{"title":"Thermoelectric power in disordered mixed crystals","authors":"P. Lin-Chung, A. Rajagopal","doi":"10.1109/ICT.1996.553299","DOIUrl":"https://doi.org/10.1109/ICT.1996.553299","url":null,"abstract":"In disordered mixed crystals the effect of alloy scattering is known to be of significant importance in comparison with that of lattice scattering in the consideration of electrical and thermal transport properties. In this work we consider the thermoelectric power in such isotropically disordered mixed crystals. We derive the energy current density operator for a combined electron and vibrating ions of the lattice system with the electron-lattice interaction term included. In this preliminary report, the relative importance of electrons and lattice vibrations to the thermoelectric power is discussed. The coherent potential approximation may be used to obtain the thermoelectric power of the disordered mixed crystal as function of the concentration. Our operator formulation is in coordinate space which besides containing previous formulations for metals and alloys as special cases, admits of the coherent-potential approximation methods to be applied as well.","PeriodicalId":447328,"journal":{"name":"Fifteenth International Conference on Thermoelectrics. Proceedings ICT '96","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133726217","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}
A. Burkov, A. Heinrich, C. Gladun, W. Pitschke, J. Schumann
{"title":"Structure and thermoelectric properties of nano-crystalline Rex-Si1-x thin film composites","authors":"A. Burkov, A. Heinrich, C. Gladun, W. Pitschke, J. Schumann","doi":"10.1109/ICT.1996.553532","DOIUrl":"https://doi.org/10.1109/ICT.1996.553532","url":null,"abstract":"In this report results on phase formation and transport properties of amorphous and nano-crystalline Re-Si thin films are presented. The results imply that the partially crystallized Re-Si films, i.e. films consisting of amorphous and nano-crystalline phases form a new class of heterostructures which are essentially different from binary insulator-metal mixtures. We have found that the resistivity and thermopower of the heterogeneous films consisting of amorphous and nano-crystalline phases do not follow the well known effective medium approximation when the ratio between these two phases is varied. Both phase composition and crystalline grain size appear to be important parameters for the thermoelectric material optimization.","PeriodicalId":447328,"journal":{"name":"Fifteenth International Conference on Thermoelectrics. Proceedings ICT '96","volume":"227 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123053591","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}
{"title":"Thermoelectric properties of sintered magnesium compounds","authors":"T. Kajikawa, I. Katsube, S. Sugihara, K. Soejima","doi":"10.1109/ICT.1996.553271","DOIUrl":"https://doi.org/10.1109/ICT.1996.553271","url":null,"abstract":"The thermoelectric properties of the sintered magnesium compounds such as magnesium silicide and magnesium stannide have been researched in order to apply to a thermoelectric power generation system using combustion heat of municipal solid waste. Temperature dependencies of thermoelectric properties such as Seebeck coefficient, electrical resistivity and thermoelectric power factor are measured for the temperature range from 300 K to 770 K. The non-dimensional figure-of-merit for the sintered magnesium silicide is obtained about 0.4 at 600 K in the initial stage. The durability of magnesium compound elements is also discussed.","PeriodicalId":447328,"journal":{"name":"Fifteenth International Conference on Thermoelectrics. Proceedings ICT '96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129305144","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}
{"title":"Electrical properties of porous oxides of alkaline-earth metals with high thermoelectric efficiency","authors":"É. Sher","doi":"10.1109/ICT.1996.553285","DOIUrl":"https://doi.org/10.1109/ICT.1996.553285","url":null,"abstract":"Electrical properties of porous oxide layers investigated with the help of specially developed methods. The electrical conductivity measurements made in the wide range of electrical fields by developed pulse method. The method of thin metallic probes and measurements of their spreading resistance in o.l. used to receive the parameters of electron gas in pores. The value of electrical conductivity of contacts between small oxide grains separated from the value of electrical conductivity through electron gas in pores at high temperatures by measurements of spreading resistance and thermoemf, and their changes in magnetic field. The results of these experiments are giving and discussed below.","PeriodicalId":447328,"journal":{"name":"Fifteenth International Conference on Thermoelectrics. Proceedings ICT '96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116871047","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}
