Perovskite-Type Metal Oxides Exhibiting Negligible Grain Boundary Resistance to Total Electrical Conductivity

2011 ◽  
Vol 50 (2) ◽  
pp. 647-655 ◽  
Author(s):  
Tania Pannu ◽  
Kanwar Gulsher Singh Pannu ◽  
Venkataraman Thangadurai
Keyword(s):  
Electrical Conductivity ◽  
Grain Boundary ◽  
Metal Oxides ◽  
Boundary Resistance ◽  
Total Electrical Conductivity ◽  
Perovskite Type

Grain Size and Chemical Composition Effects on the Grain Boundary Resistance of Ceria

2002 ◽  
Vol 730 ◽  
Author(s):  
Xiao-Dong Zhou ◽  
Harlan U. Anderson ◽  
Wayne Huebner
Keyword(s):  
Electrical Conductivity ◽  
Grain Size ◽  
Grain Boundary ◽  
Boundary Resistance ◽  
Impedance Spectra ◽  
Total Resistance ◽  
Boundary Area ◽  
Oxygen Ions ◽  
Composition Effects ◽  
Increasing Temperature

AbstractStudies related to the effects of grain size (30nm – 5.0μm) on the electrical conductivity of undoped CeO2 and Ce0.90Gd0.10O1.95 were performed. A series of impedance spectra as a function of temperature and grain size were analyzed. It was found that the ratio of the grain boundary resistance to the total resistance became lower with decreasing grain size, increasing temperature or increasing Gd content. For the case of Gd doped CeO2, the source of the grain boundary resistance may be due to the trapping of oxygen ions in the grain boundary area.

scholarly journals Effect of intergranular glass films on the electrical conductivity of 3Y-TZP

1994 ◽  
Vol 9 (5) ◽  
pp. 1228-1240 ◽  
Author(s):  
M. Gödickemeier ◽  
B. Michel ◽  
A. Orliukas ◽  
P. Bohac ◽  
K. Sasaki ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Grain Boundary ◽  
Characteristic Temperature ◽  
Complex Impedance ◽  
Layer Model ◽  
Total Electrical Conductivity ◽  
Intergranular Films ◽  
Brick Layer Model ◽  
Equilibrium Thickness ◽  
Glass Films

The electrical conductivity of 3Y-TZP ceramics containing SiO2 and Al2O3 has been investigated by complex impedance spectroscopy between 500 and 1270 K. At low temperatures, the total electrical conductivity is suppressed by the grain boundary glass films. The equilibrium thickness of intergranular films is 1-2 nm, as derived using the “brick-layer” model and measured by HRTEM. A change in the slope of the conductivity Arrhenius plots occurs at the characteristic temperature Tb at which the macroscopic grain boundary resistivity has the same value as the resistivity of the grains. The temperature dependence of the conductivity is discussed in terms of a series combination of RC elements.

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.

Effect of Aging Treatment on Properties and Microstructure of an Al-7.5Zn-1.3Mg-1.4Cu-0.12Zr Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 273-278 ◽  
Author(s):  
Xi Wu Li ◽  
Bai Qing Xiong ◽  
Yon Gan Zhang ◽  
Guo Jun Wang ◽  
Zhi Hui Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Grain Boundary ◽  
Response Rate ◽  
Aging Treatment ◽  
Aging Response ◽  
Peak Aging

In this study, the effect of various aging treatment (T6 and T7 treatment) on the mechanical properties, electrical conductivity and the microstructure of an Al-7.5Zn-1.3Mg-1.4Cu-0.12Zr alloy has been investigated. The results show that with elevating the aging treatment temperatures, the aging response rate is greatly accelerated. When T6 temper is performed at 140°C for 12h, as compared to peak aging for 24h at 120°C, the UTS and the corresponding Elongation values keep the same level, whereas the TYS and the electrical conductivity obviously increase by 5% and 9%, which is up to 560 MPa and 22.6 MS/m, respectively. And there are clear PFZs along the grain boundary and slightly coarser precipitates inside the grain. GPI zones, GPII zones and η' phases are major precipitates for the alloy under T6 condition. When T7 temper is performed on the alloy, the main precipitates are GPII zones, η′ and η phases. The coarser precipitates inside the grain and discontinuous grain boundary precipitates are favorable to electrical conductivity, which decrease the strength of 5~17% compared to T6 treatment. After T76 treatment (i.e., 110°C/6 h + 160°C/6 h), the UTS, TYS, Elongation and electrical conductivity values were 540 MPa, 510 MPa, 16.7% and 23.5 MS/m, respectively.

Effect of Impurity Silica on Grain Boundary Resistance of Yttrium-doped Barium Zirconate

2010 ◽  
Vol 29 (5-6) ◽  
pp. 339-346
Author(s):  
Susumu Imashuku, ◽  
Takaaki Tanaka, ◽  
Akiko Kuramitsu, ◽  
Yoshitaro Nose, ◽  
Tetsuya Uda,
Keyword(s):  
Grain Boundary ◽  
Boundary Resistance ◽  
Barium Zirconate

scholarly journals Detection of grain-boundary resistance to slip transfer using nanoindentation

2005 ◽  
Vol 59 (24-25) ◽  
pp. 3192-3195 ◽  
Author(s):  
W.A. Soer ◽  
J.Th.M. De Hosson
Keyword(s):  
Grain Boundary ◽  
Boundary Resistance ◽  
Slip Transfer

Effect of metal oxides on the densification and electrical conductivity of the GdSmZr 2 O 7 ceramic

2014 ◽  
Vol 617 ◽  
pp. 393-398 ◽  
Author(s):  
Zhan-Guo Liu ◽  
Jia-Hu Ouyang ◽  
Ke-Ning Sun ◽  
Yu Zhou
Keyword(s):  
Electrical Conductivity ◽  
Metal Oxides

Unravelling the structural and dynamical complexity of the equilibrium liquid grain-binding layer in highly conductive organic crystalline electrolytes

2018 ◽  
Vol 6 (10) ◽  
pp. 4394-4404 ◽  
Author(s):  
Prabhat Prakash ◽  
Jordan Aguirre ◽  
Megan. M. Van Vliet ◽  
Parameswara Rao Chinnam ◽  
Dmitriy A. Dikin ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Grain Boundary ◽  
Solid Electrolyte ◽  
Boundary Resistance ◽  
Bulk Solid ◽  
Dynamical Complexity ◽  
Surface Liquid

A nanolayer of surface liquid phase in equilibrium with the bulk solid is responsible for the low grain boundary resistance in the solid electrolyte LiCl·DMF, as supported by a combination of experiment, theory, and modelling.

Lattice constants of perovskite-type metal oxides as investigated by molecular dynamics and computer graphics

1993 ◽  
pp. 1017-1020
Author(s):  
Akira Miyamoto ◽  
Kazufumi Matsubara ◽  
Takahiro Hattori ◽  
Momoji Kubo ◽  
Tomoyuki Inui
Keyword(s):  
Molecular Dynamics ◽  
Computer Graphics ◽  
Metal Oxides ◽  
Lattice Constants ◽  
Perovskite Type
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