High Temperature Solid-Solid Reaction Kinetics Via Dynamic X-Ray Diffraction

利用动态X射线衍射（DXRD）和其他技术研究了两个反应固态系统。研究的体系有：（1）氧化钙与二氧化硅反应生成硅酸钙;（2）由胶态勃姆石和二氧化硅合成莫来石。本研究的目的是（1）在已知动力学行为的体系中获得DXRD获得的数据的定量验证（硅酸钙），（2）将DXRD应用于多反应体系（莫来石），（3）确定颗粒尺寸和水蒸气对固-固反应中扩散和动力学作用的影响，（4）确定了溶胶-凝胶法制备莫来石的反应顺序和限速步骤。该项目包括首次将DXRD应用于具有未知动力学的系统。这项由研究人员开发的新技术有可能提供比迄今为止更详细的固-固反应系统信息。

Two reacting solid-state systems are investigated using dynamicx-ray diffraction (DXRD) and other techniques. The systems to be studied are (1) the reaction of calcium oxide and silica to form calcium silicates, and (2) the synthesis of mullite from colloidal boehmite and silica. The objectives of the study are (1) to obtain quantitative verification of DXRD-acquired data in a system of known kinetic behavior (calcium silicate), (2) to apply DXRD to a multiply reacting system (mullite), (3) to determine the effects of particle size and water vapor on the roles of diffusion and kinetics in solid-solid reactions, and (4) to determine the reaction sequence and rate-limiting steps in the production of sol-gel-derived mullite. This project includes the first application of DXRD to a system with unknown kinetics. This new technique, developed by the investigator, has the potential to provide more detailed information on solid-solid reacting systems than has been possible up to now.