Materials

2016 ◽  
Vol 697 ◽  
pp. 327-330 ◽  
Author(s):  
Ke Shan ◽  
Xing Min Guo ◽  
Feng Rui Zhai ◽  
Zhong Zhou Yi
Keyword(s):  
Electrical Conductivity ◽  
Electrode Materials ◽  
Electronic Conductivity ◽  
Ionic Conductivities ◽  
Conductivity Measurement ◽  
Transference Numbers ◽  
Secondary Phases ◽  
Electrical Conductivity Measurement ◽  
Total Electrical Conductivity ◽  
Phase Compatibility

Y0.06Sr0.94Ti0.6Fe0.4O3-δ-YSZ composites were prepared by mixing Y, Fe co-doped SrTiO3 (Y0.06Sr0.94Ti0.6Fe0.4O3-δ known as YSTF) and 8 mol% Y2O3 stabilized ZrO2 (YSZ) in different weight fractions. The phase stability, phase compatibility, microstructure and mixed ionic-electronic conductivity of composites were investigated. Phase analysis by XRD showed no clearly detectable secondary phases. The electrical conductivity measurement on the YSTF-YSZ composites showed a drastic decrease in total electrical and ionic conductivities when more than 10 wt% of YSZ was used in the composites. The total electrical conductivity was 0.102 S/cm for Y0.06Sr0.94Ti0.6Fe0.4O3-δ and 0.043 S/cm for YSTF-20YSZ at 700 oC, respectively. The value at 700 oC is approximately 2.4 times higher than that of YSTF-20YSZ. The ionic conductivity of Y0.06Sr0.94Ti0.8Fe0.2O3-δ varies from 0.015S/cm at 700 oC to 0.02 S/cm at 800 oC, respectively. The value at 800°C is approximately 12.5 times higher than YSTF-20YSZ. The ion transference numbers of YSTF-YSZ composites vary from 0.14 to 0.28 at 800 °C.

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