Acquisition of Electrical Impedance Analyzer for the ASU Geological Sciences Mineral and Rock Physics Laboratory

0092412 Tyburczy该补助金为亚利桑那州州立大学（ASU）矿物和岩石物理实验室购买电化学阻抗分析系统的费用提供部分支持。 PI是亚利桑那州立大学的地质学教授，将利用该设备研究地球材料的电特性。 大地电磁学和地磁测深揭示了在各种地壳和地幔环境中的异常高电导率区。 为了正确地反演和解释大地电磁响应函数，必须在实验室中确定地球材料在适当频率范围内的电响应。 购买的设备将包括一个阻抗分析系统，其中包括一个频率响应分析仪、一个恒电位仪、一台个人计算机和用于数据采集/控制和数据分析/建模的专用软件。 该设备将与高温气体混合炉、多砧高压装置以及其他类型的熔炉和压力容器连接。 利用该设备进行的研究包括：1）低熔体分数下熔体成分和结构对部分熔融体系体电性质的影响; 2）压力和温度对地壳和地幔无水矿物和岩石电性质的影响; 3）含水矿物和名义上无水矿物中氢对电性质的影响。 结果将被解释的等效电路，可以相关的模型的离子过程。 这些研究的结果将是重要的大地电磁数据的解释和建模，也将揭示在各种地质环境中的物理传输过程的新的光。 最终的好处将是更详细地了解地球内部深处物质的温度分布和物理状态。

0092412 Tyburczy This grant provides partial support for the costs of acquiring an electrochemical impedance analysis system for the Mineral and Rock Physics Laboratory at Arizona State University (ASU). The PI is Professor of Geology at Arizona State University and will utilize this equipment for studies of the electrical properties of earth materials. Magnetotellurics and geomagnetic depth sounding have revealed zones of anomalously high electrical conductivity in a variety of crustal and mantle environments. In order to properly invert and interpret magnetotelluric response functions, the electrical response of Earth materials over a suitable frequency range must be determined in the laboratory. The equipment purchased will consist of an impedance analysis system consisting of a frequency response analyzer (FRA), a potentiostat, a personal computer and specialized software for data acquisition/control and data analysis/modeling. The equipment will be interfaced with a high temperature gas mixing furnace, with a multiple anvil high pressure device, and with other types of furnaces and pressure vessels. Studies to be pursued with this equipment include 1) the influence of melt composition and texture at low melt fraction on the bulk electrical properties of partially molten systems 2) effects of combined pressure and temperature on electrical properties of anhydrous minerals and rocks of the crust and mantle, and 3) the influence of hydrogen in hydrous and nominally anhydrous minerals on electrical properties. The results will be interpreted in terms of equivalent electrical circuits that can be related to models of ionic processes. The results of these studies will be important for the interpretation and modeling of magnetotelluric data and will also shed new light on physical transport processes in a variety of geological environments. The ultimate benefits will be more detailed understanding of the temperature profile and physical state of matter at depth in the Earth's interior.***