The Volumetric Properties of Silicate Melts: A New Technique for High Precision Measurements

这个项目是为了最终开发一种新技术，直接测量硅酸盐液体的体积变化作为温度和压力的函数。与现有的体积测量技术相比，这项新技术可以在更大的温度和粘度范围内工作，并且可以以至少一个数量级的精度测量体积变化。这项技术的最终发展将包括测量热膨胀率受到很好限制的材料，并与现有数据进行比较。在1 bar下完成技术开发后，将对cao - na20 - al2o3 - sio2体系中硅酸盐液体从低于Tg到1600℃的热膨胀率进行多次测量。此外，还将探索在低于其液体的温度下容易结晶的硅酸盐液体的结晶V的原位测量。

This project is for final development of a new technique that directly measures volumetric changes of silicate liquids as a function of temperature and pressure. This new technique will operate over a larger range in temperature and viscosity than is currently accessible with existing volumetric techniques, and will measure volume changes to at least an order of magnitude greater precision. Final development of this technique will include measurements of materials whose thermal expansivities are well constrained, and comparisons to existing data. Having completed development of the technique at 1 bar, several measurements will be made of the thermal expansivity of silicate liquids in the system CaO-Na2O-Al2O3-SiO2 from below Tg to 1600oC. In addition, in situ measurements of V of crystallization of silicate liquids that crystallize readily at temperatures below their liquids will also be explored.