Ultrahigh electrical conductivities and low lattice thermal conductivities of La, Dy, and Nb Co-doped SrTiO3 thermoelectric materials with complex structures

2020 ◽  
Vol 52 ◽  
pp. 172-179 ◽  
Author(s):  
Daquan Liu ◽  
Yanxia Wang ◽  
Xue Jiang ◽  
Huijun Kang ◽  
Xiong Yang ◽  
...  
Keyword(s):  
Thermoelectric Materials ◽  
Complex Structures ◽  
Electrical Conductivities ◽  
Co Doped ◽  
Thermal Conductivities

scholarly journals Metal phosphides as potential thermoelectric materials

2017 ◽  
Vol 5 (47) ◽  
pp. 12441-12456 ◽  
Author(s):  
Jan-Hendrik Pöhls ◽  
Alireza Faghaninia ◽  
Guido Petretto ◽  
Umut Aydemir ◽  
Francesco Ricci ◽  
...  
Keyword(s):  
Thermoelectric Materials ◽  
Thermoelectric Performance ◽  
Band Structures ◽  
Electronic Band ◽  
Metal Phosphides ◽  
Electronic Band Structures ◽  
Thermal Conductivities

Metal phosphides are predicted to have high thermoelectric performance due to enhanced electronic band structures and low thermal conductivities.

Cryogenic thermal expansion and electrical conductivities of Mn3CuN co-doped with Sb and Sn

2012 ◽  
Author(s):  
X. X. Chu ◽  
R. J. Huang ◽  
Z. X. Wu ◽  
Z. Chen ◽  
L. F. Li
Keyword(s):  
Thermal Expansion ◽  
Electrical Conductivities ◽  
Co Doped

scholarly journals Substitution Versus Full-Heusler Segregation in TiCoSb

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 935 ◽  
Author(s):  
Maryana Asaad ◽  
Jim Buckman ◽  
Jan-Willem Bos
Keyword(s):  
Powder Metallurgy ◽  
Power Factor ◽  
Thermoelectric Materials ◽  
Room Temperature ◽  
The Difference ◽  
P Type ◽  
Full Heusler ◽  
Thermal Conductivities

Half-Heuslers (HHs) are promising thermoelectric materials with great compositional flexibility. Here, we extend work on the p-type doping of TiCoSb using abundant elements. Ti0.7V0.3Co0.85Fe0.15Sb0.7Sn0.3 samples with nominal 17.85 p-type electron count were investigated. Samples prepared using powder metallurgy have negative Seebeck values, S ≤ −120 µV K−1, while arc-melted compositions are compensated semiconductors with S = −45 to +30 µV K−1. The difference in thermoelectric response is caused by variations in the degree of segregation of V(Co0.6Fe0.4)2Sn full-Heusler and Sn phases, which selectively absorb V, Fe, and Sn. The segregated microstructure leads to reduced lattice thermal conductivities, κlat = 4.5−7 W m−1 K−1 near room temperature. The largest power factor, S2/ρ = 0.4 mW m−1 K−2 and ZT = 0.06, is observed for the n-type samples at 800 K. This works extends knowledge regarding suitable p-type dopants for TiCoSb.

scholarly journals The effects of temperature and pressure on the thermal conductivities of solids. Part II.—The effect of low temperatures on the thermal conductivities of pure metals and alloys

1908 ◽  
Vol 80 (536) ◽  
pp. 143-145 ◽  
Keyword(s):  
Olive Oil ◽  
Thermal Contact ◽  
Metals And Alloys ◽  
Copper Tube ◽  
External Diameter ◽  
Electrical Conductivities ◽  
Effects Of Temperature ◽  
The Difference ◽  
A Current ◽  
Thermal Conductivities

The object of the work described in the present paper was to extend the measurements of Thermal Conductivities of Metals and Alloys made by Lorenz, Jäger and Diesselhorst, and others at temperatures between 0°C. and 100°C. down to the temperature of liquid air, and thus provide a means of comparing the Thermal and Electrical Conductivities of these substances over a much wider range of temperature than has hitherto been possible. The method adopted was a modification of that used originally by Wiedemann and Franz. A rod of the metal, 7 or 8 cm. long, 0∙6 cm. in diameter, was placed in the axis of a vertical copper tube of 2∙7 cm. internal 3∙3 cm. external diameter, 9∙5 cm. long, closed at the top. The lower end of the rod fitted into a copper disc, which in its turn fitted into the lower end of the copper tube. The joints were accurately made and were smeared with olive oil to exclude air and improve the thermal contact. The heat which flowed along the rod was supplied electrically by means of a current through a fine platinoid wire wound on a short thin brass sleeve, which was slipped on to the upper end of the rod. The difference of temperatures at two points of the rod, between the heating coil and the point where the rod entered the disc forming the lower end of the tube, was measured by means of two platinum thermometers, the wires of which were wound on two short thin brass sleeves, capable of sliding along the rod. The three sleeves fitted the rod closely, and thermal contact was improved by smearing rod and sleeves with a little olive oil.

