L. E. Shelimova, T. E. Svechnikova, P. Konstantinov, O. G. Karpinsky, E. S. Avilov, M. Kretova, V. Zemskov
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
{"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 nPbTemiddotmBi<sub>2</sub>Te<sub>3 </sub> and p-type nPbTemiddotmSb<sub>2</sub>Te<sub>3</sub> homologous series compounds is found in the PbTe-Bi<sub>2</sub>Te<sub>3</sub> and PbTe-Sb<sub>2</sub>Te<sub>3</sub> 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 PbBi<sub>4</sub>Te<sub>7</sub> and p-type PbSb<sub>2</sub>Te<sub>4</sub> single crystals grown by Czochralski technique. The considerable anisotropy in thermoelectric properties (especially in PbSb<sub>2</sub>Te<sub>4</sub>) 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 (kappa<sub>33</sub>) is much smaller than that measured in perpendicular to \"c\" axis direction (kappa<sub>11</sub>). 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}
S. Hébert, Y. Klein, A. Maignan, J. Hejtmánek, B. Dabrowski
The thermoelectric properties of ruthenates have been investigated. All the materials studied here are metallic. Thermopower measurements up to high T show that, even if SrRuO3 is metallic up to 800 K, the Seebeck coefficient of SrRuO3 is constant from 160 K to 800 K, close to +33 muV/K. Different substitutions have been investigated, and the thermopower is almost not affected by the different substitutions, remaining constant from ~200-300 K up to 800K, close to +25-+35 muV/K. The same result is obtained in CaRuO3 and derived compounds. Surprisingly, the value of S is close to the theoretical value calculated from spin entropy term only
{"title":"Thermopower of ruthenium metallic oxides: Large influence of the spin degeneracy term","authors":"S. Hébert, Y. Klein, A. Maignan, J. Hejtmánek, B. Dabrowski","doi":"10.1109/ICT.2006.331215","DOIUrl":"https://doi.org/10.1109/ICT.2006.331215","url":null,"abstract":"The thermoelectric properties of ruthenates have been investigated. All the materials studied here are metallic. Thermopower measurements up to high T show that, even if SrRuO3 is metallic up to 800 K, the Seebeck coefficient of SrRuO3 is constant from 160 K to 800 K, close to +33 muV/K. Different substitutions have been investigated, and the thermopower is almost not affected by the different substitutions, remaining constant from ~200-300 K up to 800K, close to +25-+35 muV/K. The same result is obtained in CaRuO3 and derived compounds. Surprisingly, the value of S is close to the theoretical value calculated from spin entropy term only","PeriodicalId":346555,"journal":{"name":"2006 25th International Conference on Thermoelectrics","volume":"59 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":"117012534","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}
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
{"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}
Ca3Co4O9 ceramics powders were synthesized by the citric acid complex (CAC) method and consolidated by the hydrothermal hot-pressing (HHP) technique. The observation by the scanning electron microscope indicated that the powders obtained by the CAC process show plate-like grains. The density and the Lotgering factor, which was estimated from the X-ray diffraction data, of the sintered body increase with an increase of the operating pressure during the HHP process. The electrical resistivity is much reduced with an increase of the operating pressure, but the Seebeck coefficient was hardly affected by the HHP conditions. As a result, the sample treated by the HHP under the condition of 573 K, 200 MPa and 3 h shows a maximum power factor
{"title":"Synthesis of Ca3Co4O9 Ceramics by Citric Acid Complex and Hydrothermal Hot-pressing Processes and its Thermoelectric Properties","authors":"S. Katsuyama, M. Ito","doi":"10.1109/ICT.2006.331353","DOIUrl":"https://doi.org/10.1109/ICT.2006.331353","url":null,"abstract":"Ca3Co4O9 ceramics powders were synthesized by the citric acid complex (CAC) method and consolidated by the hydrothermal hot-pressing (HHP) technique. The observation by the scanning electron microscope indicated that the powders obtained by the CAC process show plate-like grains. The density and the Lotgering factor, which was estimated from the X-ray diffraction data, of the sintered body increase with an increase of the operating pressure during the HHP process. The electrical resistivity is much reduced with an increase of the operating pressure, but the Seebeck coefficient was hardly affected by the HHP conditions. As a result, the sample treated by the HHP under the condition of 573 K, 200 MPa and 3 h shows a maximum power factor","PeriodicalId":346555,"journal":{"name":"2006 25th International Conference on Thermoelectrics","volume":"62 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":"128381044","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}
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
