Magnetic and spectroscopic studies of ferricenium tetrabromoferrate (III),[Fe(C_5H_5)_2]~+[FeBr_4]~-,a soft ferromagnet and its iodo analogue

K Padmakumar; T Pradeep; P T Manoharan; J Ensling; P Gutlich

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Magnetic and spectroscopic studies of ferricenium tetrabromoferrate (III),[Fe(C_5H_5)_2]~+[FeBr_4]~-,a soft ferromagnet and its iodo analogue

机译：四溴高铁酸铁（III），[Fe（C_5H_5）_2]〜+ [FeBr_4]〜-，软铁磁体及其碘类似物的磁性和光谱研究

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Detailed studies of the properties of ferricenium tetrabromoferrate (III) using electron paramagnetic resonance (EPR) and Mossbauer spectroscopy reveal; that this material undergoes a magnetic transition at 13.2K.The origin of this transition has been tracted to the near neighbor ferrimagnetic coupling as evidenced by a broadening and the subsequent disappearance of an EPR line due to the ~6A_1 ground state of FeBr_4~- and an appearance of the Zeeman split Mossbauer spectrum,the latter in concurrence with earlier reports.Infrared spectrum shows the emergence of new bands around the magnetic ordering temeprature.Detailed magnetization measurements as a function of temperature and field clearly indicate long range ferromagnetic ordering at a temperature below 4 K.This is corroborated by Mossbauer results with the appearance of another transition and a six line pattern due to the ferricenium cation at 2.9K.The mechanism for ferromagnetic coupling is discussed.The change in EPR line-width and the appearance of two new EPR lines below 20 K give additional evidence to the other experimental observations.The EPR,Mossbauer and IR studies suggest that to such ordering exists in the analogous C_(10)H_(10)Fe_2I_4,probably due to a structural transition at low temperature hindering magnetic ordering.

机译：使用电子顺磁共振（EPR）和Mossbauer光谱对四溴高铁酸铁（III）的性质进行的详细研究表明：这种材料在13.2K处经历了磁跃迁。这种跃迁的起源已被束缚到了近邻的亚铁磁耦合中，这是由于FeBr_4〜-〜6A_1基态引起的EPR线变宽和随后消失所证明的。 Zeeman分裂Mossbauer光谱的出现，后者与先前的报道相吻合。红外光谱显示在磁序温度范围周围出现了新的带。详细的磁化强度随温度和磁场的变化清楚地表明在一定温度下长距离铁磁有序低于4 K.Mossbauer结果证实了这一点，由于2.9K的铁阳离子，出现了另一个跃迁和六线模式。讨论了铁磁耦合的机理.EPR线宽的变化和两个的出现低于20 K的新EPR谱线为其他实验观察提供了额外的证据。EPR，Mossbauer和IR研究表明可见，类似的C_（10）H_（10）Fe_2I_4中存在这种排序，可能是由于低温下的结构转变阻碍了磁性排序。

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《Indian Journal of Chemistry, Section A. Inorganic, Physical, Theoretical & Analytical》 |2003年第9期|共12页
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K Padmakumar; T Pradeep; P T Manoharan; J Ensling; P Gutlich;
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Magnetic and spectroscopic studies of ferricenium tetrabromoferrate (III),[Fe(C_5H_5)_2]~+[FeBr_4]~-,a soft ferromagnet and its iodo analogue

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