臺灣博碩士論文加值系統

現今高科技產業蓬勃時代，光電效應材料已經廣泛應用於日常生活中。目前產業中所使用的光電效應材料，其大部分都具有高濃度的鉛含量。為安全起見及環境考量，進一步研究並開發無鉛光電陶瓷是必要的。鈦酸鍶(SrTiO3)因其具備化學穩定性高、熱穩定性高、光催化活性佳等優異特性，故其可候選為替換材料之一。
本研究主要利用雙氧水(H2O2)的氫氧基(OH-)和醋酸(CH3COOH)的氫氧基與羥基(COO-)等官能基於鈦酸鍶粉體之表面形貌進行改質行為。於無壓環境及不同燒結溫度(1350 ºC、1400 ºC、1450 ºC)下，觀察燒結行為對經表面改質之鈦酸鍶粉體所產生的影響。在此實驗中，分別研究了三種鈦酸鍶燒結樣品，包含純鈦酸鍶、經雙氧水處理之鈦酸鍶以及經醋酸處理之鈦酸鍶，並且觀察與比較燒結粉體和其表面改質的差別。
鈦酸鍶粉體的表面改質不僅是一低成本、高效益的製備方法，其亦可製成具有高密度的光電性能多晶陶瓷材料。進一步研究後發現，經醋酸處理之鈦酸鍶粉體具有最高的相對密度值(99.9%)。而於相同燒結溫度與時間下，未處理之純鈦酸鍶粉體與經雙氧水處理之鈦酸鍶粉體的相對密度值依序為93.1%和81.3%。

Nowadays, almost all electro-optical ceramics contain high concentration of lead. Therefore, for the safety of the environment, lead-free electro optical ceramics must be developed. As a replacement, strontium titanate (SrTiO3) may be an excellent candidate material. In this study, the OH group of both hydrogen peroxide (H2O2) and acetic acid (CH3COOH) as well as the carboxyl group (COO-) of the acetic acid were used to react with the surface of SrTiO3 in order to provide the bonding reaction. Afterwards, SrTiO3 was sintered at different temperatures (1350 ºC to 1450 ºC) by using pressureless sintering technique to complete the bonding and crystallize the structure. Additionally, we studied the differences among the three sintered SrTiO3 samples, un-treated, acetic acid treated and hydrogen peroxide treated SrTiO3. The difference among these sintered powders and their surface modifications were observed and compared.
The surface modification of SrTiO3 powder can provide an inexpensive way to obtain high density polycrystalline ceramics with better electro-optical properties. Acetic acid treated SrTiO3 sintered at 1400 ºC has shown the highest density (99.9%) compared to un-treated SrTiO3 (93.1%) and hydrogen peroxide treated SrTiO3 (81.3%).

中文摘要 I
Abstract II
Contents III
List of Tables V
List of Figures VI
Chapter 1 Introduction 1
Chapter 2 Literature Review 3
2.1 Electro-optical ceramics 3
2.2 Basic properties of Strontium Titanate (SrTiO3) 10
2.2.1 Crystal Structure of SrTiO3 11
2.2.2 Optical property of SrTiO3 13
2.3 Sintering techniques 16
2.3.1 Hot isostatic pressing 16
2.3.2 Vacuum sintering 18
2.3.3 Spark plasma sintering 18
2.3.4 Pressureless sintering 20
2.4 Motivation 21
Chapter 3 Experimental Procedure 22
3.1 Experimental Materials and Instrumentations 22
3.2 Experimental design 24
3.2.1 SrTiO3 Preparation 24
3.2.2 SrTiO3 Powder Samples Soaking 26
3.2.3 SrTiO3 Bulk Preparation 27
3.3 Materials Characterization 28
3.3.1 X-Ray Diffractometer (XRD) 29
3.3.2 Field Emission Scanning Electron Microscope (FE-SEM) 31
3.3.3 Fourier Transform Infrared Spectroscopy (FTIR) 33
3.3.4 Inductively Coupled Plasma-Mass Spectrometer (ICP-MS) 33
3.3.5 Transmission Electron Microscope (TEM) 34
3.3.6 Archimedes method 35
Chapter 4 Results 37
4.1 SrTiO3 Powder Analysis Results 37
4.2 SrTiO3 Bulk Analysis Results 46
Chapter 5 Discussion 58
5.1 Discussion About SrTiO3 Powders Analysis Results 58
5.2 Discussion About SrTiO3 Bulks Analysis Results 61
Chapter 6 Conclusions 64
Chapter 7 Future Work 66
References 67

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