本书利用了从头计算的晶体结构的确定方法，结合同步辐射X射线衍射数据和固体核磁共振对高温高压条件下所得的硅酸锌晶体的原位结构信息进行了解析。利用日本冈山大学地球内部物质科学中心的5000吨Kawai型两级非轴性分裂球对面顶砧的装置合成了硅酸锌的一系列高压同质多象体——Phase II，III 和IV是分别在6 GPa 和1473 K，6.5 GPa 和1273 K 以及8 GPa和1273 K的温压条件下合成的。此次的研究解析了phase III 和IV 在常压下的晶体结构。其次，利用29Si固体核磁共振、拉曼光谱以及电子探针对四个硅酸锌的同质多象进行了表征。

刘衔宇 Liu Xianyu
Ph.D. in Mineralogy.
Associate professor and postgraduate supervisorin Gemology.
Graduated from China University of Geosciences(Wuhan) in 2013.
Supported by the National Scholarship Fund ofChina and the Ministry of Education, Culture,Sports, Science and Technology (MEXT) ofJapan for two years during Ph.D. study. Presidedover and participated in a number of national,provincial and municipal scientific researchprojects (presided over 5 scientific researchand cultural and creative projects in Shanghai);engaged in teaching and research related tojewelry identification and evaluation, publishedmore than 20 papers related to gemmologyand mineralogy, including some SCI articles,5 international conference papers.

Chapter 1 Introduction
1.1 High-Pressure and High-Temperature (HPHT) Experimental Methods for Earth Science
1.2 MAA and HPHT Experimental Method
1.2.1 MAA
1.2.2 Types of MAA
1.3 M2SiO4 Group Members and Zn2SiO4
1.3.1 M2SiO4 Group Members
1.3.2 Zn2 SiO4
1.4 The Research Status of HP Zn2SiO4
1.5 Target,Content,Methods and Significance of This Research
Chapter 2 Synthesis of HPHT Zn2SiO4 Polymorphs
2.1 Synthesis of Starting Materials
2.2 HPHT Experimental Synthesis for HP Polymorphs of Zn2SiO4
2.2.1 Preparation for Starting Materials for Zn2SiO4 Polymorphs Synthesis
2.2.2 Preparation for Anvils for HPHT Experiments
Chapter 3 Experimental Methods
3.1 Electron Probe Microanalysis (EPMA)
3.1.1 Introduction
3.1.2 Selection of Standards
3.1.3 Conditions for EPMA
3.2 NMR Spectroscopy
3.2.1 Magic Angle Spinning (MAS) NMR Spectroscopy
3.2.2 29Si NMR Spectroscopy
3.2.3 Conditions for 29Si NMR Analyzing
3.3 Powder X-Ray Diffraction and Structural Analysis
3.3.1 Synchrotron X-Ray Diffraction
3.3.2 Conditions of Conventional X-Ray and Synchrotron X-Ray
3.4 Micro-Raman Scattering Spectroscopy
3.4.1 Interaction with Light.Raman Spectroscopy
3.4.2 Conditions for Micro-Raman Analyzing
Chapter 4 Characterization of Zn2SiO4 Polymorphs
4.1 Chemical Compositions of Zn2SiO4 Polymorphs
4.2 29Si MAS NMR Spectra of Zn2SiO4 Polymorphs
4.3 Powder X-Ray Diffraction Patterns and Structural Analysis
4.4 Micro-Raman Spectroscopy of Zn2SiO4 Polymorphs
Chapter 5 Solving Crystal Structure of Phase Ⅲ and Phase Ⅳ
5.1 Structure Determination by Powder Diffraction (SDPD) Method
5.2 A Useful Computer Program FOX for SDPD
5.3 Crystal Structure Refinement for Phase Ⅲ and Phase Ⅳ
5.3.1 Read Powder Diffraction Data from the Text File
5.3.2 Indexed by TREOR90
5.3.3 Space Group Estimation
5.3.4 Refinement of Crystal Structures of Phase Ⅲ and Phase Ⅳ by RIETAN-FP Program
Chapter 6 Crystal Structures of Phase Ⅲ and Phase Ⅳ
6.1 The Results of Refinement from RIETAN-FP Program
6.2 The Obtained Crystal Structures of Two HP Zn2SiO4 Polymorphs
6.2.1 The Detailed Crystal Structure Information of Phase Ⅲ
6.2.2 The Detailed Crystal Structure Information of Phase Ⅳ
Chapter 7 Discussion
7.1 Comparison of Zn2SiO4 and M2SiO4
7.2 The Phase Transformation of Zn2SiO4 Polymorphs (from Phase Ⅰto Phase Ⅳ)
7.2.1 Phase Ⅰ
7.2.2 Phase Ⅱ
7.2.3 Phase "Transformation" from Phase Ⅰ to Phase Ⅳ
7.2.4 Comparison of ZnzSiO4 and ZneGeO4
7.3 Comparison of Zn2SiO4 and A2BX4 Type Inorganic Compounds
Chapter 8 Conclusion
References