{"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}
Bi0.5Sb1.5Te3 polycrystalline alloy has been processed by Equal Channel Angular Extrusion (ECAE) at 573 K. Sub-micrometric grain size has been obtained, with a consequent decrease of the lattice thermal conductivity and an impressive increase in hardness of the material. A well defined texture is observed, where the basal planes of the hexagonal cell of the crystals arrange themselves parallel to the shear deformation plane (the plane of intersection of the entry and exit extrusion channels). This texture causes anisotropy in the thermoelectric properties; in particular, the transport properties are maximised in the plane at 45deg to the extrusion direction. Warm ECAE applied to an over-doped p-type material, as in the present case, causes an increase of the Seebeck coefficient, as a result of the prevailing concentration of donor-like defects introduced by deformation. The factor of merit Z reaches the value of 2.4 times 10-3 K-1 at 300 K, say 80% higher than the value of the starting material
{"title":"Warm ECAE: a Novel Deformation Process for Optimising Mechanical and Thermoelectric Properties of Chalcogenides","authors":"S. Ceresara, G. Giunchi, G. Ripamonti","doi":"10.1109/ICT.2006.331366","DOIUrl":"https://doi.org/10.1109/ICT.2006.331366","url":null,"abstract":"Bi0.5Sb1.5Te3 polycrystalline alloy has been processed by Equal Channel Angular Extrusion (ECAE) at 573 K. Sub-micrometric grain size has been obtained, with a consequent decrease of the lattice thermal conductivity and an impressive increase in hardness of the material. A well defined texture is observed, where the basal planes of the hexagonal cell of the crystals arrange themselves parallel to the shear deformation plane (the plane of intersection of the entry and exit extrusion channels). This texture causes anisotropy in the thermoelectric properties; in particular, the transport properties are maximised in the plane at 45deg to the extrusion direction. Warm ECAE applied to an over-doped p-type material, as in the present case, causes an increase of the Seebeck coefficient, as a result of the prevailing concentration of donor-like defects introduced by deformation. The factor of merit Z reaches the value of 2.4 times 10-3 K-1 at 300 K, say 80% higher than the value of the starting material","PeriodicalId":346555,"journal":{"name":"2006 25th International Conference on Thermoelectrics","volume":"45 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":"114312494","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}
The maximum cooling temperature of a thermoelectric refrigerator made of uniform bulk material is limited by its dimensionless figure-of-merit ZT. Cascaded stages are typically needed in order to obtain a higher cooling temperature. Multiple stage configurations have disadvantages of device complexity, and reduced efficiency due to the non-ideal heat spreading between different stages. In this paper, we prove that the maximum cooling temperature can be increased by using a single stage made of inhomogeneous material. This optimization is different from conventional graded materials where there is a large temperature gradient and local material properties are optimized in order to achieve the highest ZT at the local temperature under operation. The new optimization is attributed to the redistribution of the Joule heating and Peltier cooling profiles along the current and heat flow directions. The cooling efficiency can also be increased by a moderate amount. Numerical simulations are used to optimize the doping profile for a thermoelectric cooler based on single crystal silicon
{"title":"Cooling Enhancement Using Inhomogeneous Thermoelectric Materials","authors":"Z. Bian, A. Shakouri","doi":"10.1109/ICT.2006.331365","DOIUrl":"https://doi.org/10.1109/ICT.2006.331365","url":null,"abstract":"The maximum cooling temperature of a thermoelectric refrigerator made of uniform bulk material is limited by its dimensionless figure-of-merit ZT. Cascaded stages are typically needed in order to obtain a higher cooling temperature. Multiple stage configurations have disadvantages of device complexity, and reduced efficiency due to the non-ideal heat spreading between different stages. In this paper, we prove that the maximum cooling temperature can be increased by using a single stage made of inhomogeneous material. This optimization is different from conventional graded materials where there is a large temperature gradient and local material properties are optimized in order to achieve the highest ZT at the local temperature under operation. The new optimization is attributed to the redistribution of the Joule heating and Peltier cooling profiles along the current and heat flow directions. The cooling efficiency can also be increased by a moderate amount. Numerical simulations are used to optimize the doping profile for a thermoelectric cooler based on single crystal silicon","PeriodicalId":346555,"journal":{"name":"2006 25th International Conference on Thermoelectrics","volume":"35 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":"114536792","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}
