Abstract
Abstract Oxygen nonstoichiometry of the electron-doped superconductor Nd1.85Ce0.15CuO4−δ and nondoped Nd2CuO4−δ was determined using thermogravimetry and chemical titration analysis. The oxygen deficiency of Nd2CuO4−δ at 900°C and PO2=10-3 atm was approximately 0.04, while that of Nd1.85Ce0.15CuO4−δ was about 0.008, both being substantially smaller than that of Ba2YCu3O7−δ. In this system, however, a small amount of oxygen defect seems to play an essential role in the manifestations of superconductivity.
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