{"title":"Thermoelectric characteristics of homologous compounds with layer structures in the ZnO-In2O3 system","authors":"K. Koumoto, H. Ohta, W. Seo","doi":"10.1109/ICT.1996.553286","DOIUrl":"https://doi.org/10.1109/ICT.1996.553286","url":null,"abstract":"Thermoelectric materials with high Z's have been searched for recently among semiconducting oxide ceramics for the purpose of power generation at high temperatures in an air atmosphere. Metallic oxides consisting of non-transition metal elements which mould possibly have large band widths and high carrier mobility have been the target materials. One possible oxide group is that having In/sub 2/O/sub 3/ as a main component. In the present study, homologous compounds of (ZnO)mIn/sub 2/O/sub 3/ (m=integer) with layer structures were synthesized by reaction-sintering the powder mixtures of ZnO and In/sub 2/O/sub 3/ at 1823 K for 2 h in air. Their thermoelectric characteristics, i.e. electrical conductivity, Seebeck coefficient, and thermal conductivity were measured at 500-1000 K. Their Z depended on the composition and the microstructure.","PeriodicalId":447328,"journal":{"name":"Fifteenth International Conference on Thermoelectrics. Proceedings ICT '96","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126311815","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}
{"title":"Thermoelectric properties and structures of the sintered compact of Cu:Sn:S = 8:1:4 composition","authors":"M. Hasaka, T. Morimura, T. Aki, S. Kondo","doi":"10.1109/ICT.1996.553282","DOIUrl":"https://doi.org/10.1109/ICT.1996.553282","url":null,"abstract":"The compact of Cu:Sn:S=8:1:4 composition was prepared by sintering. The thermoelectric properties of the compact were measured as a function of temperature and annealing period. The microstructures were investigated by X-ray diffraction experiments and transmission electron microscopic observation. The compact is desirable in thermoelectric properties and thermal stability below 450 K. The compact consists of mixtures of several compound structures.","PeriodicalId":447328,"journal":{"name":"Fifteenth International Conference on Thermoelectrics. Proceedings ICT '96","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124288395","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}
{"title":"Thermoelectric generators in photovoltaic hybrid systems","authors":"R. Kugele, W. Roth, W. Schulz, A. Steinhuser","doi":"10.1109/ICT.1996.553505","DOIUrl":"https://doi.org/10.1109/ICT.1996.553505","url":null,"abstract":"The supply of distant electric devices that cannot be connected to the public electricity grid for reasons of cost, waiting time or due to the need of local flexibility has been a major problem. To date, the power supply of such stand-alone systems has been based mainly on battery-buffered fossil-fueled motor-generators. Apart from the consumption of limited fossil fuel reserves, the disadvantages of these systems include the creation of noise and exhaust gases, the constant need to obtain fuel and, most important, the high amount of maintenance and repairs. For these reasons, and due to the progress in regenerative energy conversion made in the last decade, battery-buffered PV power systems are used more and more often. Their advantages are high reliability and low cost of repairs. However, far away from the equator, where solar radiation is very low during the winter, large PV generators are needed to guarantee sufficient reliability. Therefore, system costs are high. Another disadvantage is that the battery lifetime in PV power systems is significantly reduced compared to its lifetime in fossil fueled systems. To avoid these disadvantages, the PV generator can be combined with fossil fueled power generators. In the medium power range, from 10 W up to several hundred W, thermoelectric generators appear to be particularly qualified because of their reliability and lifetime. In this paper, a (so called) \"photovoltaic hybrid system\" is compared to a purely PV power system on the basis of model calculations starting with the solar radiation situation on the Earth's surface.","PeriodicalId":447328,"journal":{"name":"Fifteenth International Conference on Thermoelectrics. Proceedings ICT '96","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121803655","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}
