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The preferential site for oxygen isotope exchange was investigated on layered films of La 2−x Sr x CoO 4 ͑x = 0.5,1.0͒/La 0.6 Sr 0.4 CoO 3 prepared by pulsed laser deposition ͑PLD͒ on a polycrystalline Ce 0.9 Gd 0.1 O 1.95 . An isotope exchange experiment was performed at 773 K in 18 O-enriched oxygen of 0.2 ϫ 10 5 Pa. Three-dimensional imaging of secondary ion mass spectrometry ͑SIMS͒ was carried out to visualize the isotope distribution. The SIMS images suggested that there are fast oxygenincorporation paths along the hetero-phase interface of La 2−x Sr x CoO 4 /La 0.6 Sr 0.4 CoO 3 . The results have reproduced our former findings on the fast oxygen surface exchange with La 2−x Sr x CoO 4 /La 0.6 Sr 0.4 CoO 3 composite polycrystals.

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