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| SiO_2基底中MnFe_2O_4纳米晶的制备与表征 | |
| 引用本文： | 徐莉,邹文琴,洪健民,池杏微,宰德欣.SiO_2基底中MnFe_2O_4纳米晶的制备与表征[J].化学研究与应用,2009,21(12). |
| 作者姓名： | 徐莉 邹文琴 洪健民 池杏微 宰德欣 |
| 作者单位： | 1. 南京林业大学理学院,江苏,南京,210037;南京大学配位化学国家重点实验室,江苏,南京,210093 2. 南京大学物理系,固态微结构国家重点实验室,江苏,南京,210093 3. 南京大学分析测试中心,江苏,南京,210093 4. 南京林业大学理学院,江苏,南京,210037 |
| 基金项目： | 国家自然科学基金项目，江苏省自然科学基金项目 |
| 摘 要： | 在N,N-二甲基甲酰胺(DMF)存在下,以溶胶-凝胶技术成功地制备了无定形二氧化硅基底中均匀分布的MnFe_2O_4纳米晶.由粉末X射线衍射和电子衍射确证了MnFe_2O_4纯相的生成. 由粉末X射线衍射和红外吸收光谱研究了MnFe_2O_4纳米晶形成过程.尖晶石结构的MnFe_2O_4在800℃时开始形成,900℃时基本完成.磁性质测量表明在烧结到900℃的样品中,MnFe_2O_4纳米晶室温具有超顺磁性,78K时为软磁性.1000℃ 和1100℃下得到的样品室温和78K时都具有软磁性. |
| 关 键 词： | 纳米晶 溶胶-凝胶 磁性质 |
Preparation and characterization of MnFe_2O_4 nanocrystalline dispersed in a silica matrix |
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| XU Li,ZOU Wen-qin,HONG Jian-min,CHI Xing-wei,ZAI De-xin.Preparation and characterization of MnFe_2O_4 nanocrystalline dispersed in a silica matrix[J].Chemical Research and Application,2009,21(12). | |
| Authors: | XU Li ZOU Wen-qin HONG Jian-min CHI Xing-wei ZAI De-xin |
| Abstract: | Uniformly dispersed MnFe_2O_4 nanocrystals were successfully synthesized in an amorphous silica matrix by the sol-gel method in the presence of N,N-dimethylformamide (DMF). The formation of pure MnFe_2O_4 was confirmed by powder X-ray diffraction (XRD)and electron diffraction. The structural development of MnFe_2O_4 nanocrystals was followed by powder X-ray diffraction and IR absorption spectroscopy. The formation of spinel structure of MnFe_2O_4 started at 800℃,and completed at 900℃. Field-dependent magnetization measurements at room temperature indicated superparamagnetic nature of MnFe_2O_4 nanocrystals in N-900.N-900 at 78K and N-1000 and N-1100 both at room temperature and 78K exhibited soft magnetic behavior. |
| Keywords: | MnFe_2O_4 DMF MnFe_2O_4 nanocrystalline sol-gel DMF magnetic properties |
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