Abstract
The present article summarizes progress in research on silicon clusters with encapsulated metal atoms, and specifically focuses on the recent identification of magnetic silicon fullerenes. Considering that C\(_{20}\) forms the smallest known fullerene, the Si\(_{20}\) cluster is of particular interest in this context. While the pure hollow Si\(_{20}\) cage is unstable due to the lack of \(sp^2\) hybridization, endohedral doping with a range of metal atoms has been considered to be an effective way to stabilize the cage structure. In order to seek out suitable embedded atoms for stabilizing Si\(_{20}\), a broad search has been made across elements with relatively large atomic radius. The rare earth elements have been found to be able to stabilize the Si\(_{20}\) cage in the neutral state by forming R@Si\(_{20}\) fullerene cages. Among these atoms, Eu@Si\(_{20}\) has been reported to yield a stable magnetic silicon fullerene. The central europium atom has a large magnetic moment of nearly 7.0 Bohr magnetons. In addition, based on a stable Eu\(_2\)Si\(_{30}\) tube, a magnetic silicon nanotube has been constructed and discussed. These magnetic silicon fullerenes and nanotubes may have potential applications in the fields of spintronics and high-density magnetic storage.
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Acknowledgments
The authors thank Dr. N. E. Davison for his help with the language. This work is supported by the National Natural Science Foundation of China (Grant Nos. 11274089, U1331116 and 11304076), the Natural Science Foundation of Hebei Province (Grant Nos. A2012205066 and A2015205179), the Science Foundation of Hebei Education Award for Distinguished Young Scholars (Grant No. YQ2013008), and the Program for High-level Talents of Hebei Province (Grant No. A201500118). We also acknowledge partial financial support from the 973 Project in China under Grant No. 2011CB606401.
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Wang, J., Liu, Y. Magnetic Silicon Fullerenes: Experimental Exploration and Theoretical Insight. J Clust Sci 27, 861–873 (2016). https://doi.org/10.1007/s10876-015-0959-6
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DOI: https://doi.org/10.1007/s10876-015-0959-6