2006 25th International Conference on Thermoelectrics最新文献_第3页

Crystallographic Constitution and the Thermoelectric Properties of Mixed Layered Tetradymite-like Ternary Compounds 混合层状四白石状三元化合物的晶体结构和热电性质

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI: 10.1109/ICT.2006.331254

L. E. Shelimova, T. E. Svechnikova, P. Konstantinov, O. G. Karpinsky, E. S. Avilov, M. Kretova, V. Zemskov

{"title":"Crystallographic Constitution and the Thermoelectric Properties of Mixed Layered Tetradymite-like Ternary Compounds","authors":"L. E. Shelimova, T. E. Svechnikova, P. Konstantinov, O. G. Karpinsky, E. S. Avilov, M. Kretova, V. Zemskov","doi":"10.1109/ICT.2006.331254","DOIUrl":"https://doi.org/10.1109/ICT.2006.331254","url":null,"abstract":"The existence of the n-type nPbTemiddotmBi2Te3 and p-type nPbTemiddotmSb2Te3 homologous series compounds is found in the PbTe-Bi2Te3 and PbTe-Sb2Te3 systems by X-ray diffraction. The structures of the ternary compounds are formed by multilayer packets alternating orderly along a hexagonal \"c\" axis. In these layered structures, the bonding within the multi-layer packets has ionic-covalent character, while bonds between the packets are preferentially achieved by weak van der Waals forces. Such difference in the character of chemical bonding stipulates the anisotropy of crystal lattice and strongly marked cleavage planes. The anisotropy in thermoelectric properties has been studied in the n-type PbBi4Te7 and p-type PbSb2Te4 single crystals grown by Czochralski technique. The considerable anisotropy in thermoelectric properties (especially in PbSb2Te4) is discovered in the crystals by their measurement parallel and perpendicular to a hexagonal \"c\" axis. The lattice thermal conductivity measured parallel to \"c\" axis (kappa33) is much smaller than that measured in perpendicular to \"c\" axis direction (kappa11). Apparently, it is related to effective scattering of phonons by the potential barriers at the boundaries of the slabs, separated by van der Waals gaps","PeriodicalId":346555,"journal":{"name":"2006 25th International Conference on Thermoelectrics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115552976","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: 1

Thermopower of ruthenium metallic oxides: Large influence of the spin degeneracy term 钌金属氧化物的热能:自旋简并项的影响

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI: 10.1109/ICT.2006.331215

S. Hébert, Y. Klein, A. Maignan, J. Hejtmánek, B. Dabrowski

引用次数: 2

Flash Evaporated Thin Films of Bismuth Telluride 闪蒸碲化铋薄膜

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI: 10.1109/ICT.2006.331390

K. Miyazaki, T. Shirakawa, H. Tsukamoto

{"title":"Flash Evaporated Thin Films of Bismuth Telluride","authors":"K. Miyazaki, T. Shirakawa, H. Tsukamoto","doi":"10.1109/ICT.2006.331390","DOIUrl":"https://doi.org/10.1109/ICT.2006.331390","url":null,"abstract":"In this study, thermoelectric thin films are deposited on glass plates by using a flash evaporation method. We evaporated fine powders of 20% Bi2Te3-80% Sb2Te3 as a p-type and those of 90% Bi2Te3-10% Bi2Se3 as an n-type. We measured thermoelectric properties, such as Seebeck coefficient, alpha, the electrical resistivity, rho, and thermal conductivity, lambda, at room temperature. Flash evaporated p-type thin films show high values of thermoelectric properties: alpha = 199 muV/K, and rho = 14 mOmegamiddotcm at 300 K, and the n-type thin films show alpha = -30 muV/K, and rho = 3 mOmegamiddotcm. The fabricated thin films are annealed at 200 to 400 degC for 1 hour in argon for the improvement of the thermoelectric properties. The electrical resistivity of the p-type thin films reduces as annealing temperature increases, and it reaches 1.8 mOmegamiddotcm at annealing temperature of 400 degC. Seebeck coefficient of the thin films reaches 218 muV/K at annealing temperature of 300 degC. On the other hand, the electrical resistivity of the n-type thin films reduces to 2 mOmegamiddotcm at annealing temperature of 350 degC, and Seebeck coefficient of the thin films increases to -163 muV/K at annealing temperature of 300 degC. The measured thermal conductivity of an n-type thin film annealed at 200 degC is 1.2 W/(mmiddotK). EPMA measurements and SEM observations are carried out to consider the mechanisms of improvements of thermoelectric properties","PeriodicalId":346555,"journal":{"name":"2006 25th International Conference on Thermoelectrics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128702967","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

Synthesis of Ca3Co4O9 Ceramics by Citric Acid Complex and Hydrothermal Hot-pressing Processes and its Thermoelectric Properties 柠檬酸配合物-水热压法制备Ca3Co4O9陶瓷及其热电性能

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI: 10.1109/ICT.2006.331353

S. Katsuyama, M. Ito

引用次数: 2

Progress Towards Maximizing the Performance of a Thermoelectric Power Generator 实现热电发电机性能最大化的进展

