Abstract
A new synthetic route is developed to prepare a hydroxide precursor for the superconductor YBa 2Cu 3O 7−δ. In an inert atmosphere and at low temperature the yttrium, barium and copper hydroxides are co-precipitated by adding the metal perchlorates and sodium hydroxide together. The analysis of the precursor proved the absence of ClO 4 − and Na + ions. The thermal treatment (12 h calcinating at 950°C, 36 h sintering at 950°C and 6 h annealing at 400°C) gives a superconductor YBa 2Cu 3O 7−δ with a transition temperature of 90.2 K.
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