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New powder synthesis Methods have been developed for preparing the single-phase T12CaBa2Cu2O8 (the 2122 coapound) and T12CaBa2Cu3O10 (the 2223 coapound) powders froa stoichioaetric reactant mixtures. The 2122 coapound was prepared froa a stoichioaetric Mixture of T12O3, CuO, and CaBa2CuO4, while the 2223 coapound was prepared froa the same aixture but with additional CaO and CuO to Batch the correct (T1:Ca:Ba:Cu=2:2:2:3) stoichioaetry. The single-phase 2122 saaples with Tc above 110 K were obtained by using one-step calcination at 830°C, while the 2223 saaples with Tc ranging between 115 and 120 K were obtained by employing a first calcination at 830°C for 5 hrs and a second calcination at 870°C. Powder aelting, which is strongly associated with the conventional aethods, was significantly suppressed in the new aethods.
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