Elastic properties of ultrahard fullerites |
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| Authors: | V D Blank V M Levin V M Prokhorov S G Buga G A Dubitskii N R Serebryanaya |
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| Institution: | (1) Research Center for Superhard Materials, Ministry of Science and Technology of the Russian Federation, 142092 Troitsk, Moscow Region, Russia;(2) Institute of Spectroscopy, Russian Academy of Sciences, 142092 Troitsk, Moscow Region, Russia;(3) Center of Acoustic Microscopy, Institute of Biochemical Physics, Russian Academy of Sciences, 117334 Moscow, Russia;(4) Research Center for Superhard Materials, Ministry of Science and Technology of the Russian Federation, 142092 Troitsk, Moscow Region, Russia;(5) Institute of Spectroscopy, Russian Academy of Sciences, 142092 Troitsk, Moscow Region, Russia |
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| Abstract: | The elastic properties of C60 fullerite samples synthesized under pressure P=13.0 GPa at high temperatures were investigated using acoustic microscopy. The velocities of longitudinal (c
L=17–26 km/s) and transverse (c
T=7.2–9.6 km/s) elastic waves in the samples were measured. It was established that the longitudinal sound velocity of ultrahard
fullerites is higher than that of any other known solid. The bulk modulus of these ultrahard samples is higher than that of
diamond and reaches a value greater than 1 TPa. The high bulk modulus, the relatively large shear moduli, and the substantial
Poisson ratio indicate that the structure of the ultrahard fullerites is fundamentally different from that of diamond.
Zh. éksp. Teor. Fiz. 114, 1365–1374 (October 1998) |
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