Time and Temperature Stability of Magnetization - A Study onMagnetite and Titanomagnetite Prepared by the Glass-Ceramic Method

磁化时间和温度稳定性——微晶玻璃法制备磁铁矿和钛磁铁矿的研究

• 批准号: 8707428
• 负责人: Subir Banerjee
• 金额: $ 7.33万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1988-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8707428&HistoricalAwards=false
• 关键词: Time; Temperature; Stability; Magnetization; Study

At the Asilomar Workshop on Rock Magnetism (September 16-19, 1986) it was unanimously agreed that the next generation of paleomagnetic problems which impact on geomagnetic field generation and reversal, tectonics of continental margins and Precambrian continental drift requrie a major increase in our knowledge of the effects of time and temperature on the magneti>zation of pure m agnetite and titanomagnetite. The PIs have d a materials synthesis technique, the glass-ceramic method, which produces uniform grains ranging in size from 50 nm to 100 um in a state of low internal stress as seen from their magnetic hysteresis and thermoremance properties. They study the effects of applied field, temperature and internal stress on the acquisition and stability of thermo-viscous magnetization. The results will be specially relevant to test whether domain wall/stress interaction through "disaccommodation" or "aftereffect" phenomenon is important for terrestrial samples and may lead to methods for removing undesirable but relatively stable viscous magnetization. These studies will be comple>mentary to those now being carried out by Halgedahl and Moskowitz on the role of domain wall generation and movement in viscous magnetization.

在Asilomar岩石磁性研讨会上（9月 16-19，1986年），一致同意下一代 影响地磁场的古地磁问题 生成和反转，大陆边缘的构造， 前寒武纪大陆漂移需要我们的 了解时间和温度对磁化的影响 纯磁铁矿和钛磁铁矿。 私家侦探 一种材料合成技术， 方法，该方法产生的均匀颗粒的大小范围从 50 nm至100 μ m的低内应力状态下， 它们的磁滞和热阻特性。 他们 研究了外加磁场、温度和内部温度对 重点研究了热粘性的获得和稳定性 磁化 结果将与测试特别相关 无论是通过“失稳”或“失稳”的畴壁/应力相互作用， “后效”现象对于陆地样本很重要 并且可以导致用于去除不期望的但相对 稳定粘性磁化 这些研究将是复杂的， 这些现在正在进行的哈尔格达尔和莫斯科维茨的作用， 在粘性磁化中畴壁的产生和移动。