Impurity Locations and Mechanisms of Charge Compensation in Stoichiometric Lithium Niobate and Lithium Tantalate Crystals

化学计量铌酸锂和钽酸锂晶体中的杂质位置和电荷补偿机制

• 批准号: 0307267
• 负责人: Galina Malovichko
• 金额: $ 33.99万
• 依托单位: Montana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0307267&HistoricalAwards=false
• 关键词: Impurity; Locations; Mechanisms; Charge; Compensation

This proposal is on a technologically important class of materials, Lithium Niobate(LN) and Lithium Tantalate (LT), of great potential in electro-optics. These materials are of analogous significance to the electro-optics industry as pure Silicon is to the electronics industry. The project will concentrate on studies of defect structures in single crystals of pure and doped versions of these materials as well as on the mutual influence of intrinsic and extrinsic defects studied through Electron Paramagnetic Resonance (EPR) and Electron Nuclear Double Resonance (ENDOR). Systematic studies will be carried out at Montana State University in a newly purchased Bruker EPR spectrometer. The samples will be obtained from crystal growers worldwide and through a partnership with local company, Scientific Materials, Bozeman, MT. Participation of graduate and undergraduate students including women and members of underrepresented groups will be given priority.This proposal deals with a class of materials that have great potential for applications in electro-optics i.e. the manipulation of light with an electric field. Two materials of relevance in this context, Lithium Niobate and Lithium Tantalate will be studied in their crystalline form. Questions to be addressed include the degree of perfection that these crystals can reach and if they are not perfect what is the nature of the defects in them? These questions will be answered using a resonance technique where the electrons in the material will be excited in a magnetic field. A company close to the investigators' university will be involved in producing the requisite crystals for the study. The principal investigator will emphasize the participation of women and minorities in the project.

该建议是在技术上重要的材料类别，即尼橙锂（LN）和坦率锂（LT）中，具有巨大的电磁潜力。 这些材料与纯硅对电子行业一样，对电子启发行业具有类似的意义。 该项目将集中于这些材料纯和掺杂版本的单晶缺陷结构的研究，以及通过电子顺磁共振（EPR）和电子核双共振（Endor）研究的固有和外部缺陷的相互影响。 新购买的Bruker EPR光谱仪将在蒙大拿州立大学进行系统研究。 样品将从全球的水晶种植者那里获得，并通过与当地公司，科学材料（Bozeman）的合作伙伴关系获得。 研究生和本科生的参与包括妇女和代表性不足的团体的成员。该提案与一类材料进行交易，这些材料具有很大的潜力，可以在电场中应用，即用电场操纵光线。 在这种情况下，将以晶体形式研究两种相关材料，尼橙锂和诱导锂。 要解决的问题包括这些晶体可以达到的完美程度，如果它们不完美，它们中缺陷的本质是什么？ 这些问题将使用共振技术回答，其中材料中的电子将在磁场中受到激发。 接近调查人员大学的公司将参与生产该研究所需的晶体。 首席研究人员将强调妇女和少数民族在项目中的参与。