Semiconducting quaternary chalcogenide glasses as new potential thermoelectric materials: an As–Ge–Se–Sb case

2015 ◽  
Vol 44 (33) ◽  
pp. 14799-14804 ◽  
Author(s):  
A. Dahshan ◽  
Pankaj Sharma ◽  
K. A. Aly
Keyword(s):  
Thermoelectric Materials ◽  
Chalcogenide Glasses ◽  
Complex Structures

The performance of chalcogenides as thermoelectric materials may be improved via complex structures, impurities, disorder etc.

scholarly journals Dielectric relaxation in pure and Co-doped Bi12GeO20 single crystals

2015 ◽  
Vol 05 (03) ◽  
pp. 1550023 ◽  
Author(s):  
C. Filipič ◽  
A. Klos ◽  
M. Gajc ◽  
D. A. Pawlak ◽  
J. Dolinšek ◽  
...  
Keyword(s):  
Dielectric Relaxation ◽  
Single Crystals ◽  
Dielectric Constants ◽  
Complex Dielectric Constant ◽  
Spectroscopy Study ◽  
Potential Barriers ◽  
Thermally Activated ◽  
Electrical Conductivities ◽  
Co Nanoparticles ◽  
Co Doped

We report the results of investigation of dielectric spectroscopy study of single crystals of [Formula: see text] and [Formula: see text] doped with Co nanoparticles. The complex dielectric constant was measured in the temperature interval from 5 to 450 K and frequencies from 1 Hz to 1 MHz. The electrical conductivity of both samples was thermally activated with potential barriers of 0.55 eV and 0.59 eV, respectively. Doped samples had bigger complex dielectric constants and [Formula: see text] exhibited slightly steeper temperature dependence than in the pure sample. The dielectric relaxation was observed in pure and doped single crystals and relaxation frequencies showed similar activation energies as electrical conductivities.

scholarly journals A review of thermoelectric ZnO nanostructured ceramics for energy recovery

2018 ◽  
Vol 7 (2.29) ◽  
pp. 27 ◽  
Author(s):  
Mohammed M A ◽  
Izman Sudin ◽  
Alias Mohd Noor ◽  
Srithar Rajoo ◽  
Uday M B ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Thermoelectric Materials ◽  
Elevated Temperatures ◽  
Waste Heat ◽  
Electrical Energy ◽  
Ceramic Materials ◽  
Good Reliability ◽  
Recovery Potential ◽  
High Carrier ◽  
Thermal Conductivities

The thermoelectric devices have the ability to convert heat energy into electrical energy without required moving components, having good reliability however their performance depends on material selections. The advances in the development of thermoelectric materials have highlighted to increase the technology’s energy efficiency and waste heat recovery potential at elevated temperatures. The fabrication of these thermoelectric materials depends on the type of these materials and the properties using to evaluate these kind of materials such as thermopower (Seebeck effect), electrical and thermal conductivities. Ceramic thermoelectric materials have attracted increased attention as an alternative approach to traditional thermoelectric materials.  From these important thermoelectric ceramic materials that can be a candidate for n-type is ZnO doping, which have excellent thermal and chemical stability, as they are promising for high temperature power generator. This review is an effort to study the thermoelectric properties and elements doping related with zinc oxide nano-ceramic materials. Effective ZnO dopants and doping strategies to achieve high electrical and thermal conductivities and high carrier concentration are highlighted in this review to enable the advanced zinc oxide applications in thermoelectric power generation. 

Thermal Conductivity Reduction Paths in Thermoelectric Materials

2009 ◽  
Vol 1166 ◽  
Author(s):  
Claude Godart ◽  
Antonio Goncalves ◽  
Elsa Lopes ◽  
Benjamin Villeroy
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Essential Element ◽  
Complex Structures ◽  
Nano Structure ◽  
Structured Systems ◽  
Large Size ◽  
Plasma Sintering ◽  
Spark Plasma

AbstractThe figure of merit ZT = sS2T/k (S the Seebeck coefficient, s and k the electrical and thermal conductivity respectively) is an essential element of the efficiency of a thermoelectric material for applications which convert heat to electricity or, conversely, electric current to cooling. From the expression of the power factor sS2 it was deduced that a highly degenerated semiconductor is necessary. In order to reduce the lattice part of the thermal conductivity, various mechanisms were tested in new thermoelectric materials and those had been the topics of several reviews. These include cage-like materials, effects of vacancies, solid solutions, complex structures (cluster, tunnel, …,), micro- and nano-structured systems, and more recently semiconducting glasses. We plan to review such aspects in the modern thermoelectric materials and include results of the very last years. Moreover, as micro- and nano-composites seem to be promising to increase ZT in large size samples, we will also briefly discuss the interest of spark plasma sintering technique to preserve the micro- or nano- structure in highly densified samples.

Sign in / Sign up

Export Citation Format

Share Document