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Powder X-ray diffraction shows that on sublimation, solvent free C70 crystallizes in a hexagonal close packed (HCP1) arrangement with small admixture of a second hexagonal close placked (HCP2) phase as well as a face centred cubic (FCC) phase, the proportions of which are progressively transformed by annealing in vacuo at 300 °C via HCP2 to FCC.
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Green et al. (1992) studied this question.
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