Transport Properties Of Doped CsBi4Te6 Thermoelectric Materials

1998 ◽  
Vol 545 ◽  
Author(s):  
Paul W. Brazis ◽  
Melissa Rocci ◽  
Duck-Young Chung ◽  
Mercouri G. Kanatzidis ◽  
Carl R. Kannewurf
Keyword(s):  
Transport Properties ◽  
Power Factor ◽  
Thermoelectric Materials ◽  
Material Characterization ◽  
Doping Concentration ◽  
Maximum Power ◽  
Maximum Value ◽  
Characterization Studies ◽  
Maximum Power Factor ◽  
Optimum Doping Concentration

AbstractIn previous investigations we have introduced a variety of new chalcogenide-based materials with promising properties for thermoelectric applications. The chalcogenide CsBi4Te6 was previously reported to have a high ZT product with a maximum value at 260K. In order to improve this value, a series of doped CsBi4Te6 samples has been synthesized. Current doping studies have been very encouraging, with one sample found to have a maximum power factor of 51.5 μW/cm·K2 at 184 K. This paper reports on material characterization studies through the usual transport measurements to determine optimum doping concentration for various dopants.

Doping Studies of n-Type CsBi4Te6 Thermoelectric Materials

2000 ◽  
Vol 626 ◽  
Author(s):  
Melissa A. Lane ◽  
John R. Ireland ◽  
Paul W. Brazis ◽  
Theodora Kyratsi ◽  
Duck-Young Chung ◽  
...  
Keyword(s):  
Power Factor ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Doping Concentration ◽  
High Figure ◽  
P Type ◽  
Optimum Doping Concentration

ABSTRACTWe have previously reported the successful p-type doping of CsBi4Te6 which had a high figure of merit at temperatures below 300 K. In this study, several dopants were explored to make n-type CsBi4Te6. A program of measurements was performed to identify the optimum doping concentration for several series of dopants. The highest power factors occurred around 125 K for the 0.5% Sn doped CsBi4Te6 sample which had a power factor of 21.9 μW/cm•K2 and 1.0% Te doped CsBi4Te6 which had a power factor of 21.7 μW/cm•K2.

Electronic structure and electrical transport properties of MoS2 single-walled nanotubes based on first principles

2021 ◽  
Author(s):  
Wen Yang ◽  
Lili Wang ◽  
Yiming Mi ◽  
Guanghong Zhong ◽  
Qiuju Ma ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Transport Properties ◽  
Power Factor ◽  
Electrical Transport ◽  
Maximum Power ◽  
Boltzmann Transport ◽  
Electrical Transport Properties ◽  
Text Type ◽  
Maximum Power Factor ◽  
Transport Method

The work theoretically calculated the electronic structure and electrical transport properties of two configurations of single-walled MoS2 nanotubes: armchair nanotubes (ANTs) and zigzag nanotubes (ZNTs) based on the density functional theory and Boltzmann transport method. ANTs have an indirect one. while ZNTs have a direct bandgap structure. The Seebeck coefficient ([Formula: see text]), electrical conductivity ([Formula: see text] and power factor ([Formula: see text] were calculated as a function of carrier concentration, chemical potential and temperature using the Boltzmann transport method. The calculated power factor ([Formula: see text]) indicates that the most promising electronic properties were exhibited by [Formula: see text]-type ANTs and [Formula: see text]-type ZNTs. The [Formula: see text] of narrow bandgap (6, 6) (7, 7) (8, 8) semiconductors reached [Formula: see text], [Formula: see text] and [Formula: see text]WK[Formula: see text]m[Formula: see text] at room-temperature, respectively. (7, 7) nanotube have a maximum power factor of [Formula: see text]WK[Formula: see text]m[Formula: see text] at 950 K, and the maximum power factor of ANTs is almost twice that of ZNTs.

