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钴、碳共掺杂铌酸锂的局域结构与磁性

发表时间:2012-05-15  浏览量:1046  下载量:458
全部作者: 盛蓬,曾飞,陈超,潘峰
作者单位: 清华大学材料科学与工程系先进材料教育部重点实验室
摘 要: 采用高能离子多能量注入的方法制备了Co原子浓度为3.5%,C原子浓度分别为2%,3%,4%的Co,C共掺杂LiNbO3薄膜,研究了掺杂浓度和退火工艺对LiNbO3局域结构和磁性的影响。Co的K边X射线近邻吸收谱(X-ray absorption near edge structure, XANES)证明:对低的C掺杂浓度样品,Co取代了Nb的位置;当C浓度较高时,有金属Co析出。磁性分析结果表明:随着C浓度的增加,LiNbO3样品的磁性得到增强。此外,C掺杂导致结构缺陷的增加被认为是掺杂LiNbO3磁性增强的起因。
关 键 词: 材料物理;LiNbO3;稀磁氧化物;X射线近邻结构
Title: Microstructure and magnetic properties of Co and C co-doped LiNbO3
Author: SHENG Peng, ZENG Fei, CHEN Chao, PAN Feng
Organization: Key Laboratory for Advanced Materials of Ministry of Education, Department of Materials Science and Engineering, Tsinghua University
Abstract: In this paper, Co and C co-doped LiNbO3 was prepared by ion beam implantation with Co atom content of 3.5% and C atom contents of 2%, 3%, 4%, respectively. The microstructure and magnetic properties of the doped LiNbO3 were investigated. With low concentration of C, structure characterization using X-ray absorption near edge structure (XANES) determined that the Co atoms substituted principally the Nb atoms in the LiNbO3 lattice. When the atom concentration of C achieved 4%, Co clusters were precipitated from the LiNbO3 lattice. The magnetic properties of the doped LiNbO3 are enhanced as the increase of C contents. The ferromagnetism in (Co, C)-doped LiNbO3 is proposed to be mediated by the structure defects induced by C doping.
Key words: materials physics; LiNbO3; diluted magnetic oxides; X-ray absorption near edge structure
发表期数: 2012年5月第9期
引用格式: 盛蓬,曾飞,陈超,等. 钴、碳共掺杂铌酸锂的局域结构与磁性[J]. 中国科技论文在线精品论文,2012,5(9):814-819.
 
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