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研究生:封明安
研究生(外文):Ming-An Feng
論文名稱:雜質添加對SrBi4Ti4O15燒結溫度及介電特性之研究
論文名稱(外文):The Study of Impurities-doped on Sintering Temperature and Dielectric Properties of SrBi4Ti4O15
指導教授:鄭建民鄭建民引用關係
指導教授(外文):Chien-Min Cheng
學位類別:碩士
校院名稱:南台科技大學
系所名稱:電子工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:英文
論文頁數:81
中文關鍵詞:鐵電層間化合物燒結溫度介電特性鉍層積混合鐵電性材料非揮發性隨機讀取記憶體
外文關鍵詞:SrBi4Ti4O15Sintering TemperatureDielectric PropertiesThe layer structured bismuth compound ferroelectricNvRAMs
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鐵電性材料為應用於數位記憶體中的資料儲存之極佳材料;除此之外,其他重要的應用如壓電性、熱電性與光電材料可應用在感應器、促動器與微機電系統(MEMS)中。隨機存儲記憶體以半導體層積的科技已獲得成功的發展。為了與電子式可消除讀取記憶體(EEPROM)有所競爭性的發展與區別,鐵電性記憶體(FeRAMs)又稱為非揮發性隨機讀取記憶體(NvRAMs)。
在鐵電性材料中,鐵電層間化合物SrBi4Ti4O15的組成是多年來最受許多研究者歡迎的材料之一。在鉍層積混合鐵電性材料組織中,有一恆等式如後An-1Bi2BnO3n+3;A通常為二價離子,像是Sr2+, Ba2+,或 Pb2+;而B則為Ti4+, Nb5+,或Ta5+。在鉍元素家族中,SrBi4Ti4O15陶瓷被認為是極具吸引性的材料之一,因為其在反覆極化條件下,仍具有極佳之抗疲勞強度,即使在薄膜的條件之下亦可維持其鐵電特性。
在本研究中,我們以SrBi4Ti4O15為主體材料,並藉著不同量的BaO, ZrO2對SrO, TiO2之取代和及過量Bi2O3之添加而形成(Sr,Ba)Bi4Ti4O15, SrBi4(Ti4-xZrx)O15, SrBi4Ti4O15 + xmol Bi2O3三系列組成,再以不同的燒結溫度來觀察、尋找最佳的燒結溫度與介電特性之關係。
Ferroelectric materials are excellent candidates for the applications in the data storage of digital memory systems, in addition to many other important applications such as piezoelectrics, pyroelectrics, and electro-optics in sensors, actuators, and micro electro mechanical systems (MEMS). Random-access memories (RAMs) based on semiconductor integrated technology have been a great success. To be competitive electrically erasable read-only memories (EEPROM), ferroelectric material memories (FeRAMs) are also developed for the nonvolatile random-access memories (NvRAMs) application. Among the ferroelectric materials, SrBi4Ti4O15 is one of the most popular materials attracting many investigators for many years.
The layer structured bismuth compound ferroelectric has the general formula: An-1Bi2BnO3n+3, where A is usually a divalent ion, such as Sr2+, Ba2+, or Pb2+, and B is Ti4+, Nb5+, or Ta5+ [1-3]. Within the bismuth family, SrBi4Ti4O15 ceramics is received as an attracted candidate because of its excellent fatigue endurance against repetitive switching of polarization even when in the form of thin film. In this study, SrBi4Ti4O15 is used as the based composition. (Sr,Ba)Bi4Ti4O15, SrBi4(Ti4-xZrx)O15, SrBi4Ti4O15 + xmol Bi2O3 three compositions are used to find the optimum relationship between sintering temperature and dielectric properties.
Contents
Abstract (in Chinese)………….……………………………………...i
Abstract (in English)…………………………………………….......ii
Acknowledgemen………………..................................iii
Contents…………………………………………………………………………………….iv
List of Tables………………………………………………….…………………………….vi
List of Figures……………………………………………………………………………...vii
Chapter 1 Introduction....…..……………………………………………………………......1
1.1 Fundamental of Ferroelectric……………………………………………………....1
1.2 The Choice of SrBi4Ti4O15........................................................................................2
Chapter 2 Theory and Physical Description…………..……………………………………..4
2.1 Ferroelectric and Piezoelectric Materials…………………………………………..4
2.2 Theory of Polarization……………………………………………………………...5
2.2.1 Ionic Polarization…………………………………………………………….5
2.2.2 Orientational (Dipolar) Polarization…………………………………………9
2.2.3 Interfacial Polarization……………………………………………………...13
2.2.4 Total Polarization…………………………………………………………...16
2.3 Perovskite Lattice and Crystal Structures………………………………………...18
2.3.1 Introduction…………………………………………………………………18
2.3.2 Ferroelectric and Pyroelectric Crystals……………………………………..20
Chapter 3 The Influence of ZrO2 on the Sintering and Dielectric Properties of SrBi4Ti4O15……………………………………………………………..............28
3.1 Experimental Procedures…………………………………………………………27
3.1.1 Sample Preparation…………………………………………………………27
3.1.2 Measurement Method……………………………………………………….27
3.2 Results and Discussion……………………………………………………………28
3.2.1 XRD Analysis…………………………………………………………….....28
3.2.2 SEM (Scanning Electronic Micrograph) Results…………………………...31
3.2.3 Dielectric Constants and Curie Temperatures………………………………35
Chapter 4 Effect of Substitution of BaO in the Sr4Bi4Ti4O15………………………………………………………………………....43
4.1 Experiment Procedures………………………………………………………….43
4.2 Results and Discussion………………………………………………………….44
4.2.1 XRD……………………………………………………………………….44
4.2.2 SEM………………………………………………………………………..47
4.2.3 Dielectric Properties……………………………………………………….51
Chapter 5 The Sintering and Dielectric Properties of Non-Stoichmetry in SrBi4Ti4O15……………………………………………………………………..58
5.1 Experiment Procedures………………………………………………………….58
5.1.1 Sample Preparation………………………………………………………..58
5.1.2 Measurement Method……………………………………………………...58
5.2 Measurement Results……………………………………………………………59
5.2.1 XRD Analysis……………………………………………………………...59
5.2.2 SEM (Scanning Electronic Micrograph)…………………………………..61
5.2.3 Dielectric Properties……………………………………………………….67
Chapter 6 Conclusion………………………………………………………………………75
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