Preparation and magnetic properties of Ba2Co2Fe28O46 nanocrystals
文献类型：期刊论文
| 作者 | Xiong, G ; Mai, ZH |
| 刊名 | JOURNAL OF APPLIED PHYSICS
 |
| 出版日期 | 2000 |
| 卷号 | 88期号:1页码:519 |
| 关键词 | BARIUM FERRITE PARTICLES HEXAGONAL FERRITES FINE PARTICLES SIZE COPRECIPITATION NANOPARTICLES DYNAMICS CLUSTERS |
| ISSN号 | 0021-8979 |
| 通讯作者 | Xiong, G (reprint author), Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China. |
| 中文摘要 | Ba2Co2Fe28O46 nanocrystals were synthesized through a stearic acid sol-gel method. The reaction temperatures were notably lower than that of the conventional ceramic method. The nanocrystalline particles obtained at 750 degrees C were spherical in shape with grain sizes ranging from 10 to 25 nm. Their morphology became more cubic as the heat-treatment temperature was increased. The surface composition of the nanocrystals was found to be different from that of the bulk Ba2Co2Fe28O46, exhibiting a higher content of Ba and Co. The magnetic properties of these samples are clearly size dependent. The specific saturation magnetization is lower than that of bulk Ba2Co2Fe28O46 and inversely proportional to the grain size D. This can be explained by assuming the existence of a nonmagnetic layer on the surface of the particles. The coercivity of Ba2Co2Fe28O46 nanocrystals reaches a maximum when the particle sizes are approximately equal to 70 nm and then decreases by a factor of 3 as the particle size is further reduced. These results are attributed to superparamagnetic effects in a random distribution of single domain ferromagnetic particles. (C) 2000 American Institute of Physics. [S0021-8979(00)04513-8]. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/51278]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Xiong, G,Mai, ZH. Preparation and magnetic properties of Ba2Co2Fe28O46 nanocrystals[J]. JOURNAL OF APPLIED PHYSICS,2000,88(1):519. |
| APA | Xiong, G,&Mai, ZH.(2000).Preparation and magnetic properties of Ba2Co2Fe28O46 nanocrystals.JOURNAL OF APPLIED PHYSICS,88(1),519. |
| MLA | Xiong, G,et al."Preparation and magnetic properties of Ba2Co2Fe28O46 nanocrystals".JOURNAL OF APPLIED PHYSICS 88.1(2000):519. |
入库方式： OAI收割
来源：物理研究所
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