Magnetic properties and crystal structure of solvent-free Sc@C82 metallofullerene microcrystals.
Magnetic properties and crystal structure of solvent-free Sc@C82 metallofullerene microcrystals.
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DOI：
10.1002/cphc.200700097
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发表时间：
2007-05
期刊：
影响因子：
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通讯作者：
Yasuhiro Ito;W. Fujita;T. Okazaki;T. Sugai;K. Awaga;E. Nishibori;M. Takata;M. Sakata;H. Shinohara
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文献类型：
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作者：
Yasuhiro Ito;W. Fujita;T. Okazaki;T. Sugai;K. Awaga;E. Nishibori;M. Takata;M. Sakata;H. Shinohara
利用SQUID和X射线粉末衍射研究了内生Sc@C82无溶剂晶体的磁性。我们发现，晶体是一个顺磁体和磁化率从150 K的缓慢冷却的反铁磁类相互作用的证据下降。X射线晶体分析表明，在150 K，这是由于富勒烯分子的取向有序转变的相变的存在下。在低温下，我们发现一个磁亚稳态，可以通过冷却速率控制。亚稳态可以通过快速冷却形成。在亚稳态下，晶体中Sc@C82分子轴的方向是无序的，磁化率比低温缓冷时的磁化率高。
Magnetic properties of solvent-free crystals of the endohedral Sc@C82 are investigated by SQUID and X-ray powder diffraction. We find that the crystal is a paramagnet and the magnetic susceptibility decreases from 150 K with evidence of antiferromagnetic-like interactions by slow cooling. X-ray crystal analysis reveals the presence of a phase transition at 150 K, which is attributed to an orientational ordering transition of the fullerene molecules. At low temperatures we find a magnetic metastable state that can be controlled by the cooling rate. The metastable state can be formed by rapid cooling. The direction of Sc@C82 molecular axis in the crystals is disordered in the metastable state, and the susceptibility is higher than that in the slow cooling case at low temperature.