Improved thermoelectric properties of hole-doped Bi2−xNaxBa2Co2Oy ceramics

2017 ◽  
Vol 31 (06) ◽  
pp. 1750042 ◽  
Author(s):  
Wenxian Gao ◽  
Guangjiang Wang ◽  
Xinjian Li ◽  
Xing Hu ◽  
Hongzhang Song
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Thermoelectric Properties ◽  
Solid Phase ◽  
Hole Doping ◽  
Phase Method ◽  
Seebeck Coefficients ◽  
Ceramic Samples ◽  
Electrical Conductivity Behavior ◽  
Conductivity Behavior

In this work, Bi[Formula: see text]Na[Formula: see text]Ba2Co2O[Formula: see text] ([Formula: see text][Formula: see text]=[Formula: see text]0.00, 0.05, 0.10, 0.15, 0.20, 0.25 and 0.30) ceramic samples were prepared by the conventional solid phase method. The influence of Na element doping on the thermoelectric properties of samples was investigated from 300 K to 950 K. Compared with undoped sample, the Seebeck coefficients of Na-doped samples have only a slight decrease. While, the electrical resistivity of the Na-doped samples reduces, for Bi[Formula: see text]Na[Formula: see text]Ba2Co2O[Formula: see text] ceramic samples with [Formula: see text][Formula: see text][Formula: see text][Formula: see text]0.15, the electrical resistivity decreases with increasing Na doping amounts due to the hole-doping effect. In addition, its temperature-dependent resistivity exhibits metallic electrical conductivity behavior. While, the samples with [Formula: see text][Formula: see text][Formula: see text][Formula: see text]0.20 exhibit semiconductor electrical conductivity behavior at the temperature range of 473–823 K, because of the significant reduction of the electrical resistivity and the slight decrease of Seebeck coefficients, the power factors of the doped samples get a significant improvement. For the most suitable doped sample Bi[Formula: see text]Na[Formula: see text]Ba2Co2O[Formula: see text], its ZT value can reach a better value of 0.2 at 873 K.

High temperature thermoelectric properties of Bi2−xNaxSr2Co2Oy ceramics

2015 ◽  
Vol 29 (27) ◽  
pp. 1550159 ◽  
Author(s):  
Q. L. He ◽  
S. Y. Li ◽  
F. Gao ◽  
Z. Zhu ◽  
X. Hu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Thermoelectric Properties ◽  
Hole Doping ◽  
Doping Amount ◽  
Seebeck Coefficients ◽  
Na Doping ◽  
Electrical Conductivity Behavior ◽  
Lower Temperature ◽  
Conductivity Behavior

The Na doping effects on the high temperature thermoelectric properties of [Formula: see text] ([Formula: see text] = 0, 0.05, 0.10, 0.15, 0.20 and 0.30) ceramics were investigated from 343 K to 973 K. When [Formula: see text], the electrical resistivity of [Formula: see text] decreases with increasing Na doping amount due to the hole-doping effect, which exhibits metallic electrical conductivity behavior. While, at the temperature range of 480–830 K, the samples with [Formula: see text] exhibit semiconductor electrical conductivity behavior instead. The Seebeck coefficients are improved by Na doping at lower temperature, but they decrease slightly at higher temperature except for [Formula: see text]. Roughly, the thermal conductivity is depressed by the doping defects. As an overall result, the dimensionless figure of merit [Formula: see text] of [Formula: see text] reaches the maximum value of 0.3 K at 973 K, which is nearly twice the value of the undoped sample [Formula: see text].

scholarly journals Влияние легирования ванадием на термоэлектрические свойства сплавов Гейслера Fe-=SUB=-2-=/SUB=-Ti-=SUB=-1-x-=/SUB=-V-=SUB=-x-=/SUB=-Sn

2019 ◽  
Vol 53 (6) ◽  
pp. 777
Author(s):  
А.И. Таранова ◽  
А.П. Новицкий ◽  
А.И. Воронин ◽  
С.В. Таскаев ◽  
В.В. Ховайло
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Experimental Study ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Thermoelectric Properties ◽  
Pristine Sample ◽  
Electrical Conductivity Behavior ◽  
P Type ◽  
Conductivity Behavior

In this work the results of an experimental study of Fe2Ti1-xVxSn alloys (x = 0; 0.06; 0.15; 0.2) are presented. According to the temperature dependencies of the electrical conductivity, Seebeck coefficient and thermal conductivity, it is established, that the studied compositions exhibit transport properties typical for semiconductors. The substitution of V at the Ti site leads to a change of the p-type electrical conductivity behavior to n-type; the pristine sample of Fe2TiSn has the best thermoelectric properties.

