A Mossbauer Spectrometer System for Earth Sciences

用于地球科学的穆斯堡尔光谱仪系统

• 批准号: 8904364
• 负责人: Subrata Ghose
• 金额: $ 2.12万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-07-01 至 1990-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8904364&HistoricalAwards=false
• 关键词: Mossbauer; Spectrometer; System; Earth; Sciences

This award provides one-half of the funds required to purchase a Mossbauer spectrometer system to be installed and operated in the Principal Investigator's laboratory in the Department of Geological Sciences at the University of Washington. The remaining funds required will be provided by the University. Mossbauer spectroscopy on Fe-57 is a valuable tool for the study of a variety of phenomena of geochemical interest. The new spectrometer will be capable of very high resolution and equipped with a high-temperature furnace and a liquid helium cryostat for the study of earth materials ranging from fine-grained, poorly crystallized iron minerals in a "desert varnish" and oceanic sediments to minerals from igneous and metamorphic rocks and pure synthetic iron silicate minerals. The phenomena to be studied in such samples include oxidation states, characterization of fine- grained ("X-ray amorphous") minerals, order-disorder in ferromagnesian silicates, thermally activated electron delocalization in mixed-valence iron minerals and magnetic phase transitions in iron bearing silicates.

该合同提供了购买穆斯堡尔光谱仪系统所需资金的一半，该系统将在华盛顿大学地质科学系的首席调查员实验室安装和运行。所需的剩余资金将由大学提供。Fe-57上的穆斯堡尔谱学是研究各种地球化学现象的有价值的工具。新的光谱仪将具有非常高的分辨率，并配备一个高温炉和一个液氦低温恒温器，用于研究地球材料，从“沙漠清漆”中的细粒、结晶不良的铁矿物和海洋沉积物，到来自火成岩和变质岩的矿物，以及纯合成铁硅酸盐矿物。在这类样品中需要研究的现象包括氧化态、细粒(“X-射线非晶态”)矿物的表征、铁镁硅酸盐中的有序-无序、混价铁矿物中的热激活电子离域以及含铁硅酸盐中的磁性相变。