The influence of oxidative and nonsxidative chlorination on the chemical and superconducting properties of (Si, Pb),Sr,Ca,Gu,O, is studied on samples with different initial 0 content. Owing to oxidative chlorination of Odeficient phases a significant increase of T. is observed although insulating, hygroscopic halide phases are formed and indications for the incorporation of Ci into the structure are not found. Obviously, reactive 0 is formed during degradation of the 2223 phase on the solid-gas phase boundary. The released 0 partially occupies anion vacancies in the unreacted Odeficient mateiial resulting in improved intragranuiar superconducting behaviour. The reaction pathways of the heterogeneous solid-gas reaction are discussed on t h e basis of the results of chemical analysis.
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