| SiO_2基底中MnFe_2O_4纳米晶的制备与表征 |
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| 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) |
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| 作者姓名： | 徐莉 邹文琴 洪健民 池杏微 宰德欣 |
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| 作者单位： | 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;南京大学物理系,固态微结构国家重点实验室,江苏,南京,210093;南京大学分析测试中心,江苏,南京,210093;南京林业大学理学院,江苏,南京,210037 |
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| 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 |
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| 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.
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| 关 键 词： | MnFe_2O_4 纳米晶 溶胶-凝胶 DMF 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) |
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| Authors: | XU Li ZOU Wen-qin HONG Jian-min CHI Xing-wei ZAI De-xin |
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| 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. |
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| Keywords: | MnFe_2O_4 DMF MnFe_2O_4 nanocrystalline sol-gel DMF magnetic properties |
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