Thermo-structural analysis and electrical conductivity behavior of epoxy/metals composites

2017 ◽  
Vol 104 ◽  
pp. 185-191 ◽  
Author(s):  
N. Boumedienne ◽  
Y. Faska ◽  
A. Maaroufi ◽  
G. Pinto ◽  
L. Vicente ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Structural Analysis ◽  
Electrical Conductivity Behavior ◽  
Conductivity Behavior

Influence of R3+ ion sizes on the thermoelectric properties of RBaCo4O7+δ ceramics

2015 ◽  
Vol 29 (26) ◽  
pp. 1550154 ◽  
Author(s):  
F. Gao ◽  
Q. L. He ◽  
F. Wu ◽  
D. L. Yang ◽  
X. Hu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Solid State ◽  
Thermoelectric Properties ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Oxygen Adsorption ◽  
Reaction Method ◽  
Transition Phenomenon ◽  
Seebeck Coefficients

The influence of [Formula: see text] ion sizes on the electrical resistivity, Seebeck coefficients, thermal conductivity and [Formula: see text] values of [Formula: see text] prepared by the solid-state reaction method was investigated from 373 K to 973 K. The electrical resistivity decreases with decreasing [Formula: see text] ion sizes. Both the electrical resistivity and the Seebeck coefficients have a transition at about 630 K. Especially, the transition phenomenon disappears gradually with decreasing [Formula: see text] ion sizes, and is attributed to the oxygen adsorption of [Formula: see text]. The [Formula: see text] values increase with rising temperature or decreasing [Formula: see text] ion sizes. The [Formula: see text] with the smallest [Formula: see text] size has the maximum [Formula: see text] value that reaches 0.1 at 973 K.

scholarly journals Ionic and conformational mobility in poly(vinylidene fluoride)/ionic liquid blends: Dielectric and electrical conductivity behavior

Polymer ◽  
2018 ◽  
Vol 143 ◽  
pp. 164-172 ◽  
Author(s):  
D.M. Correia ◽  
R. Sabater i Serra ◽  
J.A. Gómez Tejedor ◽  
V. de Zea Bermudez ◽  
A. Andrio Balado ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Ionic Liquid ◽  
Vinylidene Fluoride ◽  
Conformational Mobility ◽  
Electrical Conductivity Behavior ◽  
Poly Vinylidene Fluoride ◽  
Conductivity Behavior

OCCURRENCE OF SUPERCONDUCTIVITY IN Ca-DOPED (Pb,Cu)Sr2PrCu2Oz

2005 ◽  
Vol 19 (01n03) ◽  
pp. 361-367
Author(s):  
H. K. LEE ◽  
Y. H. KIM ◽  
D. H. HA
Keyword(s):  
Magnetic Properties ◽  
Electrical Resistivity ◽  
Structural Changes ◽  
Hole Doping ◽  
Ca Doping ◽  
Bulk Ceramic ◽  
Electrical And Magnetic Properties ◽  
Ceramic Samples ◽  
Doping Effects ◽  
Occurrence Of Superconductivity

We have investigated the Ca -doping effects on the structural, electrical and magnetic properties of ( Pb 0.5 Cu 0.5) Sr 2( Pr 1-x Ca x Cu 2 O z( x =0-0.5) bulk ceramic samples. The electrical resistivity, thermoelectric power and magnetic susceptibility measurements reveal that the Ca doping introduces holes into the system and thereby superconductivity with onset T c, of about 36 K is induced for a phase with x =0.5. These results are discussed in conjunction with the roles of hole doping, structural changes and Pr - O hybridization in CuO 2 layers.

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