Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589)最新文献_第2页

Thermoelectric properties of oxides Ca/sub 2/Co/sub 2/O/sub 5/ with Cr substitution Cr取代Ca/sub 2/Co/sub 2/O/sub 5/氧化物的热电性能

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI: 10.1109/ICT.2001.979864

M. Miyata, Y. Fujishiro, M. Awano

{"title":"Thermoelectric properties of oxides Ca/sub 2/Co/sub 2/O/sub 5/ with Cr substitution","authors":"M. Miyata, Y. Fujishiro, M. Awano","doi":"10.1109/ICT.2001.979864","DOIUrl":"https://doi.org/10.1109/ICT.2001.979864","url":null,"abstract":"In recent years, oxide ceramics, such as NaCoO, Ca/sub 2/Co/sub 2/O/sub 5/ have attracted significant research interest for their prominent thermoelectric properties. In this paper, we investigated the high temperature thermoelectric properties of Ca/sub 2/Co/sub 2/O/sub 5/ with Cr substitution. CaCO/sub 3/,Co/sub 3/O/sub 4/ and Cr/sub 2/O/sub 3/ powders were used as the starting mixture. These powders were mixed by ball milling and sintered by a pulsed electric current sintering method (PECS) in Ar gas atmosphere. Both the electrical conductivity and Seebeck coefficient of the sintered bodies were simultaneously measured in He gas atmosphere from room temperature up to 1000 K. The electrical conductivity of Ca/sub 2-x/Cr/sub x/Co/sub 2/O/sub 5/ increased with increasing Cr content and reached a peak at x=0.3. The Seebeck coefficients of all the sintered bodies are positive, indicating p-type materials. The power factor of Ca/sub 2-x/Cr/sub x/Co/sub 2/O/sub 5/ increased with increasing Cr content, and the sample with x=0.3 showed the highest power factor 2.9 /spl times/ 10/sup -4/ W/mK/sup 2/ at 800/spl deg/C.","PeriodicalId":203601,"journal":{"name":"Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123354369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and annealing effects of large sized ingot of n-type CoSb/sub 3/ n型CoSb/ sub3 /大尺寸铸锭的制备及退火效果

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI: 10.1109/ICT.2001.979828

R. Hara, K. Tomita, S. Inoue, H. Kaibe, H. Mizukami

引用次数: 0

Production of thermoelectric materials by mechanical alloying - extrusion process 用机械合金化-挤压法生产热电材料

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI: 10.1109/ICT.2001.979840

J. Simard, D. Vasilevskiy, F. Belanger, J. L'ecuyer, S. Turenne

{"title":"Production of thermoelectric materials by mechanical alloying - extrusion process","authors":"J. Simard, D. Vasilevskiy, F. Belanger, J. L'ecuyer, S. Turenne","doi":"10.1109/ICT.2001.979840","DOIUrl":"https://doi.org/10.1109/ICT.2001.979840","url":null,"abstract":"The extrusion process offers one of the greatest prospects for the industrial production of Bi/sub 2/Te/sub 3/-based thermoelectric alloys. When coupled with mechanical alloying, this process promises substantial cost savings because of its ability to deliver net shape components, leading to a reduction in the so-called kerf losses and higher material yields. It is also well known that materials produced using one of the various powder processing routes have greater mechanical strength when compared to conventionally grown alloys, leading to an improved reliability. We have produced both p-type (Bi/sub 2-x/Sb/sub x/Te/sub 3/) and n-type (Bi/sub 2/Te/sub 3-y/Se/sub y/) alloys using mechanical alloying and extrusion and have studied the structure, composition and thermoelectric properties of these alloys. By carefully controlling every step of the process we have found that it is possible to produce rods of thermoelectric material, for both p- and n-type alloys, which have good properties. Figures of merit of up to 3.35 /spl times/ 10/sup -3/ K/sup -1/ for p-type alloys and 2.8 /spl times/ 10/sup -3/ K/sup -1/ for n-type alloys have been obtained. A fivefold improvement in the mechanical properties over conventional melt grown material has also been observed.","PeriodicalId":203601,"journal":{"name":"Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121551972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Electrical transport measurements and electronic structure calculations on doped half-Heusler FeVSb 掺杂半heusler FeVSb的电输运测量和电子结构计算

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI: 10.1109/ICT.2001.979878

L. Jodin, J. Toboła, P. Pécheur, H. Scherrer

{"title":"Electrical transport measurements and electronic structure calculations on doped half-Heusler FeVSb","authors":"L. Jodin, J. Toboła, P. Pécheur, H. Scherrer","doi":"10.1109/ICT.2001.979878","DOIUrl":"https://doi.org/10.1109/ICT.2001.979878","url":null,"abstract":"Structural and electrical transport properties of pure and doped FeVSb half-Heusler phases were investigated from X-ray diffraction, Mossbauer spectroscopy, resistivity and thermopower measurements. The doping elements were Ti, Zr, Mn and Co. Electronic structures calculations of experimental samples were carried out using Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA) method within the LDA framework. We observed that the room temperature Seebeck coefficient changed from highly negative in FeV/sub 0.98/Mn/sub 0.02/Sb (-190 /spl mu/V/K) to highly positive in FeV/sub 0.85/Ti/sub 0.15/Sb (+140 /spl mu/V/K), being also negative in FeVSb. Except for Fe/sub 0.98/Co/sub 0.02/VSb, all investigated samples exhibit either semiconducting or semimetallic behaviors of resistivity curves. From band structure calculations FeVSb exhibits a narrow band gap (E/sub g/=0.45 eV) at E/sub F/. However, as deduced from the KKR-CPA calculations, a small disorder in FeVSb may substantially modify electronic structure in the vicinity of EF, leading into an energy gap closing. Total energy analysis allowed estimating lattice parameter variation with doping as well as a site preference of substituted atoms in the FeVSb host. Densities of states of Ti, Zr, Mn and Co impurities in FeVSb were computed. The others dopants, Mn impurity in FeVSb form a huge peak in the gap, which can be responsible for unusual transport properties of this system.","PeriodicalId":203601,"journal":{"name":"Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125481043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

