Abstract
In order to elucidate the formation processes of empty and endohedral fullerenes, we produced fullerenes and endohedral fullerenes by changing La concentration as well as furnace temperature. The yields of these products were systematically investigated by ultraviolet-visible (UV-VIS) absorption spectroscopy and electron spin resonance (ESR) and high-performance liquid chromotography (HPLC) analyses. As a result, it was found that the C60 yield decreases monotonically when La concentration increases, while the LaC82 yield shows a maximum at 0.25 atom %, and then decreases monotonically by increasing La concentration as like as C60. From the HPLC analysis it was also found that the yield of higher fullerenes decreases more rapidly because of the presence of La.
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