- P-ISSN 1225-0163
- E-ISSN 2288-8985
<TEX>$Bi_2Sr_2Ca_2Cu_3Oy$</TEX>-based superconductor phases were synthesized by the wet process using acetate precursors. Superconducting transition temperature (<TEX>$T_c$</TEX>) was determined from both measurements of electrical resistivity and magnetic susceptibility for the samples which were sintered at the temperatures of <TEX>$850^{\circ}C$</TEX>, <TEX>$860^{\circ}C$</TEX>, and <TEX>$870^{\circ}C$</TEX> for 40 hours, respectively. The values of carrier concentration from Hall measurements were compared with <TEX>$T_c$</TEX> data as a function of the sintering temperature. The formation mechanism of the superconducting phase was tentatively discussed on a basis of the distribution profile concept of the carrier concentration and the amount of superconducting phases in a ceramic bulk. This explanation may be supported by the experimental results of correlation between the relative amount of superconducting phases and the difference of <TEX>$T_c$</TEX> values between superconducting onset temperature and cutoff temperature at each sintering temperature.