声明
摘要
Abstract
CONTENTS
General Introduetion
1.1 The Spinel Structure
1.1.1 Tetrahedral Sites
1.1.2 Octahedral Sites
1.2 Spinel Ferrites
1.2.1 Types of Ferrites
1.3 Chromites spinel
1.4 Thesis Out lines
References
Chapter-2 High pressure and Experimental techniques
2.1 High pressure
2.2 The Diamond Anvil Cell
2.3 Synchrotron X-ray Radiation
2.3.1 Synchrotron X-ray diffraction
2.4 Raman Spectroscopy
2.5 Electrical resistivity
2.6 Pressure calibration
References
Chapter 3:Pressure-induced Structural Evaluation and Insulator-Metal Transition in Mixed Spinel Ferrite Zn0.2Mg0.8Fe2O4
3.1 Introduction
3.2 Experimental detail
3.2.2 Experimental Techniques
3.3 Results
3.3.1 Pressure-induced structural changes from X-ray diffraction
3.3.2 Pressure-dependent Raman spectroscopy
3.3.3 Pressure-dependent electrical resistivity
3.4 Discussion
3.5 Conclusion
References
Chapter 4:Pressure-induced Structural and Semiconductor-semiconductor transitions in Mg Doped CoCr2O4
4.1 Introduction
4.2 Experimental and calculation details
4.2.3 First-principles calcutations
4.3 RESULTS
4.3.1 Pressure-induced structural transformation
4.3.2 The theoretical calculation on Co0.5Mg0.5Cr2O4 under pressure
4.3.3 Pressure-dependent Raman spectroscopy
4.3.4 Pressure-dependent electrical resistivity
4.4 Discussion
4.5 Conclusion
Referenees
Chapter 5:General Conclusions and Future Perspectives
References
Publications
Acknowledgements