Abstract
We have performed ultrasonic pulse-echo experiments to measure the longitudinal and transverse acoustic velocities in nine single-crystal manufactured diamonds. Small (4-5%) but distinct decreases in both the longitudinal and transverse [100] velocities were observed as the 13C content varied from 0% to 99%. The measurements indicated that within our uncertainty (typically l0.5%), c11 was constant with 13C content. However, a 2% decrease in C44 was observed. Velocities in [111]-oriented samples remained nearly constant with isotope content. The implications of this result are discussed in terms of the effective elastic constants 1/3(c11 +2c12+4c44) and 1/3(c11-2c12 +4c44) cubic constants c11, c12, and c44
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