THE FIRST STEP ON THE SYNTHESIS ROUTE TO BI AND HG SUPERCONDUCTORS

The properties of high-T-c superconducting cuprates significantly depe nd among others on the stoichiometry which has been often influenced b y the vaporization of the components during the heat treatment. An enh ancement of the homogeneity and a decrease of the particle size of the components might results not only in lowering of the sintering temper ature and shortening of the sintering time but also in the improvement of electrical and magnetic properties. In the present work we have st udied the influence of the different methods of pulverization on the p article size and homogeneity. The reagent powder was ground in the pla netary ball mill, vibrational mill and by the dispersion method. The s mallest size of particles (1.3 mu m) was achieved by using the vibrati onal mill.