本文研究了摻雜元素和燒結氣氛等工藝條件對ZnO陶瓷熱電性能的影響。ZnO是一類具有寬帶隙（室溫3.37 eV）、大激活能（60 meV）、高Seebeck系數(shù)和高電導率和高熔點（1975℃）的半導體材料。相對于其它氧化物熱電材料,ZnO具有較高的功率因子,有可能成為優(yōu)異的高溫區(qū)熱電材料。但是較高的晶格熱導率不利于ZnO熱電性能的進一步提高。本畢業(yè)論文旨在保持ZnO的功率因子其不變的情況下,通過進一步降低ZnO的晶格熱導率,以期達到提高ZnO熱電性能的目標。本文首先確定了傳統(tǒng)的固相反應法合成ZnO陶瓷樣品的最佳條件。研究了不同球磨時間對熱電性能的影響,發(fā)現(xiàn)實現(xiàn)最佳熱電性能的球磨時間一般是15小時。通過球磨可以影響材料的各項性能,因此球磨技術是合成純凈和摻雜的ZnO關鍵工藝流程之一。實驗中發(fā)現(xiàn)使用濕法研磨,行星球磨機單向旋轉,轉速為2O5rpm時,能夠得到均勻的混合物。燒結氛圍是影響材料熱電性質(zhì)的另一個重要因素。ZnO在存在氧空位時很不穩(wěn)定,所以找到一個合適的燒結氛圍非常重要。同樣組分的樣品放在不同的氛圍下燒結得到的Seebeck系數(shù)也不同。研究發(fā)現(xiàn)在氬氣環(huán)境下燒結樣品的Seebeck系數(shù)... 

【文章來源】：山東大學山東省211工程院校985工程院校教育部直屬院校

【文章頁數(shù)】：208 頁

【學位級別】：博士

【文章目錄】：
List of abbreviations
Abstract
Abstract in Chinese中文摘要
Chapter 1 Introduction to thermoelectric materials
    1.1 Background of energy sources
    1.2 History and applications of thermoelectricity
    1.3 Thermoelectric effects
    1.4 Conflicting thermoelectric properties
    1.5 Unstable Thermoelectric properties of doped ZnO under Oxygen vacancies
    1.6 Background of ZnO based thermoelectric materials
    1.7 Thesis outline
Chapter 2 Materials fabrication and characterization techniques
    2.1 Materials fabrication
    2.2 Sintering tachniques
    2.3 Measurements of thermoelectric properties
    2.4 Samples characterization techniques
Chapter 3 Thermoelectric properties of indium-doped zinc oxide sintered at high temperature in anargon atmosphere
    3.1 Introduction
    3.2 Structural properties
    3.3 Measurement of thermoelectric properties
    3.4 Conclusions
Chapter 4 Atmospheric dependent thermoelectric properties of Al-doped zinc -oxide
    4.1 Introduction
    4.2 Characterization of Al-doped ZnO
    4.3 Thermoelectric properties of Al-doped ZnO
    4.4 Conclusions
Chapter 5 Effects of Al~(3+) and In~(3+) dual-doping on thermoelectric properties of zinc oxide sintered inan argon atmosphere
    5.1 Introduction
    5.2 Phase and microsctructure analysis of the co-doped ZnO
    5.3 High temperature thermoelectric properties of Al, In co-doped ZnO
    5.4 Conclusions
Chapter 6 Sintering atmospheres and thermoelectric properties of Al, Ga co-doped zinc oxide
    6.1 Introduction
    6.2 Phase and morphology analysis
    6.3 Thermoelectric properties measurements
    6.4 Conclusions
Chapter 7 Tunable electrical resistivities of Al~(3+), B~(3+) dual doped zinc oxide sintered at hightemperature in an argon atmosphere
    7.1 Introduction
    7.2 Phase identification and characterization
    7.3 Measurements of thermoelectric properties
    7.4 Conclusions
Chapter 8 Conclusions
References
acknowledgements
Publications during Ph.D.
附件



本文編號：3628965