Abstract
Raman scattering experiments have been carried out on sintered pellets of YBa2Cu3 16O7−x and YBa2Cu3 18O7−x obtained both by gas exchange and by growth with substituted oxides. The frequencies of the modes at 340, 435 and 502 cm−1, which involve motion of the oxygen atoms and which shift significantly upon oxygen isotope substitution, have been measured for several sets of samples. The measured frequency shifts indicate that the isotope exchange on the O(2) and O(3) sites is more complete than the exchange on the O(4) site. The 502 cm−1 line of the18O samples is observed to be broadened and this is attributed to18O-16O disorder on the O(4) sites. The results are discussed with reference to previous measurements of site activation energies and models for the exchange mechanism.
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