酸化物超伝導体の合成と特性  NdO1.5‐SrO‐CuO系の平衡状態図

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  • Phase diagram of the NdO1.5-SrO-CuO system.
  • NdO1.5 SrO CuOケイ ノ ヘイコウ ジョウタイズ

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Subsolidus phase diagram of the NdO1.5-SrO-CuO system was studied at 980°C and 1080°C in Air. One ternary compound Sr1.08Nd1.92Cu2O6-δ, and three solid solutions exist; Sr14-xNdxCu24O41+δ, (0 ?? x ?? 6.0 at 980°C), Sr2-xNd1+xCu2O5.5+δ(0.05 ?? x ?? 0.20 at 980°C; 0.05 ?? x ?? 0.35 at 1080°C), and Sr2-xNdxCuO3+δ (x=2/3 at 980°C; 0.5 ?? x ?? 0.95 at 1080°C).Sr2-xNdxCuO3+δ which crystallizes in the oxygen deficient K2NiF4 structure shows a unique modulated structure, The origin of the modulated structure is suggested to be a large lattice mismatch between the (Sr, Nd)2O2 and the CuO1+δ layer.

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