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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 韋文誠 | |
| dc.contributor.author | Tzu-Chi Kuo | en |
| dc.contributor.author | 郭子期 | zh_TW |
| dc.date.accessioned | 2021-06-13T06:38:26Z | - |
| dc.date.available | 2012-07-28 | |
| dc.date.copyright | 2011-07-28 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-07-25 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/34996 | - |
| dc.description.abstract | 本研究添加少量(＜10 mol%)二氧化錫至氧化鉍中，以膠粒製程與固態反應法合成並進行性質分析。研究目的包括了解添加二氧化錫對於氧化鉍的導電性質、抗還原性質的影響，並釐清既有氧化鉍－二氧化錫相圖彼此間的相異之處。X光繞射儀與熱差分析儀被用於研究添加二氧化錫之氧化鉍(BSO)樣品的相變行為，此外進行了密度量測、掃描式電子顯微鏡觀察、兩點電極電性量測以及重量損失實驗，以測試BSO樣品的性質。由分析結果重新繪製了新的氧化鉍－二氧化錫相圖。BSO樣品基本上為α相氧化鉍與錫酸鉍(Bi2Sn2O7)的雙相混合樣品，唯有添加1 mol%二氧化錫(1BSO)的樣品在燒結後形成介穩定的α-氧化鉍單一相。而1BSO也是導電性表現最好的BSO樣品，其於600oC的導電性為7.74×10-5 S/cm，而在650oC的導電性為1.78×10-4 S/cm。此外，在650oC、氧分壓為10-16 atm的還原氣氛下，1BSO樣品在80分鐘內仍保持氧化態不被還原。 | zh_TW |
| dc.description.abstract | Various Bi2O3 materials (BSO) doped with SnO2 up to 10 mol% have been synthesized by colloidal process and solid state reactions. The objectives are to study the effect of SnO2 dopant on the electrical conductivity and the stability of the BSO materials in reducing atmosphere. The discrepancies existing between the reported Bi2O3-SnO2 phase diagrams are also investigated. X-ray diffraction (XRD) and differential thermal analyzer (DTA) are used to investigate the phase transition behaviors of the BSO samples. Archimedes’ method, XRD, scanning electron microscope (SEM) observation, 2-probe conductivity measurement and mass loss test are used to study the properties of the samples. A revised Bi2O3-SnO2 phase diagram of 0~10 mol% SnO2 region is proposed. Most of sintered BSO samples consist of α-Bi2O3 and Bi2Sn2O7 phases. While the sintered 1 mol% SnO2-doped Bi2O3 (1BSO) is dense and shows single phase α-Bi2O3. The highest electrical conductivity at the range of 450~700oC were obtained by 1BSO sample, which was 7.74×10-5 S/cm at 600oC and 1.78×10-4 S/cm at 650oC. The most noteworthy advantage of SnO2-dopant is that it stabilizes the Bi2O3 matrix in reducing atmosphere in which the oxygen partial pressure is 10-16 atm (controlled by CO/CO2) at 650oC. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T06:38:26Z (GMT). No. of bitstreams: 1 ntu-100-R98527006-1.pdf: 9832591 bytes, checksum: 34e4d10f6998c66f08ee50bc073cdd2c (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 摘要 I
Abstract II List of Figures V List of Tables VIII Chapter 1 Introduction 1 Chapter 2 Literature Review 5 2.1 Bi2O3-based Materials as Electrolyte for SOFC 5 2.1.1 Criteria of Electrolyte for SOFC 5 2.1.2 Characterization of Bi2O3 6 2.1.3 Doped-Bi2O3 Materials for Development of SOFC Electrolyte 8 2.2 Tetravalent Cation-doped Bi2O3 Materials 15 2.2.1 ZrO2-doped Bi2O3 15 2.2.2 SnO2-doped Bi2O3 16 2.2.3 Other MO2-doped Bi2O3 materials 18 Chapter 3 Experimental Procedure 25 3.1 Materials 25 3.2 Processing of SnO2-doped Bi2O3 (BSO) Samples 25 3.2.1 SnO2 Slurry for Tests of Colloidal Properties 25 3.2.2 Colloidal Processing for BSO Sample 26 3.2.3 Calcination, Sintering and Quenching 26 3.2.4 Preparation of Bi2O3-Bi2Sn2O7 Mixed Standard 27 3.3 Characterization 27 3.3.1 Colloidal Property Test for SnO2 27 3.3.2 Differential Thermal Analysis (DTA) 28 3.3.3 X-ray Diffraction (XRD) analysis 29 3.3.4 Density Measurement 31 3.3.5 Microstructure Observation 31 3.3.6 Electrical Conductivity Measurement 32 3.3.7 Mass Loss Test 32 3.3.8 Oxygen Pressure in Reducing Atmosphere 33 Chapter 4 Results and Discussion 38 4.1 Colloidal Properties of SnO2 38 4.1.1 Dispersant for SnO2 38 4.1.2 Adequate Dispersion Period for SnO2 39 4.2 Bi2O3-SnO2 Phase Diagram 46 4.2.1 Phase Transition Temperatures of SnO2-doped Bi2O3 46 4.2.2 Phase Transformation of Bi2O3-SnO2 Composition 47 4.2.3 Revised Bi2O3-SnO2 Phase Diagram 48 4.3 Properties of Sintered BSO Samples 57 4.3.1 Sintered Density 57 4.3.2 Microstructure 57 4.3.3 Quantification of Phases in BSO sample 58 4.3.4 Electrical Conductivity 59 4.4 Effect of Atmosphere on BSO Sample 71 4.4.1 Mass Loss Behavior in Air 71 4.4.2 Mass Loss Behavior in Reducing Atmosphere 72 4.4.3 Electrical Conductivity in Reducing Atmosphere 74 Chapter 5 Conclusions 89 References 94 | |
| dc.language.iso | en | |
| dc.subject | 還原 | zh_TW |
| dc.subject | 氧化鉍 | zh_TW |
| dc.subject | 二氧化錫 | zh_TW |
| dc.subject | 相圖 | zh_TW |
| dc.subject | 導電性 | zh_TW |
| dc.subject | conductivity | en |
| dc.subject | Bi2O3 | en |
| dc.subject | SnO2 | en |
| dc.subject | reduction | en |
| dc.subject | phase diagram | en |
| dc.title | 1~10莫耳百分比氧化錫添加之氧化鉍作為固態電解質之研究 | zh_TW |
| dc.title | Investigation of 1~10 mol% SnO2-doped Bi2O3 as Solid Electrolyte | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 呂福興,徐永富 | |
| dc.subject.keyword | 氧化鉍,二氧化錫,相圖,導電性,還原, | zh_TW |
| dc.subject.keyword | Bi2O3,SnO2,phase diagram,conductivity,reduction, | en |
| dc.relation.page | 102 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2011-07-25 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
| 顯示於系所單位： | 材料科學與工程學系 | |
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