Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)最新文献

Solid-state synthesis of single-phase Zn/sub 4/Sb/sub 3/ bulk sample on the route of the bulk mechanical alloying 固体机械合金化法制备单相Zn/sub - 4/Sb/sub - 3/ bulk样品

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-12-01 DOI: 10.1109/ICT.1999.843361

T. Aizawa, Y. Iwaisako, K.-I. Fukagawa, A. Yamamoto, T. Ohta

引用次数: 3

High performance production of Bi/sub 2/Te/sub 3/ based thermoelectric materials on the route of the bulk mechanical alloying method 采用本体机械合金化方法制备高性能Bi/sub / 2/Te/sub / 3基热电材料

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-12-01 DOI: 10.1109/ICT.1999.843376

Y. Iwaisako, T. Aizawa, A. Yamamoto, T. Ohta

{"title":"High performance production of Bi/sub 2/Te/sub 3/ based thermoelectric materials on the route of the bulk mechanical alloying method","authors":"Y. Iwaisako, T. Aizawa, A. Yamamoto, T. Ohta","doi":"10.1109/ICT.1999.843376","DOIUrl":"https://doi.org/10.1109/ICT.1999.843376","url":null,"abstract":"In the commercial fabrication of thermoelectric materials, melting, ingot-making, pulverizing and sintering are fundamental steps for production. In the present new production method on the route of bulk mechanical alloying, the elemental constituent granules or agglomerates with any selected composition can be used for direct solid-state synthesis into single or dual phase thermoelectric materials. The Bi-Te-Sb system is adopted as the target thermoelectric material to investigate the effect of fine-grained structure on the figure of merit. In addition, temperature and pressure conditions in hot pressing are widely varied to describe the effect of process parameters on the thermoelectric properties. As a rough sketch of high performance in this processing, 3.6 ks for fabrication of green compact with the relative density of 85% T.D., 3.6 ks for hot pressing to have fine grain size in 1/spl sim/2 /spl mu/m for high density of 99% T.D. or more, and Z=3.15/spl times/10/sup -3//K in p-type Bi-Te system for the highest figure of merit.","PeriodicalId":253439,"journal":{"name":"Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115028547","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

Transport properties of tin clathrates 锡包合物的输运性质

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-12-01 DOI: 10.1109/ICT.1999.843438

G. Nolas, J. Cohn, E. Nelson

引用次数: 1

Artificially ordered BiSb alloys: growth and transport properties 人工有序铋合金:生长和输运特性

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-12-01 DOI: 10.1109/ICT.1999.843344

Sunglae Cho, Yunki Kim, A. DiVenere, G. Wong, A. Freeman, J. Ketterson, L. Olafsen, I. Vurgaftman, J. R. Meyer, C. Hoffman

引用次数: 0

Anisotropic Seebeck and magneto-Seebeck coefficients of Bi and BiSb alloy thin films Bi和BiSb合金薄膜的各向异性塞贝克系数和磁塞贝克系数

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-12-01 DOI: 10.1109/ICT.1999.843369

Sunglae Cho, Yunki Kim, A. DiVenere, G. Wong, J. Ketterson, J. R. Meyer

引用次数: 2

The alkali metal thermal-to-electric converter for Solar System exploration 用于太阳系探索的碱金属热电转换器

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-09-08 DOI: 10.1109/ICT.1999.843468

M. Ryan

{"title":"The alkali metal thermal-to-electric converter for Solar System exploration","authors":"M. Ryan","doi":"10.1109/ICT.1999.843468","DOIUrl":"https://doi.org/10.1109/ICT.1999.843468","url":null,"abstract":"AMTEC, the Alkali Metal Thermal to Electric Converter, is a direct thermal to electric energy conversion device; it has been demonstrated to perform at high power densities, with open circuit voltages in single electrochemical cells up to 1.6 V and current densities up to 2.0 A/cm/sup 2/. It is a sodium concentration cell which uses a /spl beta/\"-alumina solid electrolyte (BASE) tube as a separator between a high pressure region containing liquid sodium at 900-1300 K and a low pressure region containing a condenser at 400-700 K. As a power system, AMTEC is expected to deliver /spl sim/20 W/kg with a 15-20% thermal to electric conversion efficiency. AMTEC has been baselined as the power conversion system for the Ice and Fire missions in NASA's X2000 Program and is being developed as part of the NASA/DoE Advanced Radioisotope Power Systems Program. This paper discusses the basic operating principles of AMTEC as well as the evolution of design and materials selection for power converters for spacecraft in the X2000 program. Life and degradation studies of AMTEC cells and converters are underway at JPL and are considered in this paper.","PeriodicalId":253439,"journal":{"name":"Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114628865","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: 3

