Phase Relations of the Bismuth - Lead Telluride - Lead and Lead Telluride - Bismuth Telluride Systems PDF Download
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Author: James Arthur Donovan
Publisher:
ISBN:
Category : Phase rule and equilibrium
Languages : en
Pages : 148
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Author: James Arthur Donovan
Publisher:
ISBN:
Category : Phase rule and equilibrium
Languages : en
Pages : 148
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Author: Edmund A. Cortellini
Publisher:
ISBN:
Category : Lead compounds
Languages : en
Pages : 272
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Author: Gary W. Henger
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 100
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Author:
Publisher:
ISBN:
Category : Bismuth compounds
Languages : en
Pages : 56
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Book Description
A total of 699 references are included to journal articles and reports dealing with properties of bismuth, lead, and tin tellurides. The references are arranged by sujbect. Author and report-number indexes are included.
Author: Christopher M. Jaworski
Publisher:
ISBN:
Category : Bismuth alloys
Languages : en
Pages :
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Abstract: With the global interest in cutting back dependence on non-renewable energy sources, the field of thermoelectricity has recently seen renewed interest. Additionally, several exciting breakthroughs in both nanoscale and bulk materials have led to increased figure of merit zT. Figure of merit is a indirect measurement of a material's thermoelectric efficiency; its ability to convert a thermal heat flux to electrical power, and vice versa. Material zT has been limited to approximately 1 since the 1950's; in the past decade there have been several reports of zT>1.4. The major drawback for the development of thermoelectric devices is historically low material efficiency. However, it has been predicted that only a zT=2 is necessary to reach widespread usage of thermoelectric materials. A high zT material requires high thermopower, low electrical resistivity, and low thermal conductivity. These three material parameters are all interrelated. Therefore, recent research has focused on decoupling these parameters from each other. In this thesis, the underlying theory that is necessary for characterizing thermoelectric materials is outlined. We investigate the zT increase in the material system PbTe-PbS that was achieved through nanoprecipitation of PbS rich regions in a bulk PbTe matrix. After performing a full galvanomagnetic and thermomagnetic characterization where electrical resistivity, Seebeck, Hall, and Nernst-Ettingshausen coefficients are measured we calculate Fermi level, carrier effective mass, and scattering parameter. The introduction of the second phase of PbS in PbTe does not lower the product S2[sigma] but is reported to reduce thermal conductivity. It is this decrease in thermal conductivity that leads to a gain in zT. The second system studied is Bi2Te3:Sn. It has been reported by Kulbachinskii that Sn possibly forms a resonant level in Bi2Te3, and in this thesis, we investigate this claim further. In order to do so, we calculate a Seebeck coefficient vs. carrier density (Pisarenko relation) for Bi2Te3 and confirm it with experimental and literature data. This relation is necessary to determine if one has modified the density of states of Bi2Te3 and increased thermopower over that of a similarly doped Bi2Te3 that has a normal energy dispersion relation. In addition to the galvanomagnetic and thermomagnetic measurements, Shubnikov-de Haas (SdH) measurements are performed at 1.9K. There is conflicting literature on possible interpretations of the SdH measurements, we follow both interpretations and report the results. In summary, we conclude that by doping Bi2Te3 to higher carrier densities, we could begin to dope the lower valence band thus leading to an increase in zT.
Author: Dana Ben-Ayoun
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 0
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The demand for energy efficiency has motivated many researchers to seek for novel methods capable of enhancing the conversion of heat to electricity. Most of the recently published methods for thermoelectric (TE) efficiency enhancement discuss on the reduction of the lattice thermal conductivity, with a minor focus on improved electronic optimization. This is attributed mainly to the fact that the electronic properties are correlated and opposing each other upon increasing the carrier concentration. It has been reported that the system of PbTe-BiTe has potentially high TE performance; this chapter is focused on a detailed investigation of the co-effect of bismuth as an effective electronic dopant and at the same time, as a second phase promoter in the PbTe matrix. (PbTe)x(BiTe)1,àíx alloys were thermoelectrically examined and the values were analyzed analytically by the general effective media (GEM) approach.
Author: General Instrument Corporation. Thermoelectric Division
Publisher:
ISBN:
Category : Bismuth compounds
Languages : en
Pages : 152
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1572
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 658
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Author: American Society for Metals
Publisher:
ISBN:
Category : Metal-work
Languages : en
Pages : 484
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