{"title":"Optimum design in thermoelectric cooling systems","authors":"M. Yamanashi, Y. Kibayashi, F. Toyada, M. Azechi","doi":"10.1109/ICT.1996.553303","DOIUrl":"https://doi.org/10.1109/ICT.1996.553303","url":null,"abstract":"An optimum design is investigated to maximize the coefficient of performance (COP) for a thermoelectric cooling system (TEC system) which consists of a thermoelectric cooler (TEC) and heat-exchangers at the cold side and the hot side. Optimizing a TEC in the TEC system for the maximum COP can be performed by using the balance equations of nondimensional entropy flow, when the thermal resistances of heat-exchangers for a TEC system are given and the system operates under a constant temperature difference. In these equations, the COP of the TEC system becomes a function of nondimensional thermal resistance of the cold side heat-exchanger and nondimensional entropy flow at the cold side of the TEC system. Therefore the COP of the TEC system is shown as a contour graph on these two variables. By using this graph, not only TEC design parameters for the maximum COP of the TEC system can be determined, but the degrading effect by thermal resistances of the TEC system on the COP can also be evaluated.","PeriodicalId":447328,"journal":{"name":"Fifteenth International Conference on Thermoelectrics. Proceedings ICT '96","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130373653","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. Sharp, E. H. Volckmann, H. Lyon, D. J. Gillespie, G. Kamm, A. Ehrlich
{"title":"Validation of thermoelectrics measurements. II","authors":"J. Sharp, E. H. Volckmann, H. Lyon, D. J. Gillespie, G. Kamm, A. Ehrlich","doi":"10.1109/ICT.1996.553518","DOIUrl":"https://doi.org/10.1109/ICT.1996.553518","url":null,"abstract":"This paper reports the joint effort of Marlow Industries (MI) and members of the Naval Research Laboratory (NRL) to test the usefulness of a carefully constructed conventional apparatus for measurement of the thermal conductivity of thermoelectrics. The design of the NRL apparatus takes into account the listed error sources, but is especially tailored to eliminate radiative exchange. This choice is driven by the fact that the instrument is most often used to measure the thermal conductivity of metals at high temperatures. We have found that as a consequence of using insulation to prevent radiation, the apparatus is not well suited for measurement of low thermal conductivity samples, such as standard thermoelectrics. The samples used as standard materials were taken from ingots grown at MI by a commercial method. The p-type ingot was grown from a melt of Sb/sub 150/Bi/sub 50/Te/sub 291/Se/sub 9/ plus a few percent of excess Te. The n-type ingot was grown from a doped melt of Bi/sub 20/Te/sub 27/Se/sub 3/. With slight variations, these are the compositions used throughout the thermoelectrics industry.","PeriodicalId":447328,"journal":{"name":"Fifteenth International Conference on Thermoelectrics. Proceedings ICT '96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130499714","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}
{"title":"Miniature thermoelectric generators (TEG) with catalytic heating","authors":"L. Anatychuk, V. Mikhailovskii, V. Konopelnyuk","doi":"10.1109/ICT.1996.553510","DOIUrl":"https://doi.org/10.1109/ICT.1996.553510","url":null,"abstract":"Modern fuel thermoelectric generators (TEG) are widely used in the range of 10-500 W. Chemical sources of current (CSC) that do not always satisfy consumers are used at lower powers. Negative factors are large weight, cost, self-discharge amount, problems in storage and maintenance at low temperatures. CSC manufacture is power-intensive, expensive and ecologically dangerous. That is why fuel TEGs capable of competing with CSCs are of interest. The paper is devoted to fuel TEGs on liquefied gas development for 10-100 mW power ranges. Small power heat sources have been developed on the catalytic counter-flow burner base which stably operates on gas and is suitable for continuous operation on a self-sufficiency basis. The catalytic burner feature at separated fuel and air supply is spontaneous burning resumption after short breaks in fuel supply, changes in air supply and combustion products discharge. The burner's temperature can be maintained within 250-400/spl deg/C. A high efficiency promoted catalyst with service life up to 10000 hours is used in heat sources. The use of results of a series research works in this direction ensured the development of such catalytic heat sources (CHS). TEGs design was made by the computer modelling. TEGs maximum is defined by the following optimizing parameters: a collector aerodynamic drag, burner-collector distance, fuel consumption, load impedance and thermoelectric battery properties.","PeriodicalId":447328,"journal":{"name":"Fifteenth International Conference on Thermoelectrics. Proceedings ICT '96","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133512839","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}