Magnetoresistance technique for determining cross-plane mobility in superlattice devices 测定超晶格器件中跨平面迁移率的磁阻技术

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-09-01 DOI: 10.1109/ICT.1999.843477

S. Johnston, R. Ahrenkiel, D. Young, R. Venkatasubramanian

{"title":"Magnetoresistance technique for determining cross-plane mobility in superlattice devices","authors":"S. Johnston, R. Ahrenkiel, D. Young, R. Venkatasubramanian","doi":"10.1109/ICT.1999.843477","DOIUrl":"https://doi.org/10.1109/ICT.1999.843477","url":null,"abstract":"The cross-plane mobility, in the direction perpendicular to the planes of a superlattice, is critical for the computation of the figure of merit (ZT) in a thermoelectric device. The measurement of cross-plane mobilities in thermoelectric superlattice structures cannot be performed by conventional techniques such as the van der Pauw method. Therefore, alternative techniques must be used to obtain this important parameter. Magnetoresistance is the increase in material resistivity due to a lengthened path for charge carriers in a perpendicular magnetic field. The magnetoresistance is related to the magnetic field strength as (/spl mu/B)/sup 2/ in the standard configuration, but the field dependence is also influenced by device geometry. This work focuses on measuring superlattice samples of composition Bi/sub 2/Te/sub 3//Sb/sub 2/Te/sub 3/ that are removed from their growth substrate and mounted on metal-coated substrates. This resulting mesa structure has a 100 /spl mu/m-square contact metallization. Technical issues related to the sample preparation for the measurement are discussed. The magnetoresistance effect is expected to be small due to the anticipated low mobilities in Bi/sub 2/Te/sub 3/-based materials. Magnetoresistance studies with such superlattice thermoelements were attempted using a dc magnetic field, but the sensitivity was insufficient. An ac magnetoresistance with lock-in detection can yield improved sensitivity.","PeriodicalId":253439,"journal":{"name":"Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126747548","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

Development of a high efficiency thermoelectric unicouple for power generation applications 发电用高效率热电单偶的研制

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-08-30 DOI: 10.1109/ICT.1999.843433

T. Caillat, J. Fleurial, G. Snyder, A. Zoltan, D. Zoltan, A. Borshchevsky

{"title":"Development of a high efficiency thermoelectric unicouple for power generation applications","authors":"T. Caillat, J. Fleurial, G. Snyder, A. Zoltan, D. Zoltan, A. Borshchevsky","doi":"10.1109/ICT.1999.843433","DOIUrl":"https://doi.org/10.1109/ICT.1999.843433","url":null,"abstract":"To achieve high thermal-to-electric energy conversion efficiency, it is desirable to operate thermoelectric generator devices over large temperature gradients and also to maximize the performance of the thermoelectric materials used to build the devices. However, no single thermoelectric material is suitable for use over a very wide range of temperatures (/spl sim/300-1000 K). It is therefore necessary to use different materials in each temperature range where they possess optimum performance. This can be achieved in two ways: (1) multistage thermoelectric generators where each stage operates over a fixed temperature difference and is electrically insulated but thermally in contact with the other stages; and (2) segmented generators where the p- and n-legs are formed of different segments joined in series. The concept of integrating new thermoelectric materials into a segmented thermoelectric unicouple has been introduced in earlier publications. This new unicouple is expected to operate over a 300-973 K temperature difference and will use novel segmented legs based on a combination of state-of-the-art thermoelectric materials and novel p-type Zn/sub 4/Sb/sub 3/, p-type CeFeSb/sub 12/-based alloys and n-type CoSb/sub 3/-based alloys. A conversion efficiency of about 15% is predicted for this new unicouple. We present the latest experimental results from the fabrication of this unicouple, including bonding studies between the different segments of the p-legs, n-legs, and p-leg to n-leg interconnect. Thermal and electrical tests of the unicouple are in progress and are briefly described.","PeriodicalId":253439,"journal":{"name":"Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132503062","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: 44

