Fast lithium ion diffusion in the ternary layered nitridometalate LiNiN.
Fast lithium ion diffusion in the ternary layered nitridometalate LiNiN.
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DOI：
10.1021/ja039603b
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发表时间：
2004-03
影响因子：
15
通讯作者：
Z. Stoeva;Ruben Gomez;Alexandra G. Gordon;M. Allan;D. Gregory;G. Hix;J. Titman
中科院分区：
文献类型：
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作者：
Z. Stoeva;Ruben Gomez;Alexandra G. Gordon;M. Allan;D. Gregory;G. Hix;J. Titman
通过粉末 X 射线衍射、7Li 固态 NMR 和 SQUID 磁力测定法研究了层状氮化镍酸盐 (II) LiNiN 的结构、Li+ 扩散动力学和磁性能，并与 Li+ 快离子导体 Li3N 进行了比较和对比。 Ni2+ 取代 Li+ 并同时产生 Li+ 空位，对离子扩散和电子性能产生深远影响。氮化镍酸盐与其二元母体类似，表现出快速的 Li+ 离子扩散，但相比之下，扩散过程仅局限于 Li-N 平面。此外，用 Ni 取代 Li 会导致从半导体行为向金属行为的转变，这可能是通过产生共价增加的无限一维 Ni-N 链来介导的。
The structure, Li+ diffusion dynamics, and magnetic properties of the layered nitridonickelate(II), LiNiN, have been investigated by powder X-ray diffraction, 7Li solid-state NMR, and SQUID magnetometry and compared and contrasted with those of the Li+ fast ion conductor, Li3N. The replacement of Li+ by Ni2+ with concomitant generation of Li+ vacancies has profound effects on ionic diffusion and electronic properties. The nitridonickelate, akin to its binary parent, displays rapid Li+ ion diffusion but, by contrast, the diffusion process is confined only to the Li-N planes. Further, replacement of Li by Ni leads to a transition from semiconducting to metallic behavior, likely mediated through the creation of infinite, 1D Ni-N chains of increased covalency.