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
{"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}
Many semiconductors have complex structure of conduction or valence band. The thermoelectric parameters of such semiconductors depend on the energy positions of bands and their effective masses. In the present work the thermoelectric parameters of materials with complex band structure have been theoretically investigated. Their dependencies on band structure parameters have been studied in order to find the optimal combination of parameters maximizing the thermoelectric efficiency. The results obtained have been illustrated applying to Mg 2Si-Mg2Sn solid solutions and other materials for which the high thermoelectric figure of merit is connected with the presence of two conduction bands
{"title":"Influence of Band Structure Parameters on the Thermoelectric Properties of Semiconductor Thermoelectric Materials","authors":"D. Pshenay-Severin, M. Fedorov","doi":"10.1109/ICT.2006.331281","DOIUrl":"https://doi.org/10.1109/ICT.2006.331281","url":null,"abstract":"Many semiconductors have complex structure of conduction or valence band. The thermoelectric parameters of such semiconductors depend on the energy positions of bands and their effective masses. In the present work the thermoelectric parameters of materials with complex band structure have been theoretically investigated. Their dependencies on band structure parameters have been studied in order to find the optimal combination of parameters maximizing the thermoelectric efficiency. The results obtained have been illustrated applying to Mg 2Si-Mg2Sn solid solutions and other materials for which the high thermoelectric figure of merit is connected with the presence of two conduction bands","PeriodicalId":346555,"journal":{"name":"2006 25th International Conference on Thermoelectrics","volume":"209 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":"132229206","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}
J. LAGrandeur, D. Crane, S. Hung, B. Mazar, A. Eder
BSST began development of a high efficiency Thermoelectric Waste Energy Recovery System for passenger vehicle applications in November 2004 under a contract [Contract No. DE-FC26-04NT42279] awarded by the U.S. Department of Energy Freedom Car Office. The system reduces fuel consumption by replacing a significant portion of the required electric power normally produced by the alternator with electric power produced from exhaust gas waste heat conversion to electricity in a Thermoelectric Generator Module (TGM). BSST team members include BMW, Visteon and Marlow Industries. In Phase 1, the team created a system architecture, developed a system model to predict performance and established system and subsystem design requirements. The Phase 1 effort resulted in a predicted fuel efficiency increase of 10%. Phase 2 is scheduled to be completed in December, 2006 in which key subsystem components will be built and tested and the system model updated to provide a new performance prediction. This paper presents the current status of the system architecture, modeling and key technologies
{"title":"Automotive Waste Heat Conversion to Electric Power using Skutterudite, TAGS, PbTe and BiTe","authors":"J. LAGrandeur, D. Crane, S. Hung, B. Mazar, A. Eder","doi":"10.1109/ICT.2006.331220","DOIUrl":"https://doi.org/10.1109/ICT.2006.331220","url":null,"abstract":"BSST began development of a high efficiency Thermoelectric Waste Energy Recovery System for passenger vehicle applications in November 2004 under a contract [Contract No. DE-FC26-04NT42279] awarded by the U.S. Department of Energy Freedom Car Office. The system reduces fuel consumption by replacing a significant portion of the required electric power normally produced by the alternator with electric power produced from exhaust gas waste heat conversion to electricity in a Thermoelectric Generator Module (TGM). BSST team members include BMW, Visteon and Marlow Industries. In Phase 1, the team created a system architecture, developed a system model to predict performance and established system and subsystem design requirements. The Phase 1 effort resulted in a predicted fuel efficiency increase of 10%. Phase 2 is scheduled to be completed in December, 2006 in which key subsystem components will be built and tested and the system model updated to provide a new performance prediction. This paper presents the current status of the system architecture, modeling and key technologies","PeriodicalId":346555,"journal":{"name":"2006 25th International Conference on Thermoelectrics","volume":"2 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":"132350548","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：