This paper describes the Gdx−2BaxCu2x−2Oδ (x = 6, 7) cuprate system synthesis using the conventional solid-state reaction method. Rietveld analysis of X-ray patterns evidences that samples crystallize in Pmm2 (#25) space group at room temperature with lattice parameter a = 3.8807 A, b = 3.8735 A, c = 38.7094 A for Gd4Ba6Cu10Oδ and a = 3.8680 A, b = 3.8763 A, c = 46.5065 for Gd5Ba7Cu12Oδ. Resistivity measurements evidence zero-resistance state, which is a typical behavior of superconducting materials at bulk critical temperature of 15.5 K for Gd4Ba6Cu10Oδ and 22.1 K for Gd5Ba7Cu12Oδ.

中文翻译：

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新型 Gd4-6-10 和 Gd5-7-12 铜酸盐超导体

本文描述了使用常规固态反应方法合成 Gdx−2BaxCu2x−2Oδ (x = 6, 7) 铜酸盐系统。X 射线模式的 Rietveld 分析表明，样品在室温下在 Pmm2 (#25) 空间群中结晶，晶格参数 a = 3.8807 A、b = 3.8735 A、c = 38.7094 A（对于 Gd4Ba6Cu10Oδ 和 a = 3.8680 A、b = 3.876）。 A，对于 Gd5Ba7Cu12Oδ，c = 46.5065。电阻率测量表明零电阻状态，这是超导材料在 Gd4Ba6Cu10Oδ 的体临界温度为 15.5 K 和 Gd5Ba7Cu12Oδ 的体临界温度为 22.1 K 时的典型行为。