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.

该提案是关于技术上重要的一类材料，铌酸锂（LN）和钽酸锂（LT），在电光方面具有巨大潜力。 这些材料对于电光工业的重要性类似于纯硅对于电子工业的重要性。 该项目将集中研究这些材料的纯和掺杂版本的单晶中的缺陷结构，以及通过电子顺磁共振（EPR）和电子核双共振（ENDOR）研究的内在和外在缺陷的相互影响。 系统研究将在蒙大拿州立大学新购买的布鲁克EPR光谱仪中进行。 这些样品将从世界各地的晶体种植者那里获得，并通过与当地公司，科学材料，博兹曼，MT。 研究生和本科生，包括妇女和代表性不足的群体的成员的参与将得到优先考虑。该提案涉及一类在电光应用方面具有巨大潜力的材料，即用电场操纵光。 在这种情况下，铌酸锂和钽酸锂的相关的两种材料将在其晶体形式进行研究。 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，它们中的缺陷的性质是什么？ 这些问题将使用共振技术来回答，其中材料中的电子将在磁场中被激发。 一家靠近研究人员所在大学的公司将参与生产研究所需的晶体。 主要调查员将强调妇女和少数民族参与该项目。