Abstract
ABSTRACTA two-stage pressure-and-temperature treatment of the C60 and C70 fullerites was carried out. C60 and C70 molecules collapsed at the first-stage hot-isostatic-pressing (HIP; 220 MPa, argon) and transformed into some fullerene-related form in the 900–1750°C temperature range. These materials were used at the second stage of the high-pressure-high-temperature (HPHT; 7.7 GPa/1400°C) treatment to produce the bulk samples that had: a specific weight of about 2.0 g/cm3, 40/110 GPa Young modulus, 6.0/12.5 GPa, and elastic recovery above 81%. Transformations under the treatments were investigated with the X-ray and transmission electron microscopy techniques. The mechanism of the pressure-and-temperature transformations is discussed.
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