Abstract
YBa 2Cu 4O 8 single phase bulk superconducting ceramics was successfully synthesized using the new suggested method of hot pressing (HP) at 750°C and 500 kg/cm 2 in air atmosphere during 25–50 h from a precursor mixture, consisting of Y 2O 3, Ba 2Cu 3O 5 and CuO, obtained by spray drying and thermodecomposition of nitrate solution. Our method allows one to combine in one stage the synthesis of pure phase YBa 2Cu 4O 8 with the production of bulk superconducting ceramics with a stable and reproducible T c=82 − 78 K. The cell parameters with estimated standard deviations were calculated from XRD data: a=3.841 (1) A ̊ , b=3.879 (1) Å; and c=27.258 (6) A ̊ . AC susceptibility measurements were carried out. Transport current density measurements on bulk samples are in progress now. The method can be used in the large scale production of HTSC- ceramics YBa 2Cu 4O 8.
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