块体无限层镍酸盐中氢的分解研究
Investigation of hydrogen incorporations in bulk infinite-layer nickelates
摘要：
无限层（IL）镍酸盐是一类新兴的超导体，其中正方形平面NiO $_2$配位中的Ni $^{1+}$价态只能通过钙钛矿相的拓扑还原来实现。然而，这种含氢试剂的拓扑软化学仍处于快速发展阶段，并且存在许多开放问题，特别是考虑到氢掺入的可能性。在这里，我们研究的时间依赖性的拓扑变换的LaNiO $_3$的LaNiO $_2$粉末样品与X射线衍射和气体萃取技术。虽然粉末的氢含量随时间增加，但中子衍射显示LaNiO $_2$晶格中没有氢的负散射。多余的氢似乎被限制在晶界或第二相沉淀物。因此，初级LaNiO $_2$相的平均晶体结构以及可能的物理性质不受由拓扑异构转变产生的氢残留物的显著影响。
英文摘要：
Infinite-layer (IL) nickelates are an emerging class of superconductors, where the Ni$^{1+}$ valence state in a square planar NiO$_2$ coordination can only be reached via topotactic reduction of the perovskite phase. However, this topotactic soft chemistry with hydrogenous reagents is still at a stage of rapid development, and there is a number of open issues, especially considering the possibility of hydrogen incorporation. Here we study the time dependence of the topotactic transformation of LaNiO$_3$ to LaNiO$_2$ for powder samples with x-ray diffraction and gas extraction techniques. While the hydrogen content of the powder increases with time, neutron diffraction shows no negative scattering of hydrogen in the LaNiO$_2$ crystal lattice. The extra hydrogen appears to be confined to grain boundaries or secondary-phase precipitates. The average crystal structure, and possibly also the physical properties, of the primary LaNiO$_2$ phase are therefore not noticeably affected by hydrogen residues created by the topotactic transformation.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