One-dimensional modeling of a Peltier element Peltier元素的一维建模

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI: 10.1109/ICT.2001.979925

W. Seifert, M. Ueltzen, C. Strumpel, W. Heiliger, E. Muller

{"title":"One-dimensional modeling of a Peltier element","authors":"W. Seifert, M. Ueltzen, C. Strumpel, W. Heiliger, E. Muller","doi":"10.1109/ICT.2001.979925","DOIUrl":"https://doi.org/10.1109/ICT.2001.979925","url":null,"abstract":"For dimensioning and optimum control of Peltier coolers and heat pumps, an accurate numerical description of the performance parameters under various operation conditions is required. Here, the situation for homogeneous bismuth antimony telluride based Peltier cooler material is discussed, using representative values of constant material parameters in comparison to real experimental data of the temperature dependence of the thermoelectric properties. For the case of a constant pellet cross section, given pellet length and neglecting heat transfer aside, the problem can be treated as one-dimensional. The relation between electric current density j, temperature difference /spl utri/T, and absorbed cooling power or COP, respectively, along a single Peltier element have been considered by ab-initio calculations and plotted for the entire two-dimensional range (over j and /spl utri/T) of relevant operating conditions, assuming constant material properties. Accordingly, the spatial temperature distribution inside the thermoelectric material has been calculated. Differential equations governing thermoelectric transports have been analytically and numerically solved by the software tool MATHEMATICA. This instrument is capable of solving the inhomogeneous second order differential equation for the temperature profile even for nonconstant coefficients with mixed boundary conditions provided. Thus, exact temperature profiles along the pellet can be easily calculated taking into account the correct temperature dependence of the material properties. The maximum temperature difference has been determined for arbitrarily given cooling power or COP, respectively, including zero temperature difference and adiabatic cold side (/spl Delta/T/sub max/) cases. Evidence is provided for a very good quantitative agreement between /spl Delta/T/sub max/ values calculated using real temperature dependent material properties or volume averaged constant values.","PeriodicalId":203601,"journal":{"name":"Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589)","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132395183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 36

Multiscale approaches to thermoelectric materials and devices 热电材料和器件的多尺度方法

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI: 10.1109/ICT.2001.979610

C. Nan, Junbo Wu, J. Nan, Xisong Zhou, Jianzhong Zhang

引用次数: 6

Preparation and thermoelectric properties of polyaniline/NaFe/sub 4/P/sub 12/ composite 聚苯胺/NaFe/sub 4/P/sub 12/复合材料的制备及其热电性能

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI: 10.1109/ICT.2001.979904

Hong Liu, Ji-yang Wang, Xia Hui, Huaidong Jiang, Shanrong Zhao, Qiang Li, R. Boughton, M. Jiang

引用次数: 0

Martensitic transformations studied by the measurement of thermoelectric properties 通过测量热电性质研究马氏体相变

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI: 10.1109/ICT.2001.979939

I. Yoshida, T. Ono, K. Ino, D. Monma, M. Asai

引用次数: 2

High-temperature thermoelectric properties of Na/sub x/CoO/sub 2-/spl delta// single crystals Na/sub x/CoO/sub 2-/spl δ //单晶的高温热电性质

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI: 10.1109/ICT.2001.979851

K. Fujita, T. Mochida, K. Nakamura

{"title":"High-temperature thermoelectric properties of Na/sub x/CoO/sub 2-/spl delta// single crystals","authors":"K. Fujita, T. Mochida, K. Nakamura","doi":"10.1109/ICT.2001.979851","DOIUrl":"https://doi.org/10.1109/ICT.2001.979851","url":null,"abstract":"The thermoelectric properties of Na/sub x/CoO/sub 2-/spl delta// single crystal have been evaluated at high temperatures (300<T< 800 K) for the first time. The Na/sub x/CoO/sub 2-/spl delta// single crystals are prepared by a flux technique, and the flaky single crystals are very thin on the c-axis. The in-plane electrical resistivity (/spl rho/), the thermoelectric power (S) and the in-plane thermal conductivity (/spl kappa/) are measured in the range of 300 K to 800 K. The estimated power factor (PF=S/sup 2//spl middot//spl rho//sup -1/) and the figure-of-merit (Z=S/sup 2//spl middot//spl rho//sup -1//spl kappa//sup -1/) are about 2.4 mWm/sup -1/ K/sup -2/ and 0.12 mK/sup -1/ at 300 K, respectively. These factors increase with temperature, and reach the value of PF=7.7 mWm/sup -1/ K/sup -2/ and Z=1.5 mK/sup -1/ at 800 K, and the dimensionless value of ZT exceeds the criterion of 1. The PF and Z exceed the values of typical \"high temperature thermoelectric materials\". These results suggest that Na/sub x/CoO/sub 2-/spl delta// could be a very promising material for use in the high-temperature thermoelectric power generation devices.","PeriodicalId":203601,"journal":{"name":"Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115478474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Quantum chemistry calculation and transport of Bi/sub 2/Te/sub 3/ and Sb/sub 2/Te/sub 3/ Bi/sub 2/Te/sub 3/和Sb/sub 2/Te/sub 3/的量子化学计算与输运

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI: 10.1109/ICT.2001.979847

X. Min, J. An, K. Cai, Shenlin Chen, C. Nan

引用次数: 0