本論文是研究 Y5V-1206 電容器微結構分析。以 X-ray 繞射分析結晶相。微結構分析則採用光學式顯微鏡(OM)、掃描式電子顯微鏡(SEM)與穿透式電子顯微鏡(TEM)。
雙晶(twinning)是由於分解剪應力，使其結構產生鏡像的結構。在鈦酸鋇(BaTiO3)結構中， 雙晶是發生在 (111) 平面上，使其有晶相關係在兩個晶粒上，並且我們可用數學算式矩陣(matrix)去定義。
我們給予一各高電壓、低電流去迫害電容器。然後，我們去分析電容器遭到破壞(breakdown)的結構，並且分析電容器壞掉的機制。
我們懷疑其電力場分布與 Core-Shell 結構在居禮溫度(Curie Temperature)的關係，並藉由 Core-Shell 結構來比較 X7R 電容器與 Y5V 電容器，並且懷疑是添加劑 Zr-doped 來造成介電常數的不同。

The microstructure of Y5V-1206 capacitor has been studied using X-ray diffractometry (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM).
Twinning occurs when a crystal undergoes a shear stress which produces a crystal structure which is a mirror image of itself. In BaTiO3, twinning occurs in (111) plane and the orientation relationships of it between two grains have been analyzed. We can define it for transformation matrices.
We supply high-voltage, low-current pulses to capacitor for breakdown of it. We confer on reason for breakdown.
We suspect the discrepancy is due to the change in the field distribution above and below Curie Temperature in core-shell structure. It differentiates dielectric constant (

Contents

Page
Abstract.........................................................................................................................2

Content..........................................................................................................................3

List of Figures...............................................................................................................5

List of Tables.................................................................................................................9

Chapter 1 Introduction

Chapter 2 Literature Review

2-1 The structure of perovskites...................................................................................11
2-2 Crystal structure of BaTiO3....................................................................................11
2-3 Equilibrium phase diagram of the BaO-TiO2 system............................................16
2-4 Twins......................................................................................................................16
2-5 Transformation matrix...........................................................................................22
2-6 Multilayer Ceramic Capacitors..............................................................................25

Chapter 3 Experimental Procedures

Chapter 4 Results

4-1 XRD results............................................................................................................31
4-2 Observation of microstructure
4-2-1 OM observation..................................................................................................35
4-2-2 SEM observation................................................................................................35
4-2-3 TEM observation................................................................................................46

Chapter 5 Discussion

5-1 Twinning for BaTiO3..............................................................................................58
5-2 The dielectric constant of microstructures for BaTiO3..........................................61
5-3 Fissures..................................................................................................................62
5-4 Twinning for super spots........................................................................................62
5-5 Interface for BaTiO3 and Ni...................................................................................62

Chapter 6 Conclusions
.
Chapter 7 Suggestions to future work

Appendices

A-1 JCPDs cards for compounds related to this study.................................................65
A-2 Kikuchi SAPDs for Tetragonal BaTiO3................................................................68
A-3 The stereographic projection for Tetragonal-BaTiO3............................................69
A-4 Analysis zones of Tetragonal-BaTiO3...................................................................70

References

Chiang, Y. M., Birnie III, D. P.,and Kingery, W. D., “Physical Ceramics, “ pp38-41.
John Wiley (1976)

Eibl, O., Pongratz, P.,and Skalicky, P., “Crystallography of (111) twins in BaTiO3,” Philos. Mag. B, 57 [4] 521-534 (1989)

Eibl, O., Pongratz, P.,and Skalicky, P., “Formation of (111) Twins in BaTiO3 Ceramics,” J.Am.Ceram. Soc., 70 [8] C195-C197 (1987)

Javadpour, J. and Eror, N. G., “Raman spectroscopy of higher Titanate phase in BaTiO3-TiO2 system,” J. Am. Ceram. Soc., 71 [4] 206-203 (1988)

Krasevec, V., Drofenik, M.,and Kolar, D., “Genesis of the (111) twin in Barium Titanate,” J. Am. Ceram. Soc., 73 [4] 856-860 (1990)

Lee, B. K., Chung, S. Y.,and Kang, S. J. L., “Necessary Conditions for the formation of {111} twins in Barium Titanate,” J.Am.Cream.Soc., 83 [11] 2858-2860 (2000)

Chiang, Y. M., Birnie, D. P.,and Kingery, W. D., “Physical Ceramics”, John Wiley & Sons, Inc., New York, USA (1997)

Kingery, W. D., “Introduction to Ceramics”, John Wiley and Sons., 2nd edition (1976)

Yoon, S. H., Lee, J. H., Kim, D.Y.,and Hwang, N. M., ”Core-shell Structure of Acceptor-Rich, Coarse Barium Titanate Grains,” J. Am.Ceram. Soc., 85[12], pp3111-3113 (2002)

Kishi, H., Mizuno, Y., and Chazono, H., “Base-Metal Electrode-Multilayer Ceramic Capacitors: Past, Present and Future Perspectives” Jpn. J. Appl. Phys., 42[1], pp1-15 (2003)

Lu, H. Y., Bow. J. S., and Deng, W. H., “Core-Shell Structure in ZrO2-Modified BaTiO3 Ceramic,” J. Am. Ceram. Soc., 73[12] 3562-68 (1990)

Waser, R., Baiatu, T., and Hardtl, K. H., “dc Electrical Degradation of Perovskite-Type Titanates: I, Ceramics” J. Am. Cream. Soc., 73[6] 1645-53 (1990)

McCauley, D. E., Chu, M. S., and Megherhi, M. H., “Reliability Evaluation of BME X7R Dielectrics Using Standard and Highly Accelerated Life Test Methods” Ferro Electronic Material Systems (2004)

Peng, C. J., and Lu, H. Y., “Compensation Effect in Semiconducting Barium Titanate,” J. Am. Ceram. Soc., 71, C-44-C-46 (1988)