Change of the HTSC Harmonic Susceptibility Properties with Electrlytic Hydrogen Loading Using Different Aqueous Solution as LiOH and NaOH

The higher harmonics magnetic susceptibilities (? = ? i '+i ? i ") of HTSC hydrogen loaded as function of the temperature at 6G of ac magnetic field amplitude at 107Hz of frequency have been measured. The samples have been loaded by electrolysis in an aqueous solution using ?s current pulses at room temperature. The HTSC electrodes have been polarized by short pulse width (1?s) and high peak current (?4A) with a low duty-cycle (10-3) and a variable repetition rate (1-5KHz). The hydrogen influence on HTSC (Tc, ac losses) has been measured and the increasing of the superconducting properties, particularly Tc and Jc, have been found. These effects appear strongly dependent to the loading process and to the stoichiometric ratio H/YBCO. It has been demonstrated that the electrolyte (Li, Na) do not affect the YBCO superconducting properties.