Abstract
A scanning acoustic microscope is used to study the distribution of elastic properties in small samples (∅ 3×2 mm 3) of new hard phases of C 60. The specimens under investigation were synthesized from pure C 60 powder under pressure P=8 GPa in the temperature range 500–1650 K. The time-of-flight mode was used for bulk sound wave velocity determination in a direction parallel to the cylinder's axis. Longitudinal sound wave velocities greater than 10 000 m/s were found for all specimens treated at temperatures higher than 1000 K. Using the B-scan mode allowed us to observe the velocity gradient in the sample's periphery. The heterogeneous internal structure of the specimen is visualized in the images formed in C- and B-scan modes.
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