通过不同制备工艺优化PbTe材料的热电性能
发布时间：2023-04-29 02:23
热电材料是一种可以直接实现热、电转化的材料,在能源紧张的今天它具有非常高的研究价值。热电材料的应用分为制冷和发电两个方面,目前制冷已经应用到便携式冰箱和芯片制冷等方面,发电已经应用到汽车尾气系统以及外太空探测电源等方面。就目前的能源现状而言,传统能源仅仅能够维持百余年的能源供应。而我们所利用的传统能源有三分之二都以废热的形式散失掉了,然而热电材料恰恰可以将散失的热能进行重新利用。热电材料百分之十左右的转换效率虽不及太阳能电池以及核能等新能源的转换效率高但是它因在新能源材料领域具有稳定性好,无噪声,无污染,体积小,安全可靠等优势而具有广泛的应用前景。PbTe基热电材料是传统的中温段热电材料,因为具有良好的电性能和较低的热导率而备受青睐。鉴于目前学术界对PbTe的研究较为成熟但是制备方法没有系统研究过,本文主要通过不同的制备工艺对碲化铅以及卤族元素掺杂的碲化铅材料的性能进行优化,以寻找最佳的制备工艺,提高材料的性能,并且为其进一步产业化制备提供科学依据。首先,通过大量的文献调研发现n型PbTe材料的性能远不及p型PbTe热电材料,所以选取了n型材料作为研究对象,由于卤族元素和PbTe材料结...
【文章页数】：95 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Chapter 1 Introduction
1.1 Subject Source
1.2 Background and Significance
1.2.1 Thermoelectric effect
1.2.2 Seebeck coefficients
1.2.3 Electric conductivity
1.2.4 Thermal conductivity
1.2.5 Figure of merit
1.2.6 Conversion efficiency of thermoelectric materials
1.3 Review of literature
1.3.1 Room temperature thermoelectric materials
1.3.2 Middle-temperature range materials
1.3.3 High-temperature materials
1.4 Methods of improving performance for thermoelectric materials
1.4.1 Improving electric conductivity
1.4.2 Raise Seebeck coefficients under certain conditions
1.4.3 Decreasing lattice thermal conductivity
1.5 Applications of thermoelectric materials
1.6 Research significance and arrangement
Chapter 2 Introduction of the experiment
2.1 Preparation of samples
2.1.1 Pure Pb Te
2.1.2 Preparation of Pb I2 doped samples
2.1.3 Preparation of halogens elements doped Pb Te
2.2 Test and characterization
Chapter 3 Investigation of preparation for pure Pb Te
3.1 Electrical properties of different preparation process
3.2 Thermal property of different preparation process
3.3 ZT value of different preparation processes
3.4 Chapter summary
Chapter 4 Effects of cooling speed on Pb Te1-x Ix
4.1 Effects of different cooling speed on hand milled Pb Te1-x Ix
4.1.1 Electric transport properties
4.1.2 Thermal transport performances
4.1.3 Figure of merit
4.1.4 Summary
4.2 Effects of cooling speed for ball mill Pb Te1-x Ix
4.2.1 Electrical transport performances
4.2.2 Thermal transport performances
4.2.3 Figure of merit
4.2.4 Summary
4.3 Effects of cooling speed for ingot PbTe1-xIx
4.3.1 Electrical transport properties
4.3.2 Thermal transport performances
4.3.3 Figure of merit
4.3.4 Summary
4.4 Chapter summary
Chapter 5 Effects of synthesis process on PbTe1-xIx
5.1 Comparisons of ingot, hand mill, ball mill for air cooling Pb Te1-xIx
5.1.1 Electrical transport properties
5.1.2Thermal transport properties
5.1.3 Figure of merit
5.1.4 Summary
5.2 Comparisons of ingot, hand mill, ball mill for water cooling PbTe1-xIx
5.2.1 Electrical transport properties
5.2.2 Thermal transport properties
5.2.3 Figure of merit
5.2.4 Summary
5.3 Comparisons of ingot, hand mill, ball mill for furnace cooling PbTe1-xIx
5.3.1 Electrical transport properties
5.3.2 Thermal transport properties
5.3.3 Figure of merit
5.3.4 Research of hand milled and ingot samples under furnace cooling
5.4 Chapter summary
Chapter 6 Researching for halogen elements doping
6.1 XRD Characterization
6.2 Performance of halogens elements doped Pb Te
6.3 Electrical property
6.4 Thermal property
6.5 Chapter summary
Conclusions
References
Acknowledgments
本文编号：3804970
【文章页数】：95 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Chapter 1 Introduction
1.1 Subject Source
1.2 Background and Significance
1.2.1 Thermoelectric effect
1.2.2 Seebeck coefficients
1.2.3 Electric conductivity
1.2.4 Thermal conductivity
1.2.5 Figure of merit
1.2.6 Conversion efficiency of thermoelectric materials
1.3 Review of literature
1.3.1 Room temperature thermoelectric materials
1.3.2 Middle-temperature range materials
1.3.3 High-temperature materials
1.4 Methods of improving performance for thermoelectric materials
1.4.1 Improving electric conductivity
1.4.2 Raise Seebeck coefficients under certain conditions
1.4.3 Decreasing lattice thermal conductivity
1.5 Applications of thermoelectric materials
1.6 Research significance and arrangement
Chapter 2 Introduction of the experiment
2.1 Preparation of samples
2.1.1 Pure Pb Te
2.1.2 Preparation of Pb I2 doped samples
2.1.3 Preparation of halogens elements doped Pb Te
2.2 Test and characterization
Chapter 3 Investigation of preparation for pure Pb Te
3.1 Electrical properties of different preparation process
3.2 Thermal property of different preparation process
3.3 ZT value of different preparation processes
3.4 Chapter summary
Chapter 4 Effects of cooling speed on Pb Te1-x Ix
4.1 Effects of different cooling speed on hand milled Pb Te1-x Ix
4.1.1 Electric transport properties
4.1.2 Thermal transport performances
4.1.3 Figure of merit
4.1.4 Summary
4.2 Effects of cooling speed for ball mill Pb Te1-x Ix
4.2.1 Electrical transport performances
4.2.2 Thermal transport performances
4.2.3 Figure of merit
4.2.4 Summary
4.3 Effects of cooling speed for ingot PbTe1-xIx
4.3.2 Thermal transport performances
4.3.3 Figure of merit
4.3.4 Summary
4.4 Chapter summary
Chapter 5 Effects of synthesis process on PbTe1-xIx
5.1.2Thermal transport properties
5.1.3 Figure of merit
5.1.4 Summary
5.2 Comparisons of ingot, hand mill, ball mill for water cooling PbTe1-xIx
5.2.2 Thermal transport properties
5.2.3 Figure of merit
5.2.4 Summary
5.3 Comparisons of ingot, hand mill, ball mill for furnace cooling PbTe1-xIx
5.3.2 Thermal transport properties
5.3.3 Figure of merit
5.3.4 Research of hand milled and ingot samples under furnace cooling
5.4 Chapter summary
Chapter 6 Researching for halogen elements doping
6.1 XRD Characterization
6.2 Performance of halogens elements doped Pb Te
6.3 Electrical property
6.4 Thermal property
6.5 Chapter summary
Conclusions
References
Acknowledgments
本文编号：3804970
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