Abstract
Terrestrial development of the experiments on the fullerite C60 crystal growth in microgravity
Highlights
To investigate the electron–electron correlation and polaron effects caused by the small conduction band the perfect fullerite C60 crystals with sufficiently large overall dimensions are required
The fullerite C60 crystals grown in the first experiments in microgravity aboard the FOTON-M3 spacecraft [4] had more perfect crystal structure in comparison with the crystals grown on the Earth: microgravity creates favorable conditions to reduce the dislocations density and grain boundaries in the growing crystals due to absence of close contact with the ampoule walls and absence of plastic deformation of the crystal under its own weight
For further improvement of the technology before the scheduled space experiments on the ISS, the growing of the high purity grade fullerite C60 crystals with the sufficiently high structural perfection were performed on the Earth from the C60 vapor in sealed quartz ampoules at temperatures in the evaporation zone ranging from 560 – 610 ◦C with the temperature gradient between the evaporation and deposition zones of 3 – 10 K/cm within 72 h
Summary
To investigate the electron–electron correlation and polaron effects caused by the small conduction band (width of 0.05 eV) the perfect fullerite C60 crystals with sufficiently large overall dimensions (about several millimeters) are required. The continuous growth of fullerite C60 crystals by physical vapor transport has been described by the various authors [1,2,3]. The fullerite C60 crystals grown in the first experiments in microgravity aboard the FOTON-M3 spacecraft [4] had more perfect crystal structure in comparison with the crystals grown on the Earth: microgravity creates favorable conditions to reduce the dislocations density and grain boundaries in the growing crystals due to absence of close contact with the ampoule walls and absence of plastic deformation of the crystal under its own weight
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