普鲁士蓝
磁铁
居里温度
钒
过渡金属
材料科学
磁化率
无定形固体
磁性
铬
铁磁性
化学物理
凝聚态物理
结晶学
铁磁性
纳米技术
磁化
化学
无机化学
磁场
物理
有机化学
冶金
物理化学
电化学
催化作用
量子力学
电极
作者
Sylvie Ferlay,Talal Mallah,R. Ouahès,P. Veillet,Michel Verdaguer
出处
期刊:Nature
[Springer Nature]
日期:1995-12-01
卷期号:378 (6558): 701-703
被引量:1515
摘要
THE rational design of molecular compounds that exhibit spontaneous magnetic ordering might enable one to tailor magnetic properties for specific applications in magnetic memory devices1–4. In such materials synthesized previously5–17, however, the underlying weak magnetic interactions are incapable of maintaining ordering at ambient temperatures. One remarkable exception is a compound derived from vanadium and tetracyanoethylene18, but the material is amorphous and fragile, and consequently the molecular interactions responsible for its striking properties are not understood. Here we demonstrate another route to the synthesis of a room-temperature organometallic magnet, in which we combine a hexa-cyanometalate [M(CN)6]q− with a Lewis acid Lp+ If L and M are transition-metal ions, then the orbital interactions in the resulting compound can be described by well understood principles21–24, and it is therefore possible to choose the metals to tune the compound's magnetic properties–in particular, the magnetic ordering (Curie) temperature Tc (refs 21–26). We have synthesized a room-temperature magnetic material (TC = 315 K) that belongs to the Prussian blue family of compounds27 (where M is chromium and L is vanadium), demonstrating that transition-metal hexacyano complexes are promising components for the construction of molecule-based high-Tc magnets.
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