Technician Support for Geoscience Research in Transmission Electron Microscopy

透射电子显微镜地球科学研究的技术人员支持

• 批准号: 0113345
• 负责人: Peter Buseck
• 金额: $ 21万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-10-01 至 2004-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0113345&HistoricalAwards=false
• 关键词: Technician; Support; Geoscience; Research; Transmission

0113345BuseckThis grant provides partial salary support for an electron microscopist who will help maximize the geological, mineralogical, and geochemical capabilities of two TEMs that will be installed in 2001 within the ASU Center for High Resolution Electron Microscopy. These instruments were obtained to develop new techniques and measurements in materials science and physics, and the goal of the new position is to become familiar with those techniques and adapt them for research in the geological sciences. One of the instruments will have an electron beam that can be made less than 0. 2 nm in diameter. We will use this capability to analyze grain boundaries, dislocation cores, and surface layers on the atomic scale and will obtain crystallographic data from within unit cells through electron nanodiffraction. The other instrument will contain a Gatan imaging filter for measurements that will allow elemental mapping on the sub-nanometer scale. It will also have an environmental cell for studies under controlled atmospheres. This cell will maintain a relatively high gas pressure of up to 50 torr in the sample chamber, while retaining the high-resolution capabilities of the TEM. Specimen heating and dynamic image recording will allow chemical reactions to be followed at close to the atomic scale. We will use this to study minerals that are unstable in the vacuum of the electron microscopes. These include clay minerals, the green rusts, gypsum and related hydrated sulfates as well as dehydroxylation reactions and valence changes in minerals.***

0113345Buseck这笔赠款为一名电子显微镜师提供部分工资支持，该电子显微镜师将帮助最大限度地发挥两台 TEM 的地质、矿物学和地球化学能力，这两台 TEM 将于 2001 年安装在亚利桑那州立大学高分辨率电子显微镜中心。 获得这些仪器是为了开发材料科学和物理学的新技术和测量，新职位的目标是熟悉这些技术并将其应用于地质科学研究。其中一台仪器将具有直径小于 0. 2 nm 的电子束。我们将利用这种能力在原子尺度上分析晶界、位错核心和表面层，并通过电子纳米衍射从晶胞内获得晶体学数据。另一台仪器将包含用于测量的 Gatan 成像滤光片，允许在亚纳米尺度上进行元素映射。它还将有一个环境单元，用于在受控气氛下进行研究。该单元将在样品室中维持高达 50 托的相对较高气压，同时保留 TEM 的高分辨率能力。样品加热和动态图像记录将允许在接近原子尺度上跟踪化学反应。我们将用它来研究在电子显微镜真空中不稳定的矿物。 其中包括粘土矿物、绿锈、石膏和相关的水合硫酸盐以及矿物中的脱羟基反应和价态变化。***