Polarized Conversion Electron Mossbauer Studies of Layered Ferroelectric Films

层状铁电薄膜的极化转换电子穆斯堡尔研究

• 批准号: 9310656
• 负责人: Clyde Kimball
• 金额: $ 5万
• 依托单位: Northern Illinois University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-01 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9310656&HistoricalAwards=false
• 关键词: Polarized; Conversion; Electron; Mossbauer; Studies

9310656 Kimball A study of the dynamics of valence and structural behavior in ferroelectric materials and their analogues will be explored by a combination of Mossbauer spectroscopy and synchrotron radiation. The efficacy of combining high resolution X-ray Absorption Near Edge Spectroscopy and Mossbauer effect measurements to clarify valence fluctuation behavior will be examined. Polarized Mossbauer radiation sources will be used in the laboratory to delineate anisotropic interactions near ferroelectric phase transitions. Synchrotron-based Mossbauer measurements in the time-domain will be made to study non-equilibrium behavior such as photon induced states in ferroelectric materials. %%% The proposed research program is of an exploratory nature and may have an important impact in providing new insights for the understanding of ferroelectric materials and ferroelectric behavior. The study of polarization phenomena is relevant to a number of critical problems in ferroelectric thin films for non- volatile memory applications. The dynamics of valence and structural behavior in these materials and their analogues will be explored by a combination of Mossbauer spectroscopy and synchrotron radiation. Polarized Mossbauer radiation sources will be used in the laboratory to delineate anisotropic interactions near ferroelectric phase transitions. Synchrotron-based Mossbauer measurements in the time-domain will be made to study non- equilibrium behavior caused by radiation-induced states. ***

用穆斯堡尔光谱和同步辐射相结合的方法研究铁电材料及其类似物的价态动力学和结构行为。结合高分辨率x射线吸收近边光谱和穆斯堡尔效应测量来澄清价涨落行为的有效性将被检验。偏振穆斯堡尔辐射源将在实验室中用于描述铁电相变附近的各向异性相互作用。基于同步加速器的时域穆斯堡尔测量将用于研究铁电材料中的非平衡态，如光子诱导态。提出的研究计划具有探索性，可能对理解铁电材料和铁电行为提供新的见解产生重要影响。极化现象的研究关系到用于非易失性存储器的铁电薄膜的许多关键问题。这些材料及其类似物的价态和结构行为的动力学将通过穆斯堡尔光谱和同步辐射的结合来探索。偏振穆斯堡尔辐射源将在实验室中用于描述铁电相变附近的各向异性相互作用。基于同步加速器的时域穆斯堡尔测量将用于研究由辐射诱导态引起的非平衡行为。＊＊＊