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We have successfully synthesized polycrystalline bulk samples of La2CuO4 with the Nd2CuO4-type (T′) structure at low temperatures. First of all, La2CuO4 with the K2NiF4-type (T) structure was prepared by the conventional solid-state reaction. Secondly, La2CuO3.5+δ with the Sr2CuO3-type structure was obtained by heating mixed powder of T-La2CuO4 and CaH2 at 175°C in an evacuated Pyrex tube. Thirdly,...