Abstract
YBa 2Cu 4O 8 (124) powder has been synthesized by two different methods at 1 ∗ 10 5 Pa oxygen pressure: (i) Solid state reaction of fine powdered YBa 2Cu 3O 7−δ (123) and copper oxide; (ii) A procedure using precursors of variable particle size in the μm range and uniform particle shape. The preparation of the stoichiometric precursor mixtures is carried out by a thermal decomposition of triethylene glycol complexes of yttrium, barium and copper in solution. The correlation between preparation conditions, microstructure and physical properties of such synthesized samples is discussed. Starting from the YBa 2Cu 4O 8 material, the influence of fine dispersed CuO within the YBa 2Cu 3O 7−δ grains which are formed as a result of the thermal conversion of YBa 2Cu 4O 8 according to YBa 2Cu 4O 8 → YBa 2Cu 3O 7−δ + CuO (T > 880°C) on the critical current density J c,mag (intragrain) of YBa 2Cu 3O 7− δ is investigated.
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