The effect of co-doping with MgO and Yb2O3 on the structure and electrical conductivity of the Sm2Zr2O7 pyrochlore

2011 ◽  
Vol 56 (7) ◽  
pp. 2837-2841 ◽  
Author(s):  
Zhan-Guo Liu ◽  
Xian-Zhong Xiong ◽  
Jia-Hu Ouyang ◽  
Jun Xiang
Keyword(s):  
Electrical Conductivity ◽  
Co Doping

scholarly journals Submicrometric Fibrillar Structures of Codoped Polyaniline Obtained by Co-oxidation Using the NaClO/Ammonium Peroxydisulfate System: Synthesis and Characterization

2017 ◽  
Vol 57 (4) ◽  
Author(s):  
Jorge Enrique Osorio-Fuente ◽  
Carlos Gómez-Yáñez ◽  
María De los Ángeles Hernández-Pérez ◽  
Mónica De la Luz Corea-Téllez
Keyword(s):  
Electrical Conductivity ◽  
Co Oxidation ◽  
Sodium Hypochlorite ◽  
Polymerization Rate ◽  
Synthesis And Characterization ◽  
Aromatic Rings ◽  
Co Doping ◽  
Ammonium Peroxydisulfate ◽  
Structure Morphology ◽  
Morphology Changes

A mixture of ammonium peroxydisulfate and sodium hypochlorite (NaClO) (co-oxidating system) were used to obtain polyaniline (PANi) doped with HCl and camphorsulfonic acid (CSA) (co-doping). The effect of HCl/CSA ratio added during polymerization on structure, morphology and electrical conductivity of the conducting polymer was investigated. When NaClO is used, the polymerization rate is substantially increased and the morphology changes from micrometric granular to nanometric fibrillar. CSA was used as complementary dopant but also to improve the solubility of PANi in common solvents. However, results suggest that quinone-like heterocycles containing carbonyl radicals as well as phenazine-type aromatic rings might be impeding an efficient doping in detriment of the conductivity.

Effects of Yttria and Calcia Co-Doping on the Electrical Conductivity of Zirconia Ceramics

2007 ◽  
Vol 44 (12) ◽  
pp. 655-659 ◽  
Author(s):  
Jong-Sook Lee ◽  
Dong-Kyu Shin ◽  
Byung-Yun Choi ◽  
Jung-Kwang Jeon ◽  
Sung-Hwan Jin ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Zirconia Ceramics ◽  
Co Doping

scholarly journals Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms

2017 ◽  
Author(s):  
Mi-Kyung Han ◽  
Yingshi Jin ◽  
Da-Hee Lee ◽  
Sung-Jin Kim
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Carrier Concentration ◽  
Thermoelectric Properties ◽  
Thermal Transport ◽  
Co Doping ◽  
Thermal Transport Properties ◽  
Co Doped

In order to understand the effect of Pb-CuI co-doping on the thermoelectric performance of Bi2Te3, n-type Bi2Te3 co-doped with x at% CuI and 1/2x at% Pb (x = 0, 0.01, 0.03, 0.05, 0.07, and 0.10) were prepared via high temperature solid state reaction and consolidated using spark plasma sintering. Electron and thermal transport properties, i.e., electrical conductivity, carrier concentration, Hall mobility, Seebeck coefficient, and thermal conductivity, of CuI-Pb co-doped Bi2Te3 were measured in the temperature range from 300 K to 523 K and compared to corresponding x% of CuI-doped Bi2Te3 and undoped Bi2Te3. The addition of a small amount of Pb significantly decreased the carrier concentration, which could be attributed to the holes from Pb atoms, thus the CuI-Pb co-doped samples show a lower electrical conductivity and a higher Seebeck coefficient compared to CuI-doped samples with similar x values. The incorporation of Pb into CuI-doped Bi2Te3 rarely changed the power factor because of the trade-off relationship between the electrical conductivity and the Seebeck coefficient. The total thermal conductivity(κtot) of co-doped samples (κtot ~1.4 W/m∙K at 300 K) is slightly lower than that of 1% CuI-doped Bi2Te3 (κtot~1.5 W/m∙K at 300 K) and undoped Bi2Te3 (κtot ~1.6 W/m∙K at 300 K) due to the alloy scattering. The 1% CuI-Pb co-doped Bi2Te3 sample shows the highest ZT value of 0.96 at 370 K. All data on electrical and thermal transport properties suggest that the thermoelectric properties of Bi2Te3 and its operating temperature can be controlled by co-doping.

