CAJ | 학술논문

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.
재N,N-이갑기갑선알(DMF)존재하,이용효-응효기술성공지제비료무정형이양화규기저중균균분포적MnFe_2O_4납미정.유분말X사선연사화전자연사학증료MnFe_2O_4순상적생성. 유분말X사선연사화홍외흡수광보연구료MnFe_2O_4납미정형성과정.첨정석결구적MnFe_2O_4재800℃시개시형성,900℃시기본완성.자성질측량표명재소결도900℃적양품중,MnFe_2O_4납미정실온구유초순자성,78K시위연자성.1000℃ 화1100℃하득도적양품실온화78K시도구유연자성.
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.