Presidential Young Investigator Award: Chemical Diffusion and Oxidation Kinetics in Silicate Glasses

该项目涉及成核/玻璃的实验研究 硅酸盐玻璃中受化学扩散影响的稳定性 和玻璃陶瓷 研究的主要重点是 表征氧化/还原的机制和动力学 在含铁硅酸盐玻璃中， 铁状态对玻璃稳定性和结晶形核的影响。 的 这项研究的结果应该提出新的方法， 玻璃陶瓷材料的制备方法 氧化“，即，化学品的应用/操作 氧的电位梯度，以驱动化学扩散， 随之而来的结构重排和结晶成核 玻璃。 受控氧化还应影响 玻璃中的平衡结构。加上。结晶系统; 控制这种纹理的能力，因此控制某些 玻璃陶瓷的物理性能 的 氧化/还原研究将包括玄武岩玻璃 作品（包括人造和天然）， 表征氧化还原条件对以下动力学的影响： 镁铁质岩浆中的化学扩散和结晶成核作用。

The project deals with an experimental study of nucleation/glass stability as affected by chemical diffusion in sililicate glasses and glass.ceramics. The primary emphasis of the study is to characterize the mechanism(s) and kinetics of oxidation/reduction in iron.bearing silicate glasses and the effect of the valence state of iron on glass stability and crystalline nucleation. The results of this research should suggest novel approaches to the preparation of glass.ceramic materials through `controlled oxidation', i.e., the application/manipulation of a chemical potential gradient of oxygen to drive chemical diffusion and consequent structural rearrangement and crystalline nucleation in the glass. Controlled oxidation should additionally affect the equilibrium texture in the glass.plus.crystalline system; the ability to control this texture, and therefore control certain physical properties of the glass.ceramic. The oxidation/reduction studies will include glasses of basaltic composition (both fabricated and natural) in an attempt to characterize the effect of redox conditions on the kinetics of chemical diffusion and crystalline nucleation in mafic magmas.