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首页> 外文期刊>Physica, C. Superconductivity and its applications >Effect of fluorination on the structure and properties of Hg-based superconducting Cu mixed oxides
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Effect of fluorination on the structure and properties of Hg-based superconducting Cu mixed oxides

机译：氟化对Hg基超导Cu复合氧化物结构和性能的影响

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HgBa2CuO4+delta (Hg-1201) and HgBa2Ca2Cu3O8+delta (Bg-1223) were successfully fluorinated by XeF2. Fluorination of the reduced Hg-1201 phase causes the increase of T-c up to 97 K which is close to that for the optimally doped oxygenated sample. Neutron powder refinements performed on HgBa2CuO4Fdelta samples showed that the exchange of extra oxygen for a double amount of fluorine results in shortening of the apical Cu-O bonds while in-plane ones (as well as T-c) do not vary. On the contrary fluorination of Hg-1223 resulted in T-c enhancement up to 138 K while oxygenated sample exhibited lower T-c = 134 K. From X-ray and neutron powder diffraction study we suppose that the structural factor responsible for the enhancement of T-c in fluorinated Hg-1223 is shortening of the in-plane Cu-O distances with (CuO2) layers remaining practically flat. [References: 5]
机译：HgBa2CuO4 +δ（Hg-1201）和HgBa2Ca2Cu3O8 +δ（Bg-1223）被XeF2成功氟化。还原的Hg-1201相的氟化导致T-c升高至97 K，这与最佳掺杂的含氧样品的T-c接近。在HgBa2CuO4Fdelta样品上进行的中子粉末精炼显示，多余的氧气交换成双倍的氟会导致顶部的Cu-O键缩短，而面内的Cu-O键（以及T-c）则没有变化。相反，Hg-1223的氟化导致Tc增强至138 K，而含氧样品的Tc降低至134K。通过X射线和中子粉末衍射研究，我们推测氟化Hg的Tc增强的结构因素-1223缩短了面内Cu-O距离，而（CuO2）层几乎保持平坦。 [参考：5]

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