Carbonates under shock compression: stability, phase transitions, and chemical reactions with silicates

冲击压缩下的碳酸盐：稳定性、相变以及与硅酸盐的化学反应

• 批准号: 264049573
• 负责人: Professor Dr. Edwin Kroke
• 金额: --
• 依托单位: Institut für Anorganische Chemie
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/264049573?language=en
• 关键词: Carbonates; under; shock; compression; stability

The proposed project 05 is focused on the understanding of stabilities, phase transitions, formation of high pressure phases and chemical reactions of carbonates upon application of dynamic high pressures above 15 GPa. After fundamental studies on the pure synthetic carbonates of Ca, Mg and Sr, experiments with CaMg(CO3)2and FeCO3 as well as mixtures of these carbonates with selected silicate phases will follow. In parallel, the flyer-plate shock wave method well established in our laboratory will be further developed. In order to prevent carbon dioxide formation and recombination with oxides to the corresponding carbonates on the release path, we will use laminated flyer-plates allowing to apply pressures of > 200 GPa at relatively low temperatures without melding the specimens. In all cases full sample recovery is provided by an especially designed impedance corrected sample container. This will provide opportunities to use analytical techniques which require larger amounts such as bulk elemental analysis of light elements (C, O and H), powder-XRD with Rietveld analysis, solid-state NMR studies, thermal analysis investigations (TG-MS, DTA, DSC) and studies on the product morphologies. Besides, the products will be analyzed with the (in situ) techniques used for the diamond anvil cell samples of the other groups in the research unit FOR2125.

拟议的项目05侧重于了解碳酸盐在15 Gpa以上的动态高压下的稳定性、相变、高压相的形成和化学反应。在对纯合成碳酸钙、镁和锶进行基础研究后，接下来将进行CaMG(CO3)2和FeCO3的实验，以及这些碳酸盐与选定的硅酸盐相的混合物。同时，我们实验室建立的飞板激波方法也将得到进一步发展。为了防止二氧化碳的形成和在释放路径上与相应碳酸盐的氧化物重新结合，我们将使用叠层飞片，允许在相对较低的温度下施加&gt；200 Gpa的压力，而不会熔化样品。在所有情况下，完全样品回收都是由特别设计的阻抗校正样品容器提供的。这将提供使用需要大量分析技术的机会，如轻元素(C、O和H)的大量元素分析、粉末X射线衍射和Rietveld分析、固态核磁共振研究、热分析研究(TG-MS、DTA、DSC)和产品形貌研究。此外，产品将用FOR2125研究单位其他组的钻石砧座样品的(原位)技术进行分析。