Thermoelectric Properties of CoSb3 Nanoparticle Films

2011 ◽  
Vol 347-353 ◽  
pp. 3448-3455
Author(s):  
Ya Jun Yang ◽  
Xian Yun Liu ◽  
Xu Dong Wang ◽  
Mei Ping Jiang ◽  
Xian Feng Chen ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Power Factor ◽  
Room Temperature ◽  
Maximum Power ◽  
Vapor Transport ◽  
Growth Technique ◽  
Highly Efficient ◽  
Nanoparticle Films ◽  
Electrical Conductivities ◽  
Maximum Power Factor

Cobblestone-like CoSb3 nanoparticle films have been achieved via a catalyst-free vapor transport growth technique. The thermoelectric properties of the nanoparticle films were measured from room temperature to around 500 oC. The resultant CoSb3 nanoparticle films show high electrical conductivities due to clean particle surfaces. A maximum power factor reaches 1.848×10−4 W/mK2 at 440 oC. The discussed approach is promising for realizing new types of highly efficient thermoelectric semiconductors.

Microwave-assisted synthesis of Bi2Se3ultrathin nanosheets and its electrical conductivities

CrystEngComm ◽  
2014 ◽  
Vol 16 (19) ◽  
pp. 3965-3970 ◽  
Author(s):  
Haiming Xu ◽  
Gang Chen ◽  
Rencheng Jin ◽  
Dahong Chen ◽  
Yu Wang ◽  
...  
Keyword(s):  
Power Factor ◽  
Microwave Power ◽  
Maximum Power ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Electrical Conductivities ◽  
Maximum Power Factor

Ultrathin Bi2Se3nanosheets (30 nm) have been successfully fabricated with 1 kW microwave power for 1 minute. The maximum power factor of the sample can reach up to 157 μW m−1K−2at 523 K, which is larger than the samples with thicknesses ranging from 50 nm to 100 nm.

THE THEORY OF SOME A-C. COMMUTATOR MOTORS WITH SERIES CHARACTERISTICS: I. THE REPULSION MOTOR

1942 ◽  
Vol 20a (5) ◽  
pp. 49-70
Author(s):  
E. G. Cullwick
Keyword(s):  
Power Factor ◽  
Maximum Power ◽  
Experimental Results ◽  
Finite Speed ◽  
Three Phase ◽  
Maximum Power Factor ◽  
Starting Torque ◽  
General Method

A general method, using "full reactances", is applied for developing the theory of the simple repulsion motor, the compensated repulsion motor, and the three-phase series motor. The effect of the currents induced in the armature turns short-circuited by the brushes is included, and is shown to affect profoundly the operation of the motors. Graphical constructions for the current loci are given, together with methods of measuring the various reactances, and of accounting for the effect of saturation. Experimental results for a three-phase series motor are included and compared with calculated values.Part I, published below, deals with the simple repulsion motor. Neglecting the effects of the coils short-circuited by the brushes, the usual well known results are obtained, and the position of the brushes for maximum starting torque is studied. The currents circulating in the coils short-circuited by the brushes are then found to have the following effects:(a) The performance of the motor, for a given current, is improved at speeds below synchronism, and is impaired at speeds above synchronism.(b) The maximum power factor is found to occur at some finite speed, whereas, if the effect of the short-circuited coils is neglected the power factor is a maximum at infinite speed.(c) The no-load speed is considerably lower than that usually associated with series motors.The rise and fall of the currents in the coils short-circuited by the brushes is studied in the Appendix.

Enhanced power factor in the promising thermoelectric material SnPbxTe prepared via zone-melting

RSC Advances ◽  
2015 ◽  
Vol 5 (73) ◽  
pp. 59379-59383 ◽  
Author(s):  
Jun He ◽  
Jingtao Xu ◽  
Guoqiang Liu ◽  
Xiaojian Tan ◽  
Hezhu Shao ◽  
...  
Keyword(s):  
Thermoelectric Material ◽  
Power Factor ◽  
Zone Melting ◽  
Maximum Power ◽  
Melting Method ◽  
Tin Telluride ◽  
Maximum Power Factor

Tin telluride (SnTe) has recently attracted much attention as a promising thermoelectric material. By alloying with Pb using a zone-melting method, the maximum power factor of SnTe alloys reaches 30.5 μW cm−1 K−2, and a ZT of 0.81 has been obtained.

Sign in / Sign up

Export Citation Format

Share Document