Structure and superconductivity in YBa2Cu3Oy with additives of NaNO3 and NaCl

YBa2Cu3Oy. (YBCO) cuprates with the additives of NaNO3 and NaCl were synthe sized by the standard solid-state reaction technique. For the samples with addition of NaNO3, the superconducting transition temperature T-c0 remains almost unchanged although the lattice constants of the unit cell decrease m onotonically with an increase in the additive of NaNO3. The superconducting transition temperature T-c0 for NaCl doping in YBCO, on the other hand, de creases with an increase in the content of NaCl. The lattice constants of a , b, and c increase slightly for NaCl doping in YBCO. We compared these res ults with that of the KNO3 added in YBCO and believe that the effects of la ttice strain and chlorine replacing for Ba on superconductivity and structu re should be considered in these system. (C) 2000 Elsevier Science B.V. All rights reserved.