氰根桥联Ni(Ⅱ)-Fe(Ⅲ)类纳米分子磁体磁性及穆斯堡尔谱研究  

Magnetism and Mssbauer spectra of cyanide-bridged Ni-Fe nano-molecular-magnets

作　　者：韩薇[1] 常树全[1] 戴耀东[1] 陈达[1] 黄彦君[2] 

机构地区：[1]南京航空航天大学核科学与工程系,南京210016 [2]南京大学物理系,南京210093

出　　处：《物理学报》2008年第4期2493-2499,共7页Acta Physica Sinica

摘　　要：用溶液共沉淀法合成了普鲁士蓝类分子磁体化合物Ni3[Fe(CN)6]2.8.2H2O,使用透射电子显微镜、元素分析仪、X射线荧光光谱仪、X射线衍射仪、傅里叶变换红外光谱仪、超导量子干涉仪对配合物的结构及磁性能进行了分析研究.结果表明:产物为颗粒状,粒径为20—30nm,晶体结构为面心立方;当温度从60K降至5K时,配合物表现为从顺磁相到铁磁相的转变,相变温度为22.8K,分析得出Ni(Ⅱ)和Fe(Ⅲ)之间通过氰根以铁磁形式耦合.采用变温穆斯堡尔谱对其磁性机理进行了分析,得到了与磁测量相符合的结果.Nanoparticles of Prussian blue analogues Ni3 [ Fe（CN）6 ]· 8.28H2O have been successfully synthesized by co-precipitation method. The nanoparticles were characterized by elemental analysis, X-ray diffraction, Fourier transform infrared spectrometry and transmission electron microscopy. Magnetic measurement was carried by superconducting quantum interference device magnetometer and the result showed the the transition temperature Tc = 22.8 K. The interaction between Ni（ Ⅱ ） and Fe（Ⅲ） was identified to be a kind of ferromagnetic coupling and was clearly explained by molecular orbital theory. The Mossbauer spectra have been used to explain the origin of magnetism.

关 键 词：普鲁士蓝 磁性 穆斯堡尔谱 

分 类 号：O482[理学—固体物理] O561[理学—物理]