High temperature thermoelectric properties of Bi2−xNaxSr2Co2Oy ceramics

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].

Download Full-text

Improved thermoelectric properties of hole-doped Bi2−xNaxBa2Co2Oy ceramics

International Journal of Modern Physics B ◽

10.1142/s0217979217500424 ◽

2017 ◽

Vol 31 (06) ◽

pp. 1750042 ◽

Cited By ~ 11

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.

Download Full-text

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

Физика и техника полупроводников ◽

10.21883/ftp.2019.06.47727.36 ◽

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.

Download Full-text

Thermoelectric Properties of Cu-Substituted Bi2Ca2Co2Oy Misfit Oxides

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.284-286.2263 ◽

2011 ◽

Vol 284-286 ◽

pp. 2263-2267 ◽

Cited By ~ 4

Author(s):

Hao Shan Hao ◽

Qing Lin He ◽

Li Min Zhao

Keyword(s):

Electrical Conductivity ◽

Grain Size ◽

High Temperature ◽

Solid State ◽

Thermoelectric Properties ◽

Solid State Reaction Method ◽

Reaction Method ◽

Seebeck Coefficients ◽

Cu Substitution ◽

Performance System

Co2-xCuxOy (x=0.0, 0.2, 0.4) Samples were prepared by solid-state reaction method and the effect of Cu substitution on the thermoelectric properties was investigated. The presence of Cu element improved the grain size and electrical conductivity, but Seebeck coefficients were reduced by Cu substitution. It was found Cu substitution is an effective way to improve the thermoelectric performance system at high temperature.

Download Full-text

The Effects of Ba0.85Ca0.15Zr0.1Ti0.9O3 Addition on the Phase, Microstructure, and Thermoelectric Properties of Ca3Co4O9 Ceramics

10.21203/rs.3.rs-1130828/v1 ◽

2021 ◽

Author(s):

Panupong JAIBAN ◽

Pimpilai WANNASUT ◽

Anucha WATCHARAPASORN

Keyword(s):

Thermal Conductivity ◽

Electrical Conductivity ◽

High Temperature ◽

Thermoelectric Properties ◽

Figure Of Merit ◽

Charge Carrier Concentration ◽

Thermoelectric Device ◽

Thermoelectric Power Factor ◽

Seebeck Coefficients ◽

Solid State Sintering

Abstract In this work, the influences of Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) addition on phase, microstructure, and thermoelectric properties of Ca3Co4O9 (CCO) were investigated. (1-x)CCO-(x)BCZT ceramics where x = 0, 0.003, 0.005, and 0.010 were fabricated successfully via a conventional solid-state sintering at 1,223 K for 24 hrs. The substitution of BCZT introduced the chemical defects (V''Co, V'''Co, V''Ca) in CCO ceramic, which increased charge carrier concentration and enhanced the electrical conductivity. The presence of Co3+ improved the Seebeck coefficients of CCO ceramic. The thermal conductivity of CCO ceramic decreased when BCZT was added. The addition of BCZT at x = 0.010 promoted the highest thermoelectric power factor (PF~235 mW/mK2), and the highest figure of merit (ZT~0.5) at 800 K, which present this ceramic an alternative p-type oxide thermoelectric for a high-temperature thermoelectric device.

Download Full-text

A comparison of oil-impregnated pressboard electrical conductivity behavior for two different high density pressboards

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) ◽

10.1109/icdl.2017.8124661 ◽

2017 ◽

Author(s):

F. Vahidi ◽

S. Haegele ◽

S. Tenbohlen

Keyword(s):

Electrical Conductivity ◽

High Density ◽

Electrical Conductivity Behavior ◽

Conductivity Behavior

Download Full-text

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

Journal of Physics and Chemistry of Solids ◽

10.1016/j.jpcs.2017.01.018 ◽

2017 ◽

Vol 104 ◽

pp. 185-191 ◽

Cited By ~ 6

Author(s):

N. Boumedienne ◽

Y. Faska ◽

A. Maaroufi ◽

G. Pinto ◽

L. Vicente ◽

...

Keyword(s):

Electrical Conductivity ◽

Structural Analysis ◽

Electrical Conductivity Behavior ◽

Conductivity Behavior

Download Full-text

Development and electrical conductivity behavior of copper-powder-filled-epoxy graded composites

Journal of Applied Polymer Science ◽

10.1002/app.28267 ◽

2008 ◽

Vol 109 (4) ◽

pp. 2384-2387 ◽

Cited By ~ 5

Author(s):

Navin Chand ◽

Archana Nigrawal

Keyword(s):

Electrical Conductivity ◽

Copper Powder ◽

Electrical Conductivity Behavior ◽

Conductivity Behavior

Download Full-text

Electrical Conductivity Behavior of Polymer Nanocomposite with Carbon Nanofillers

Electrical Conductivity in Polymer-Based Composites: Experiments, Modelling and Applications ◽

10.1016/b978-0-12-812541-0.00003-3 ◽

2019 ◽

pp. 41-72

Author(s):

Ayesha Kausar ◽

Reza Taherian

Keyword(s):

Electrical Conductivity ◽

Polymer Nanocomposite ◽

Electrical Conductivity Behavior ◽

Carbon Nanofillers ◽

Conductivity Behavior

Download Full-text

High-temperature thermoelectric properties of n-type BayNixCo4−xSb12

Journal of Materials Research ◽

10.1557/jmr.2001.0460 ◽

2001 ◽

Vol 16 (12) ◽

pp. 3343-3346 ◽

Cited By ~ 32

Author(s):

X. F. Tang ◽

L. M. Zhang ◽

R. Z. Yuan ◽

L. D. Chen ◽

T. Goto ◽

...

Keyword(s):

Thermal Conductivity ◽

Electrical Conductivity ◽

High Temperature ◽

Seebeck Coefficient ◽

Thermoelectric Properties ◽

Electron Concentration ◽

Lattice Thermal Conductivity ◽

Filling Fraction ◽

Ni Content ◽

Increasing Temperature

Effects of Ba filling fraction and Ni content on the thermoelectric properties of n-type BayNixCo4−xSb12 (x = 0−0.1, y = 0−0.4) were investigated at temperature range of 300 to 900 K. Thermal conductivity decreased with increasing Ba filling fraction and temperature. When y was fixed at 0.3, thermal conductivity decreased with increasing Ni content and reached a minimum value at about x = 0.05. Lattice thermal conductivity decreased with increasing Ni content, monotonously (y ≤ 0.1). Electron concentration and electrical conductivity increased with increasing Ba filling fraction and Ni content. Seebeck coefficient increased with increasing temperature and decreased with increasing Ba filling fraction and Ni content. The maximum ZT value of 1.25 was obtained at about 900 K for n-type Ba0.3Ni0.05Co3.95Sb12.

Download Full-text