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钾掺杂4-苄基联苯分子晶体的合成与磁性研究
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Abstract:
本文使用恒温超声处理和低温退火两步法合成了钾掺杂4-苄基联苯分子晶体，并对其磁学特性进行了研究。磁化强度–磁场曲线的测试结果表明样品在低于200 K的温度条件下表现铁磁性，磁化率测试和X射线衍射测试则表明样品是一种纳米磁体材料，晶粒尺寸约为25 nm。拉曼光谱的红移现象证实了钾将4s电子转移到4-苄基联苯分子上，而且电荷的转移是形成局域磁矩的重要原因。本工作对于碱金属掺杂有机芳香烃分子的合成制备以及磁性研究具有重要的借鉴作用。
In this work, potassium-doped 4-Benzylbiphenyl molecular crystal is successfully synthesized by using a two-step synthesis method—ultrasound treatment and low temperature annealing, then the magnetic properties of synthesized materials are studied. The magnetic measurements reveal that the synthesized materials exhibit a ferromagnetism at temperatures below 200 K. The combination of magnetic susceptibility and XRD measurements identifies that the doped samples consist of magnetic nanoparticles with a size about 25 nm. The redshift in the measured Raman spectrum indicates the transfer of K-4s electron to 4-Benzylbiphenyl molecule, which also plays a major role in the formation of local magnetic moment. This study is useful for the synthesis of alkali-metal-doped organic molecular crystals and for understanding their magnetic properties.
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