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• W2059906844 abstract "We have investigated the absorption of interstitial O and the formation of O vacancies in La2CuO4+δ in equilibrium with O2 pressures between 10−4 and 103 Torr or in vacuum at high temperature. Below 600°C, the concentration of vacancies is negligible, and the equilibrium between La2CuO4+δ and gaseous O2 only involves interstitial O. The pressure–composition equilibrium curve has been determined at 550°C by repeated vacuum extraction in a fixed volume. The analysis of the partial desorption stages indicates the formation of interstitial O2− ions (δ∼p1/6) with corrections due to the formation of peroxide species, like pairs of O ions with ionization number −2 (δ∼p1/3) or −3 instead of −4. An equilibrium fraction of O vacancies up to 8% can be created above 720°C in a pressure lower than 0.1 Torr, and reversibly filled by reoxygenation at high temperature, without decomposition of the sample. The vacancies are much less mobile than interstitial O and therefore they must be in the CuO2 plane; they can be frozen in the sample and coexist with interstitial O." @default.
• W2059906844 created "2016-06-24" @default.
• W2059906844 creator A5034782722 @default.
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• W2059906844 date "1999-02-01" @default.
• W2059906844 modified "2023-10-14" @default.
• W2059906844 title "Interstitial O and O vacancies in La2CuO4+δ during high-temperature treatments" @default.
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• W2059906844 doi "https://doi.org/10.1016/s0921-4534(98)00712-6" @default.
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