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI: 10.1109/ICT.2006.331259

D. Crane, L. Bell

{"title":"Progress Towards Maximizing the Performance of a Thermoelectric Power Generator","authors":"D. Crane, L. Bell","doi":"10.1109/ICT.2006.331259","DOIUrl":"https://doi.org/10.1109/ICT.2006.331259","url":null,"abstract":"This paper describes the design, modeling, initial build and testing of a novel thermoelectric power generator (TPG), incorporating state of the art material technology with optimized thermal management. A numerical model simulates the operation of the device and facilitates its design. Advanced multi-parameter, gradient-based optimization techniques are used to better understand the interactions between various design variables and parameters in order to progress towards an optimal TPG design. The device, made up of a series of segmented elements each comprised of up to three different materials, combines thermal isolation in the direction of flow with high power density thermoelectric (TE) material integrated directly into the heat exchanger device. Electrical current runs parallel to the heat source and sink surfaces in the device, allowing the integration of the TE material with multiple geometric degrees of freedom. This design attribute coupled with the thermal isolation thermodynamic cycle, allows each element of the TE device to be optimized semi-independently. Each p- and n-type element can have different aspect ratios (cross-sectional area divided by thickness) so that each material layer of each element has the highest possible ZT for each temperature range. The increased design flexibility helps address TE material compatibility issues associated with segmented elements and fluid flow that ordinarily degrade performance. Eliminating the impact of thermal expansion mismatch while still maintaining excellent thermal and electrical contacts is also a design goal. Additional design considerations are also discussed, including electrical and thermal connector design and minimizing interfacial resistances. The device described is suitable for both waste heat recovery and primary power applications. Initial test results from prototype builds are discussed","PeriodicalId":346555,"journal":{"name":"2006 25th International Conference on Thermoelectrics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114219960","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: 50

Warm ECAE: a Novel Deformation Process for Optimising Mechanical and Thermoelectric Properties of Chalcogenides 热ECAE:一种优化硫族化合物机械和热电性能的新型变形工艺

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI: 10.1109/ICT.2006.331366

S. Ceresara, G. Giunchi, G. Ripamonti

引用次数: 3

Cooling Enhancement Using Inhomogeneous Thermoelectric Materials 利用非均匀热电材料增强冷却

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI: 10.1109/ICT.2006.331365

Z. Bian, A. Shakouri

引用次数: 10

Thermoelectric Power of Single Bi Microwires at Helium Temperatures 氦温度下单Bi微线的热电性能

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI: 10.1109/ICT.2006.331359

D. Gitsu, T. Huber, L. Konopko, A. Nikolaeva

{"title":"Thermoelectric Power of Single Bi Microwires at Helium Temperatures","authors":"D. Gitsu, T. Huber, L. Konopko, A. Nikolaeva","doi":"10.1109/ICT.2006.331359","DOIUrl":"https://doi.org/10.1109/ICT.2006.331359","url":null,"abstract":"The thermopower S has two contributions. Diffusion thermopower arises from a diffusion of charge carriers opposite to the temperature gradient; phonon drag thermopower results from a quasi-momentum transfer from the phonons to the charge carriers. The latter term is dominant at low temperatures, yields important information about phonon-wall scattering in nanostructures, and has been studied in confined systems such as two-dimensional electron gases and carbon nanotubes. The thermopower of monocrystalline Bi (pure and doped with Te or Sn) microwires with diameters ranging from 0.1 to 3 mum were measured in the temperature range 4-300 K. Samples of Bi nanowires that are monocrystalline were spun as a fiber by the high frequency liquid-phase casting method. The low-temperature diffusion thermopower of Bi is linear with temperature. Instead, the dominant feature of the thermopower at temperatures below 12 K is a peak, which is due to phonon drag. We observe that the phonon-drag thermopower depends on the wire diameter and increases with increasing diameter of the sample, which is qualitatively explained by the suppression of two-step phonon processes in the finer wires due to the shortening of the phonon mean free path for normal (momentum conserving) processes due to diffusive wall scattering [Gitsu, D, et. al., 2005]. We have also studied the dependence of the phonon drag peak with wire length. Thus we have observed considerable decreasing of the phonon drag in the short samples when the length of the samples is smaller than 1 mm. In this case only thick samples d = 2.5 and 1 mum have the appreciable positive peak at around ap5 K. A possible explanation of these experimental results is presented","PeriodicalId":346555,"journal":{"name":"2006 25th International Conference on Thermoelectrics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127622058","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: 1

Influence of Band Structure Parameters on the Thermoelectric Properties of Semiconductor Thermoelectric Materials 能带结构参数对半导体热电材料热电性能的影响

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI: 10.1109/ICT.2006.331281

D. Pshenay-Severin, M. Fedorov

引用次数: 6

Automotive Waste Heat Conversion to Electric Power using Skutterudite, TAGS, PbTe and BiTe 利用skutudite, TAGS, PbTe和BiTe将汽车废热转化为电能

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI: 10.1109/ICT.2006.331220

J. LAGrandeur, D. Crane, S. Hung, B. Mazar, A. Eder

引用次数: 138