Investigation of the relation between microstructural parameters and magnetic properties of KClO3-doped YBCO superconductors.

The influence of KClO3 addition on the microstructure and magnetic properti es of YBCO were investigated. The AC complex susceptibility chi AC = chi' - i chi " was recorded as a function of temperature and concentration of KCl O3 addition at various AC magnetic fields up to 2 mT. DC magnetization as f unction of temperature was measured by means of a SQUID magnetometer in fie ld-cooled cooling and field-cooled warming (FCW) modes in magnetic fields i n the range 0 less than or equal to mu H-0(a) less than or equal to 7 T.