HEAT TREATMENT EFFECTS ON POSITRON DOPPLER BROADENING IN YBa₂Cu₃O_7-x

Positron annihilation Doppler lineshape parameters for YBa₂Cu₃O_7-x have been demonstrated experimentally to be sensitive to heat treatment conditions and to vary almost linearly with oxygen vacancy concentration. positron annihilation spectroscopy (PAS) can be used to monitor the beheviors of oxygen vacancies in YBaCuO-like ceramic.