Significant Influences of Co-Doping Ag and Sb on Electrical Properties and Thermoelectric Applications of AgPbmSbTem+2 Compounds Synthesized Using Solid State Microwave Technique

2015 ◽  
Vol 819 ◽  
pp. 193-197 ◽  
Author(s):  
Arshad Hmood ◽  
Arej Kadhim ◽  
H.A. Hassan
Keyword(s):  
Electrical Conductivity ◽  
Solid State ◽  
Seebeck Coefficient ◽  
Lead Telluride ◽  
Thermoelectric Power Factor ◽  
Microwave Technique ◽  
Co Doping ◽  
Thermoelectric Measurements ◽  
Simultaneous Doping

In this paper we reported the electrical conductivity and thermoelectric characterization of silver (Ag) and antimony (Sb) co-doped lead telluride bulk materials, which have been synthesized using solid state microwave technique. The doping level has performed first-principle calculations for the AgPbmSbTem+2 (LAST-m) (m = 0, 2, 4, 6, 8 and 10) to clarify the effect of simultaneous doping of Ag and Sb on PbTe. The Hall effect and thermoelectric measurements have shown n-type conductivity in AgPbmSbTem+2 samples. The samples show large and negative values of the Seebeck coefficient and moderate electrical conductivity. The Seebeck coefficient increased with doping levels increases at m=0 to 10. The value of the Seebeck coefficient is −419.69 μVK−1 for AgPb8SbTe10 at 338 K. It has been found that AgPb8SbTe10 sample has a higher thermoelectric power factor 1.87 mW K-2 m-1 at 310 K.

scholarly journals Effects of Sr and Mn co-doping on microstructural evolution and electrical properties of LaAlO3

2019 ◽  
Vol 13 (4) ◽  
pp. 333-341
Author(s):  
Lúcia Villas-Boas ◽  
Celso Goulart ◽  
de Ferreira
Keyword(s):  
Electrical Conductivity ◽  
Catalytic Activity ◽  
Electrical Properties ◽  
Perovskite Structure ◽  
Dopant Concentration ◽  
Microstructural Development ◽  
Co Doping ◽  
Total Electrical Conductivity ◽  
Electrode Reactions ◽  
Co Doped

In this work, we investigate the effects of Sr and Mn co-doping on the microstructural development and electrical properties of LaAlO3 synthesised by solid state reaction and sintered at 1500 and 1600?C. The addition of Sr and Mn contributed to the crystallization and stabilization of the perovskite structure. However, the addition of Sr alone lead to the formation of heterogeneous microstructure, while the combined effect of Sr and Mn improved Al and La homogeneity in the perovskite structure. Total electrical conductivity is enhanced by three orders of magnitude with Sr addition (La0.8Sr0.2AlO3-?: 5.74 ? 10?4 S/cm at 600?C) and five orders of magnitude with Mn co-doping (La0.8Sr0.2Al0.8Mn0.2O3-?: 3.6 ? 10?2 S/cm at 600?C) compared to the undoped LaAlO3 (2.96 ? 10?6 S/cm at 600?C). The Sr and Mn co-doped LaAlO3 present favourable catalytic activity for electrode reactions even with a low dopant concentration (20mol%).

A combinatorial chemical beam vapour deposition approach to tune the electrical conductivity of Nb:TiO2 films via Si co-doping

2016 ◽  
Vol 615 ◽  
pp. 265-270 ◽  
Author(s):  
C.S. Sandu ◽  
E. Wagner ◽  
S. Harada ◽  
G. Benvenuti ◽  
W. Maudez ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Vapour Deposition ◽  
Co Doping

Cobalt oxide co-doping effect on the sinterability and electrical conductivity of nano-crystalline Gd-doped ceria

2012 ◽  
Vol 38 ◽  
pp. S497-S500 ◽  
Author(s):  
D. Hari Prasad ◽  
S.Y. Park ◽  
H. Ji ◽  
H.-R. Kim ◽  
J.-W. Son ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Cobalt Oxide ◽  
Doping Effect ◽  
Doped Ceria ◽  
Co Doping ◽  
Nano Crystalline
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