Ni_(1.125)Co_(0.375)[Fe(CN)_6]·6.8H_2O的磁性研究  

Magnetic Properties of Ni_(1.125)Co_(0.375)[Fe(CN)_6]·6.8H_2O

作　　者：卫丽娜[1] 刘敏[1] 唐国栋[1] 黄海富[1] 梁福沛[2] 陈楠[3] 何云[1] 

机构地区：[1]广西师范大学物理与电子工程学院,广西桂林541004 [2]广西师范大学化学化工学院,广西桂林541004 [3]南京大学物理系,江苏南京210093

出　　处：《广西师范大学学报（自然科学版）》2008年第3期49-52,共4页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(20461001);广西自然科学基金资助项目(0447029)

摘　　要：合成了多金属普鲁士蓝类化合物Ni1.125Co0.375[Fe(CN)6].6.8H2O,室温穆斯堡尔谱和红外光谱研究表明金属离子通过氰根成键即Fe(s=1/2)—CN—(Co/Ni)(96%)和Fe(s=5/2)—NC—(Co/Ni)(4%)。超导量子干涉仪(SQUID)场冷却表明:在16 K时化合物从顺磁向铁磁转变,拟合获得顺磁居里点为16.508 K,说明此化合物是铁磁相互作用,当外场达到0.2 T时,零场冷却和场冷却下的磁化率随温度变化曲线几乎重合,为磁畴动力学行为引起的。A multi-metal Prussian blue compound Ni1.125Co0.375[Fe（CN）6]·6.8H2O has been synthesized. Mossbauer spectroscopy at room temperature measurement and IR spectra studies indicate that the metal ions are bonded through Cyanide ligand in this compound,i, e. ：Fe^Ⅲ（s=1/2）-CN-（Co^Ⅱ/Ni^Ⅱ） and Fe^Ⅲ（s=5/2）-NC-（Co^Ⅱ/Ni^Ⅱ）. A paramagnetic to ferromagnetic transition is found at about 16 K in magnetization study,and a paramagnetic curie temperture θ= 16. 508 K was observed in fitting according to Curie-Weiss law. That means ferromagnetic interaction. When the field reaches 0. 2 T,the magnetic domain wall dynamics give rise to the overlap of the zero field cooling and field cooling susceptibility versus temperature curves.

关 键 词：穆斯堡尔谱 场冷却 铁磁相互作用 顺磁居里点 

分 类 号：O482.52[理学—固体物理]