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Meeting Materials Science & Technology 2020
Symposium Emergent Materials under Extremes and Decisive In Situ Characterizations
Presentation Title High Pressure & Temperature Investigation into Thorium Orthosilicates
Author(s) Andrew Charles Strzelecki, Jason Baker, Stella Chariton, Vitali Prakapenka, Hongwu Xu, Mostafa Ahmadzadeh, John McCloy, Paul Estevenon, Adel Mesbah, Nicolas Dacheux, Xiaofeng Guo
On-Site Speaker (Planned) Andrew Charles Strzelecki
Abstract Scope The thorium orthosilicate minerals, thorite and huttonite, are isochemical (ThSiO4), but differ in crystal structure. Thorite is isostructural to zircon which is tetragonal and belongs to the I41/amd space group. Huttonite, the high temperature polymorph, is isostructural to monazite being monoclinic and crystallizes into the P21/n space group. Other tetravalent metal orthosilicate, such as ZrSiO4, HfSiO4, and USiO4 are known to exhibit a pressure induced phase transition from the zircon structure to scheelite structure (I41/a). However, ThSiO4 may not have such a transition indicated previously by computational work. The huttonite phase has only been investigated experimentally under elevated temperature conditions. In this presentation we will highlight the first ever experimental work into the pressure induced phase change of thorium orthosilicates utilizing both synchrotron powder x-ray diffraction and Raman spectroscopy. In situ high pressure and high temperature was generated by combination of diamond anvil cells and laser heating.


Characterizing Disordered Crystalline Materials with Pauling’s Rules
Evolution of Structure, Electrical, and Optical Properties in Ti-doped In2O3 Nanocrystals under Pressure
Giant Pressure-induced Enhancements in Electronic Transport and Photoelectric Properties in 2D and 3D Structures
High-speed X-ray Phase Contrast Imaging Analysis of Microscale Shock Response of a Mock Additively Manufactured Energetic Material
High Pressure & Temperature Investigation into Thorium Orthosilicates
Investigations of Materials under Extreme Hydrothermal Conditions Using Synchrotron and Complementary Techniques
Technology Development of In-situ Corrosion Kinetics and Salt Property Measurements

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