Thermoelectric properties of new Zintl phases: Ba/sub 4/In/sub 8/Sb/sub 16/ and Ba/sub 6/Ge/sub 25-x/ 新Zintl相:Ba/sub 4/In/sub 8/Sb/sub 16/和Ba/sub 6/Ge/sub 25-x/的热电性能

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-08-29 DOI: 10.1109/ICT.1999.843359

Sung‐Jin Kim, Wei Chen, C. Uher, H.G. Kanatzidis

{"title":"Thermoelectric properties of new Zintl phases: Ba/sub 4/In/sub 8/Sb/sub 16/ and Ba/sub 6/Ge/sub 25-x/","authors":"Sung‐Jin Kim, Wei Chen, C. Uher, H.G. Kanatzidis","doi":"10.1109/ICT.1999.843359","DOIUrl":"https://doi.org/10.1109/ICT.1999.843359","url":null,"abstract":"A new compound Ba/sub 4/In/sub 8/Sb/sub 16/ is being explored for thermoelectric potential. It crystallizes in the orthorhombic space group Pnma with a=10.166(3) /spl Aring/, b=4.5239(14) /spl Aring/, c=19.495(6) /spl Aring/, and Z=1. Ba/sub 4/In/sub 8/Sb/sub 16/ has a 2-dimensional structure with thick corrugated (In/sub 8/Sb/sub 16/)/sup 8$/layers separated by Ba ions. The compound is a narrow band-gap (/spl sim/0.10 eV) semiconductor. Polycrystalline ingots of Ba/sub 4/In/sub 8/Sb/sub 16/ show room temperature electrical conductivity of 135 S/cm and a Seebeck coefficient of 70 /spl mu/V/K. The thermal conductivity of Ba/sub 4/Ln/sub 8/Sb/sub 16/ is about 1.7 W/m/spl middot/K in the temperature range of 150-300 K. The new compound Ba/sub 6/Ge/sub 25-x/ was also examined. Ba/sub 6/Ge/sub 25-x/ adopts chiral clathrate structure with cubic space group P4/sub 1/32 and dimension of a=14.5483(2) /spl Aring/. Ba/sub 6/Ge/sub 25-x/ shows room temperature electrical conductivity of 2000 S/cm and a Seebeck coefficient of -18 /spl mu/V/K. The thermal conductivity was about 2.5 W/m/spl middot/K at room temperature. Both of the compounds reported here are air and moisture stable.","PeriodicalId":253439,"journal":{"name":"Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115125794","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

Lattice dynamics and LDA calculations for LaFe/sub 4/Sb/sub 12/ lfe /sub 4/Sb/sub 12/的晶格动力学和LDA计算

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-08-29 DOI: 10.1109/ICT.1999.843322

J. Feldman, D. J. Singh, I. Mazin

{"title":"Lattice dynamics and LDA calculations for LaFe/sub 4/Sb/sub 12/","authors":"J. Feldman, D. J. Singh, I. Mazin","doi":"10.1109/ICT.1999.843322","DOIUrl":"https://doi.org/10.1109/ICT.1999.843322","url":null,"abstract":"We perform first principles calculations of the total energy and Hellmann Feynman forces generated by displacements of the La atom as well as by other atoms of the filled skutterudite LaFe/sub 4/Sb/sub 12/ within the LAPW method. Assuming short ranged interatomic forces we thereby evaluate the force constant matrix between La and Fe and between La and Sb. The strongest interactions are central bond stretching and that force constant is positive for the La-Sb interaction and negative for the La-Fe interaction. The potential seen by a La atom in the fixed environment of Sb and Fe atoms is found to be quite harmonic for energies even corresponding to T somewhat greater than room temperature, and the quartic term is positive and hence constraining. By incorporating the LDA information into a lattice dynamical model for CoSb/sub 3/ the two peak structure discovered in an analysis of inelastic neutron scattering data is explained. The specific heat is also calculated and found to disagree with previous experimental results, but those results have recently been superseded by other experimental results that agree with our calculations.","PeriodicalId":253439,"journal":{"name":"Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127269244","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