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Abstract:
We report on ultrasonic investigations of the frequency dependent and temperature dependent sound velocity in pure C60 and in C60/C70-compounds. For both compositions of pressed bulk samples used here elastic anomalies owing to the wellknown transitions at about 260 K and 160 K are observed. Concerning the absolute values of the elastic stiffness our results differ markedly from those found by means of low frequency vibrating reed techniques on C60 single crystals.