过渡金属和氮共掺TiO2的氧空位分析及其对磁性的影响

项目名称： 过渡金属和氮共掺TiO2的氧空位分析及其对磁性的影响

项目编号： No.11304083

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 王海英

作者单位： 河南师范大学

项目金额： 30万元

中文摘要： 在传统半导体中掺入金属元素或非金属元素形成磁性半导体，磁性半导体可同时利用电子的电荷属性和自旋属性，其中TiO2基稀磁半导体的载流子浓度较小属于绝缘区，具有室温铁磁性，磁性与氧空位浓度有关。对TiO2基稀磁半导体材料中的氧空位进行研究有助于弄清磁性来源、不同磁矩之间的耦合规律以及铁磁性产生的原因等基本科学问题，从而为有效调控TiO2基稀磁半导体磁性提供依据。本项目将以过渡金属和氮共掺TiO2纳米颗粒为材料体系，调控TiO2纳米颗粒体系中的氧空位，用正电子湮没技术对氧空位的形成、分布和密度进行研究，揭示氧空位、掺杂杂质及它们对载流子浓度和铁磁性的综合影响。通过过渡族金属元素和氮元素含量调控纳米颗粒中铁磁性强弱，弄清磁性与氧空位两者之间的关系。通过理论计算探索稀磁特性的物理本质。

中文关键词： 二氧化钛；稀磁半导体；氧空位；；

英文摘要： The dilute magnetic semiconductors formed by doping metal ions or nonmental ions into tradational semiconductors can take advantages of both charge property and spin property of electrons, among which TiO2-based diluted magnetic semiconductors have low carrier density (in insulator zone) and room temperature saturation magnetization; the magnetism is sensitive with oxygen vacancies density. The detail study on oxygen vacancies of TiO2-based dilute magnetic semiconductors is not only of great advantage for understanding the mechanic of magnetism origin and coupling between magnetic moments term as well as the onset of ferromagnetism. In this prject, the research will focus on the transition metal and nitrogen codoped TiO2 nanoparticles. By controlling the oxygen vacancies in the dilute magnetic semiconductors systems, the forming, distribution and density of oxygen cacancies will be investigated by positron annihilation technique; The interplay between oxygen vacancies, doping impurities, and their effects on the density of charge carries and ferromagnetism will be drawn out; By studying the the relations between the content of transition metal and nitrogen with the strength of room temperature magnetism, to gain the relations between magnetism and oxygen vacancies; The origins of dilute magnetic property of Ti

英文关键词： TiO2；Dilute Magnetic Semiconductor；Oxygen Vacancies；；