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用VSO_4·2.5H_2O与K_3[Cr(CN)_6·2.5H_2O反应,合成了一个结晶的普鲁士蓝类室温分子磁体K_(0.45)V_(1.12)~ⅡV_(0.19~-)~Ⅲ[Cr(CN)_6(SO_4)_(0.13)·4.34H_2O,对其结构和磁性进行了研究.主要结果如下:XRD数据表明,该化合物具有类普鲁士蓝的面心立方结构,a=1.178nm.由半峰宽估算的晶粒的平均粒径约为5nm.化合物的T_C为34OK,矫顽力H_C在40～310K范围基本保持在5～6 Oe,1.83K时增至120 Oe.化合物具有较好的空气稳定性,空气中放置10d后T_C仍为340K,矫顽力H_C稍有增加.与已报道的同体系的另几个室温磁体比较,其显著的特点是,亚铁磁长程有序相与自旋玻璃态共存,自旋玻璃行为由频率依赖的交流磁化率所证实.
A crystalline Prussian blue room temperature magnet K_ (0.45) V 1.12 ~ ⅡV 0.19 ~ - Ⅲ [Cr (CN) was synthesized by the reaction of VSO_4 · 2.5H_2O with K_3 [Cr (CN) _6 · 2.5H_2O. ) _6 (SO_4) _ (0.13) · 4.34H_2O.The main results are as follows: The XRD data showed that the compound has a face-centered cubic cubic structure with Prussian blue, a = 1.178nm. The average grain size of the broadly estimated grains is about 5 nm, the T_C of the compound is 34OK, the coercivity H_C is basically maintained at 5 ~ 6 Oe in the range of 40 ~ 310K, and 120 Oe at 1.83 K. The compound has better air The stability of T_C is still 340K and the coercivity H_C is slightly increased after being placed in the air for 10 days.Compared with other room-temperature magnets reported in the same system, the remarkable characteristic is that the ferrimagnetic long- Spin-glass coexistence, spin-glass behavior is confirmed by the frequency-dependent AC susceptibility.