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退火对钴掺杂铌酸锂局域结构与磁性的影响
发表时间：2013-05-15 浏览量：1388 下载量：621
| 全部作者： | 陈崇，曾飞，陈超，潘峰 |
| 作者单位： | 清华大学材料科学与工程学院先进材料教育部重点实验室 |
| 摘 要： | 采用高能离子注入的方法制备了Co掺杂铌酸锂（LiNbO3）材料（掺杂原子浓度为3.5%），并采用X射线近邻吸收谱（X-ray absorption near edge structure，XANES）和多重散射第一性原理模拟了掺杂元素的价态和局域结构。结果表明：Co在LiNbO3晶格中取代Nb的位置，价态在二价到三价之间。Co掺杂LiNbO3显示出室温铁磁性，退火处理能增强Co掺杂LiNbO3的磁性。Co的K边XANES表明，退火后LiNbO3材料中O空位的增加是导致磁性增强的主要原因。 |
| 关 键 词： | 特种功能无机非金属材料；铌酸锂；稀磁氧化物；退火 |
| Title： | Influence of annealing on microstructure and magnetic properties of Co-doped LiNbO3 |
| Author： | CHEN Chong, ZENG Fei, CHEN Chao, PAN Feng |
| Organization： | Key Laboratory of Advanced Materials, Ministry of Education, School of Materials Science and Engineering, Tsinghua University |
| Abstract： | In this paper, Co-doped LiNbO3 was prepared by ion beam implantation with Co atom content of 3.5%. The microstructure and magnetic properties of the doped LiNbO3 were investigated. X-ray absorption near edge structure (XANES) was used with first-principles calculation to determine the structure characterization. The results showed that the Co atoms substituted principally the Nb atoms in the LiNbO3 lattice with valence state between +2 and +3. All the samples exhibitd room temperature ferromagnetism. The atomic magnetic moments increased after anealing, which was mediated by the increasing oxygen vacancies after anealing. |
| Key words： | non-metallic inorganic material with special property; LiNbO3; diluted magnetic oxides; annealing |
| 发表期数： | 2013年5月第9期 |
| 引用格式： | 陈崇，曾飞，陈超，等. 退火对钴掺杂铌酸锂局域结构与磁性的影响[J]. 中国科技论文在线精品论文，2013，6（9）：843-846. |
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