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化学学报
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化学学报 ›› 2000, Vol. 58 ›› Issue (12): 1666-1669. 上一篇    下一篇

研究论文

纳米晶室温分子磁体K~0~.~4~5V~1~.~1~2^ⅡV~0~.~1~9^Ⅲ [Cr(CN)~6](SO~4) ~0~.~1~3·4.34H~2O: 亚铁磁长程有序与 自旋玻璃态共存

高松;白欧;易涛;李俊然   

  1. 北京大学稀土材料化学及应用国家重点实验室.北京;北京大学-香港大 学稀土材料和生物无机化学联合实验室
  • 发布日期:2000-12-15

A nano-crystalline room-temperature molecular magnet K~0~.~4~5V~1~. ~1~2^ⅡV~0~.~1~9^Ⅲ [Cr(CN)~6](SO~4)~0~.~1~3·4.34H~2O: Coexistence of long range ferrimagnetic ordering and spin glas behavior

Gao Song;Bai Ou;Yi Tao;Li Junran   

  1. .
  • Published:2000-12-15

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被引次数

3

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~.~4~5V~1~.~1~2^ⅡV~0~.~1~9^Ⅲ[Cr(CN)~6](SO~4)~0~.~1~3·4.34H~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340K，矫顽力H~C在40～310K范围基本保持在5～6Oe，1.83K时增至120Oe。化合物具有较好的空气稳定性，空气中放置10d后T~C仍为340，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。

关键词: 纳米相材料, 磁体, 钒络合物, 铬络合物, 磁性, Ｘ射线衍射分析, 磁化强度

A nano-crystalline Prussian blue like room-temperature molecule- based magnet K~0~.~4~5V~1~.~1~2^ⅡV~0~.~1~9^Ⅲ [Cr(CN)~6](SO~4)~0~. ~1~3·4.34H~2O was synthesized by slow reaction of VSO~4·2.5H~2O and K~3[Cr(CN)~6]·2.5H~2O in aqueous solution under anaerobic conditions. Its XRD pattern can be indexed to face-centered cubic (fcc) unit cell with a=1.178 nm. The widths of the diffraction peaks show that the average size is 5 nm. The magnetic ordering temperature (T~C) of the magnet is 340 k, the coercive filed H~C keeps 5～6 Oe in the range of 40～310 K, and increases to 120 Oe at 1.83 K. It is relative stable to air convinced by the second magnetic measurement results (T~C=340 k, H~C=146 Oe at 5 K) after the sample was stood in air for 10 days. Compared with the reported high T~C V－Cr－CN magnets, the remarkable observation is that the long range ferrimagnetic ordering and spin glass behavior are coexistence in the system, the latter was confirmed by frequency dependent AC magnetic susceptibility.

Key words: NANOPHASE MATERIALS, MAGNET, VANADIUM COMPLEX, CHROMIUM COMPLEX, MAGNETISM, X-RAY DIFFRACTION ANALYSIS, MAGNETIZATION

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