Dissertation > Excellent graduate degree dissertation topics show

Investigation of MO2（M=Ti, Zr, Mn） Phase Transitions under High-Pressure and High-Temperature

Author: ZhangHong
Tutor: XiaoWanSheng
School: Guangzhou Institute of Geochemistry
Course: Mineralogical study of ore deposits petrology
Keywords: MO2 High temperature and pressure Raman spectroscopy Synchrotron Radiation EDXD
CLC: O521.23
Type: Master's thesis
Year: 2006
Downloads: 83
Quote: 0
Read: Download Dissertation

Abstract


Existing MO 2 pressure-induced phase transition sequence and high-pressure phase of research results quite different, although the consensus, but there are also conflicting. Three representative dioxide - rutile (YiO 2 ), baddeleyite (the ZrO 2 ), pyrolusite (Based on this fact, this paper MnO 2 ), under quasi-hydrostatic pressure conditions, the use of a laser-heated diamond anvil high-pressure device (DAC) technology and micro-Raman spectroscopy in situ testing and synchrotron radiation energy dispersive X-Ar as the pressure medium, ray in situ testing method, in a certain pressure and temperature range of YiO 2 the ZrO 2 of MnO 2 launched a high-temperature high-pressure phase transition research. The rutile structure TiO ZrO 2 the high pressure Pbcα phase and baddeleyite structure 2 the high pressure Pbcα phase Raman spectra of this thesis, the first time. Raman spectroscopic study of phase transition in rutile high temperature and pressure, the pressure gradually increased, rutile in 13.4GPa and 29.4GPa turn into baddeleyite phase and Pbcα of. Baddeleyite phase into Pbcα phase need to be heated to the relief Shique in smaller pressure interval that rapidly changing, two-phase transition pressure boundary around 28GPa about the: Pbcα phase at room temperature the next until the experimental maximum pressure 63.4 GPa, remains stable. Raman spectroscopic study of the phase transition in the high-temperature and high-pressure baddeleyite baddeleyite phase with increasing pressure has 3.4GPa and 15.3GPa into Pbcα phase and PbCl 2 phase ramp zircon phase transition into Pbcα phase does not need to be heated, and at a lower pressure of about 3.4GPa to shift Pbcα phase transition PbCl 2 phase need heating; formed in comparison with previous studies, soft manganese in the 0 ~ 43GPa the synchrotron radiation EDXD high-temperature high-pressure experiments, and can not get in addition to CaCl 2 phase outside the new high-pressure phase. Relief, CaCl 2 phase when resumed for the rutile phase. Fixed B 0 = 4 to the CaCl 2 phase B 0 230 (4) GPa. This paper presents MO 2 high temperature and pressure to change the general trend: of rutile → CaCl 2 A the phase → α-PbO 2 → baddeleyite facies → Pbcα phase → Pα is (?) phase → PbCl 2 phase according to M 4 different radius size, electronic configuration and electronegativity characteristics, different the phase change of the two oxides and there are some differences, or experiencing one phase change or subjected to a plurality of phase change. This SiO 2 high pressure phase transition sequence study provides new ideas the MO 2 multiforme structure baddeleyite Pbcα, Pα is (?) And PbCl 2 the phase may SiO 2 taken under high pressure, the coordination number of Si changed from 7 to 9, this experiment has yet to be further confirmed.

Related Dissertations

  1. Influence of Doping Effect on Zinc Oxide by First Principles Studies,O614.241
  2. Templated Synthesis of Surface Enhanced Raman Scattering Substrate and Its Application,O657.37
  3. Layer-by-layer Assembly of Nanoparticles for Surface-enhanced Raman Spectroscopy Substrate and the Application in Detection of Organic Molecules,O657.3
  4. Instrument-to-Instrument Calibration Transfer and Standardization of Spectra,O657.33
  5. Based on synchrotron radiation CT imaging of breast cancer quantitative study of microvascular,R318
  6. Ethanol - water Raman spectroscopy and density correlation,O657.37
  7. Research on the Surface Enhanced Raman Spectroscopy of Saliva for the Diagnosis of Lung Cancer,R734.2
  8. Synthesis and Study of S-doped Diamond under High Temperature and High Pressure,TQ164
  9. Software System Design and Realization for Deep Ocean Compact Automatic Raman Spectrometer,O433.4
  10. The Interfacial Structure of Ionic Liquids/Metal Probed by Electrochemistry and SERS,O647.1
  11. SBS thermoplastic elastomer / LLDPE blends sealing performance study,TQ334
  12. Preparation of Sialon bonded PcBN,TQ174.1
  13. The Investigation of Ag’s Addition Effects on Zr57Al15Co28 Metallic Glass,TG139.8
  14. High Temperature and High Pressure Synthesis Study of BC3,O52
  15. Study on the Gamma-Ray Bursts in Fermi Era,P172.3
  16. SWNT adsorption mechanism of aromatic amino acid cluster Synchrotron Radiation Research,TB383.1
  17. Characterization and Analysis of Microstructure for Complex Perovskite Microwave Dielectric Ceramics,TM28
  18. Raman Spectral Analysis of Key Components in Gasoline,TE626.21
  19. Synchrotron Radiation XAFS Research on ZnO from Morph-genetic Transformation,O484.41
  20. The Study of X-ray Detector Based Wire Chamber,TL816.1
  21. Iron- based catalyst organization and synthetic diamond crystals Correlation,TQ164

CLC: > Mathematical sciences and chemical > Physics > High pressure and high temperature physics > High Pressure Physics > The physical properties of the material under high pressure > Phase transition under high pressure
© 2012 www.DissertationTopic.Net  Mobile