Caracterización de Skutterudites como material termoeléctrico desarrollado con nanotecnología.
In this research work it has been implemented with the semiconductor characterization, base basically in the thermoelectric structure develop with Skutterudite nanostructures, under different manufacturing process, specially compounds from the type Co-Ni-Sb, by developing and study of its intrinsic...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2006 |
| País: | España |
| Institución: | CBUC, CESCA |
| Repositorio: | TDR. Tesis Doctorales en Red |
| OAI Identifier: | oai:www.tdx.cat:10803/6343 |
| Acceso en línea: | http://www.tdx.cat/TDX-1212106-125204 http://hdl.handle.net/10803/6343 https://dx.doi.org/10.5821/dissertation-2117-93655 |
| Access Level: | acceso abierto |
| Palabra clave: | semiconductor coefficient of performance seebeck peltier termoelectricidad 53 620 621.3 |
| Sumario: | In this research work it has been implemented with the semiconductor characterization, base basically in the thermoelectric structure develop with Skutterudite nanostructures, under different manufacturing process, specially compounds from the type Co-Ni-Sb, by developing and study of its intrinsic characteristics related to thermoelectric properties as the figure of merit, by the use of special design tooling for such purpose, doing analogies of their behavior with classic materials. It is also shown the specific instrumentation. In chapter 1 it is shown the general actual stage of the semiconductor materials use in Thermoelectric and related measurement systems.<br/><br/>The chapter 2 has been focus for the introduction of different model series of monomodule and the basic structure of the thermoelectric system with the mainly objective to know the behavior of the pellets and different simulation versions. The continues model base its development in the use of the average parameters taken from different concepts as temperature functions and the semiconductor material. With the utilization of models base in finite elements the software was simplify as a support, as it is much more easier to include parameters in each of the elements that the material is divide.<br/><br/>In chapter 3 it has been develop the study of some thermoelectric compounds base in BiTe. It has been develop the characterization of a compound base in (Bi2Te3)1-xy( Sb2Te3)x(Sb2Se3)y that pretends exploit the BiTe characteristics at room temperatures about 300K. Previously it has been develop some theoretical concepts that will explain the different techniques in the development of the thermoelectric materials as the design in 2D quantum well that has multiple advantages regarding the Figure of Merit goals higher than with bulk materials. To finish in chapter 3, it was study a mono-module base in the study materials.<br/><br/>In chapter 4 the material Skutterudite has been develop as an experimental base that conform part of this thesis. The Skutterudite system possess basic conditions to obtain a high Figure of Merit Z. The Skutterudite are forming covalent structures with low coordination index between atoms in the big vacuum interact that exist. New compounds can be form from new atoms added in vacuum interact, which implements in the optimization of the thermoelectric characteristics. It has been study Skutterudite solutions base in compounds from type CoSb3-xAsx for temperature ranges up to 700K.<br/><br/>In the chapter 5 it was develop few experiments related to the Skutterudite material, prepare with nanotechnology. Is the core of this thesis and has been divide in tree basic experiments. Study of the material Co-Sb with nano-structure. Study of the material Co-Sb were the Co is replace by Ni to study its thermoelectric characteristics and the study of the mono-module constructed with the study materials. It was also study a thermoelectric mono-module according to the thermoelectric study materials. As a main target we have use the type of material CoSb3 (M1), which acts as n material and Zn4Sb3 that works as p material.<br/><br/>The obtained results could be the base for the study of the materials also base in CoSb3, but replacing its structure for new elements. The Nb (Niobio), is an element that was study and works as a dope agent type p replacing the Co atoms. The electrical conductivity could be increase in the final compound but some research lines will confirm its well use. Another research task that could lid from this thesis study is the use of thermoelectric structures (thermoelectric devices) base in the material being study.<br/>The microprobe tool, has been develop in special way to use as a research tool for the thesis expose. Is a very useful tool that has been use to measure the Seebeck coefficient in the materials, and the electrical conductivity. The microprobe is basically form by heated test point that is positioned over a sample device. The end of the pointer is connected to a thermocouple normally type T, Cu-CuNi ; that measures the temperature call T1. The sample is always place over a good electrical and thermal contact, which is also connected to a thermocouple to measure the temperature T0. By the combination the wires Cu-Cu and CuNi-CuNi, from the thermocouples it is possible to obtain the voltage that will be name U0 and U1 that are well process to obtain the Seebeck coefficient. |
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