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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Exceptionally slow magnetic relaxation in cobalt(II) benzoate trihydrate
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Exceptionally slow magnetic relaxation in cobalt(II) benzoate trihydrate

机译：在钴（II）苯甲酸盐三水合物中特别缓慢的磁性松弛

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摘要

Cobalt(II) benzoate trihydrate prepared by the reaction of CoCO3 with benzoic acid (HBz) in boiling water followed by crystallization has been structurally characterized as a chain-like system with the formula unit [Co(Bz)(H2O)(2)]Bz center dot H2O where the Co(II) atoms are triply linked by one bridging syn-syn benzoato (Bz) and two aqua ligands; additional benzoate counter ions and solvate water molecules are present in the crystal structure. DC magnetic measurements reveal a sizable exchange coupling of a ferromagnetic nature between the Co(II) atoms. At T-N = 5.5 K the paramagnetic phase switches to the antiferromagnetic phase. Though the remnant magnetization is zero, the magnetization curve shows two lobes of a hysteresis loop and the DC relaxation experiments confirm a long relaxation time at T = 2.0 K. AC susceptibility data confirm a slow relaxation of magnetization even in the antiferromagnetic phase. In the absence of the magnetic field, two relaxation channels exist. The relaxation time for the low frequency channel is as slow as tau(LF) 1.6 s and data fitting yields tau(LF) (2.1 K) = 14 s. The high-frequency relaxation time obeys the Orbach process at a higher temperature whereas the Raman process dominates the low-temperature region. Three slow relaxation channels are evidenced at the applied magnetic field B-DC = 0.1 T.
机译：钴（II）苯甲酸甲酯三水合物通过CoCO3与苯甲酸（HBZ）的反应在沸腾的水中来制备，接着结晶已经在结构上表征为连锁系统与式单元[CO（BZ）（H2O）（2）] BZ中心点H2O其中的Co（II）原子三重由一个连接的桥接顺 - 顺benzoato（BZ）和两个AQUA配体;附加苯甲酸抗衡离子和溶剂化物的水分子存在于晶体结构。直流磁测量揭示了一个相当大的交换共同（II）原子之间的铁磁性质的耦合。在T-N = 5.5 k中的顺磁相切换到反铁磁相。虽然剩余磁化为零时，磁化曲线示出了磁滞回线和DC松弛实验的两个瓣确认在T = 2.0 K.交流磁化率数据长弛豫时间确认磁化强度的缓慢弛豫即使在反铁磁相。在不存在磁场的时候，存在2个弛豫信道。弛豫时间对低频信道是一样慢tau蛋白（LF）＆GT; 1.6秒和数据拟合产量tau蛋白（LF）（2.1 K）= 14秒。高频弛豫时间服从奥巴赫过程在较高的温度，而拉曼过程支配低温区域。三个慢松弛通道在所施加的磁场B-DC = 0.1 T.证明

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