Abstract
Abstract Gas chromatography/mass spectrometry was used to analyze the oxygen evolved from Ba 0.6 K 0.4 BiO 3 , LaCuO 3 and La 1.85 Sr 0.15 CuO 4 upon dissolution in normal and 18 O-enriched acid. From the 18 O/ 16 O ratio we show that the oxide phases are the principal source of evolved oxygen in the copper-containing materials, while more than half of the oxygen is evolved from the solution with Ba 0.6 K 0.4 BiO 3 . The difference may be due to the location of the holes, which appear to be predominantly on the oxygens in the copper-based materials and on the Bi(Bi V) in Ba 0.6 K 0.4 BiO 3 .
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