期刊
CHEMISTRY OF MATERIALS
卷 16, 期 8, 页码 1456-1465出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm034802f
关键词
-
The structure of the NASICON-like phase Li2.5V2(PO4)(3) has been determined by X-ray and neutron powder diffraction,. demonstrating that it crystallizes in the space group P2(1)/n (a = 8.5539(4) Angstrom; b = 8.6099(4) Angstrom; c = 11.9825(5) Angstrom; beta = 90.002(7)degrees). Combined studies using Li-6,Li-7 MAS NMR, EPR, and ac impedance spectroscopy show that this pseudo-orthorhombic lattice represents a room-temperature analogue of the high-temperature orthorhombic phase gamma-Li3SC2(PO4)(3). Lithium disorder over partially vacant sites leads to enhanced ion mobility. EPR spectroscopy confirms the presence of localized V4+ in the lattice, whose short-range order with V3+ gives rise to five resolvable Li shifts in the Li-6,Li-7 MAS NMR spectrum. These shifts can be rationalized by consideration of the Fermi-contact interactions arising from the difference between V3+ and V4+ coupling in the three lithium sites.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据