Possibility of sulphur-oxygen substitution in YBa2Cu3O6+xSy analyzed by means of X-ray emission spectroscopy

Abstract The analysis of substitution effects upon doping of YBa 2 Cu 3 O 6+x S y by sulphur is given on the basis of investigation of SKα 1,2 and SKs 1 x-ray emission spectra. It is found that sulphur can enter the lattice of YBa 2 Cu 3 O 7 and substitute oxygen atoms. With increasing sulphur concentration from y>0.5 to 2.0 S atoms form isolated sulphate groups which do not have a long order but can be detected by x-ray emission spectroscopy.